Accounting Policies (Details)
$ / shares in Units, $ in Thousands |
3 Months Ended |
12 Months Ended |
|
|
|
Dec. 31, 2018
USD ($)
Days
$ / shares
|
Sep. 30, 2018
USD ($)
$ / shares
|
Jun. 30, 2018
USD ($)
$ / shares
|
Mar. 31, 2018
USD ($)
$ / shares
|
Dec. 31, 2017
USD ($)
$ / shares
|
Sep. 30, 2017
USD ($)
$ / shares
|
Jun. 30, 2017
USD ($)
$ / shares
|
Mar. 31, 2017
USD ($)
$ / shares
|
Dec. 31, 2018
USD ($)
Days
$ / shares
|
Dec. 31, 2017
USD ($)
$ / shares
|
Dec. 31, 2016
USD ($)
$ / shares
|
Jan. 01, 2019
USD ($)
|
Dec. 31, 2015
USD ($)
|
| Accounting Policies [Line Items] |
|
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| Operating revenue |
$ 356,561
|
$ 331,375
|
$ 330,343
|
$ 302,608
|
$ 325,136
|
$ 298,289
|
$ 283,876
|
$ 262,046
|
$ 1,320,886
|
$ 1,169,346
|
$ 1,030,210
|
|
|
| Accounts Receivable, Net, Current |
$ 156,359
|
|
|
|
147,948
|
|
|
|
$ 156,359
|
147,948
|
|
|
|
| Number of principal reporting segments |
|
|
|
|
|
|
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|
4
|
|
|
|
|
| Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |
|
|
|
|
|
|
|
|
$ 881
|
700
|
210
|
|
|
| Amount Reclassified from Current Deferred Tax Asset to Non-current Deferred Tax Liability |
|
|
|
|
|
|
|
|
|
|
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|
$ (558)
|
| Accounting Policies, Use of Estimates [Abstract] |
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|
| Minimum number of days past due for receivable reserve | Days |
90
|
|
|
|
|
|
|
|
90
|
|
|
|
|
| Average monthly revenue adjustments |
|
|
|
|
|
|
|
|
$ 302
|
|
|
|
|
| Average monthly revenue |
|
|
|
|
|
|
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|
$ 110,074
|
|
|
|
|
| Average monthly revenue adjustments as a percentage of monthly revenue |
0.30%
|
|
|
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|
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|
0.30%
|
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| Number of days in revenue adjustment reserve, minimum | Days |
|
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|
35
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|
|
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| Number of days in revenue adjustment reserve, maximum | Days |
|
|
|
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|
85
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|
|
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| Self insurance limit on individual vehicle and general claims |
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|
$ 7,500
|
|
|
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| Insurance Settlements Receivable |
$ 28,520
|
|
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|
8,133
|
|
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|
$ 28,520
|
8,133
|
|
|
|
| Accounting Policies, Cash and Cash Equivalents [Abstract] |
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| Maximum term for liquid investments to be considered cash equivalents, in months |
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3 months
|
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| Accounting Policies, Property and Equipment [Abstract] |
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| Depreciation |
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|
$ 33,044
|
30,862
|
28,088
|
|
|
| Accounting Policies, Software Development [Abstract] |
|
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| Capitalized software development costs |
21,492
|
|
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|
19,567
|
|
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|
21,492
|
19,567
|
|
|
|
| Capitalized computer software, accumulated amortization |
15,611
|
|
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|
13,706
|
|
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|
15,611
|
13,706
|
|
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|
| Capitalized Computer Software, Amortization |
|
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|
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|
|
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|
1,905
|
1,816
|
1,658
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
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|
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| Deferred Tax Liabilities, Net, Noncurrent |
37,174
|
|
|
|
29,080
|
|
|
|
37,174
|
29,080
|
|
|
|
| Retained Earnings (Accumulated Deficit) |
342,663
|
|
|
|
337,058
|
|
|
|
342,663
|
337,058
|
|
|
|
| Costs and Expenses |
|
|
|
|
|
|
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|
1,198,855
|
1,060,589
|
970,507
|
|
|
| Operating Income (Loss) |
35,047
|
29,879
|
32,870
|
24,235
|
27,843
|
27,176
|
29,996
|
23,743
|
122,031
|
108,757
|
59,703
|
|
|
| Income Tax Expense (Benefit) |
|
|
|
|
|
|
|
|
28,195
|
20,282
|
30,605
|
|
|
| Net income (loss) |
$ 27,684
|
$ 22,329
|
$ 24,298
|
$ 17,741
|
$ 34,681
|
$ 18,328
|
$ 19,666
|
$ 14,581
|
$ 92,051
|
$ 87,255
|
$ 27,505
|
|
|
| Diluted net income per share | $ / shares |
$ 0.95
|
$ 0.76
|
$ 0.82
|
$ 0.60
|
$ 1.16
|
$ 0.61
|
$ 0.65
|
$ 0.48
|
$ 3.12
|
$ 2.89
|
$ 0.90
|
|
|
| Self insurance retention liability |
|
|
|
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|
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|
$ 3,000
|
|
|
|
|
| Self-insurance retention Workers' compensation |
|
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|
|
|
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|
$ 350
|
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| Software and Software Development Costs [Member] |
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| Accounting Policies, Property and Equipment [Abstract] |
|
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| Property and equipment, useful life |
|
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5 years
|
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| Capitalized software future estimated amortization expense |
|
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| 2019 |
$ 1,605
|
|
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|
$ 1,605
|
|
|
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|
| 2020 |
1,263
|
|
|
|
|
|
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|
1,263
|
|
|
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|
| 2021 |
932
|
|
|
|
|
|
|
|
932
|
|
|
|
|
| 2022 |
653
|
|
|
|
|
|
|
|
653
|
|
|
|
|
| 2023 |
382
|
|
|
|
|
|
|
|
382
|
|
|
|
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| Total |
$ 4,835
|
|
|
|
|
|
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|
$ 4,835
|
|
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| Stock Option [Member] |
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| Accounting Policies, Share-based Payments [Abstract] |
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| Period from grant date of stock options to expiration (in years) |
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7 years
|
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| Share-based awards, vesting period |
|
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3 years
|
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| Expected dividend yield (in hundredths) |
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|
1.10%
|
1.30%
|
1.00%
|
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| Expected stock price volatility |
|
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24.40%
|
28.50%
|
28.90%
|
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| Weighted average risk-free interest rate |
|
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|
2.70%
|
2.00%
|
1.30%
|
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|
| Expected life of options (in years) |
|
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|
6 years 1 month 11 days
|
5 years 10 months 11 days
|
5 years 9 months 11 days
|
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| Key Employee Performance Share Based Plan [Member] |
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| Accounting Policies, Share-based Payments [Abstract] |
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| Share-based awards, vesting period |
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3 years
|
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| Expected stock price volatility |
|
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|
24.30%
|
24.70%
|
22.30%
|
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| Weighted average risk-free interest rate |
|
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|
2.20%
|
1.40%
|
0.80%
|
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| Employee Stock Purchase Plan [Member] |
|
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| Accounting Policies, Share-based Payments [Abstract] |
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| Percentage of share price for shares issued under the ESPP (in hundredths) |
|
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90.00%
|
|
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|
| Purchase Period for Employee Stock Purchase Plan |
|
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|
6 months
|
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| Number of large lump sum contributions related to ESPP stock purchases |
2
|
|
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2
|
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| Expedited LTL [Member] |
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| Accounting Policies [Line Items] |
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| Operating revenue |
|
|
|
|
|
|
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|
$ 740,332
|
$ 652,304
|
$ 593,472
|
|
|
| Accounting Policies, Use of Estimates [Abstract] |
|
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| Reserve percentage for past due accounts receivable |
50.00%
|
|
|
|
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|
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|
50.00%
|
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|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
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| Operating Income (Loss) |
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|
$ 96,385
|
87,969
|
83,142
|
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|
| Intermodal [Member] |
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| Accounting Policies [Line Items] |
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| Operating revenue |
|
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|
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|
|
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|
$ 200,750
|
154,446
|
105,504
|
|
|
| Accounting Policies, Use of Estimates [Abstract] |
|
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| Reserve percentage for past due accounts receivable |
10.00%
|
|
|
|
|
|
|
|
10.00%
|
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
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|
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| Operating Income (Loss) |
|
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|
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|
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|
$ 23,266
|
12,963
|
11,060
|
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| Self insurance retention liability |
|
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|
50
|
|
|
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| Pool Distribution [Member] |
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| Accounting Policies [Line Items] |
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| Operating revenue |
|
|
|
|
|
|
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|
$ 193,690
|
168,194
|
151,245
|
|
|
| Accounting Policies, Use of Estimates [Abstract] |
|
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| Reserve percentage for past due accounts receivable |
25.00%
|
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|
|
|
|
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|
25.00%
|
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
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|
|
|
|
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|
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| Operating Income (Loss) |
|
|
|
|
|
|
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|
$ 5,870
|
6,378
|
3,633
|
|
|
| Truckload Premium Services [Member] |
|
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| Accounting Policies [Line Items] |
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| Operating revenue |
|
|
|
|
|
|
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|
$ 186,114
|
194,402
|
179,989
|
|
|
| Accounting Policies, Use of Estimates [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
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| Reserve percentage for past due accounts receivable |
50.00%
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
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|
|
|
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| Operating Income (Loss) |
|
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|
|
|
|
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|
$ 5,055
|
3,215
|
(35,409)
|
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|
| Intersegment Eliminations [Member] |
|
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| Accounting Policies, Share-based Payments [Abstract] |
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| Operating Income (Loss) |
|
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|
|
|
|
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|
$ (8,545)
|
(1,768)
|
(2,723)
|
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| Minimum [Member] |
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| Accounting Policies [Line Items] |
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| Operating Lease, Right-of-Use Asset |
|
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|
|
|
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|
$ 130,000
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
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| Operating Lease, Liability |
|
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|
|
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|
|
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|
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|
130,000
|
|
| Minimum [Member] | Building [Member] |
|
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| Accounting Policies, Property and Equipment [Abstract] |
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| Property and equipment, useful life |
|
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|
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|
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|
30 years
|
|
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|
| Minimum [Member] | Equipment [Member] |
|
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| Accounting Policies, Property and Equipment [Abstract] |
|
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|
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| Property and equipment, useful life |
|
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|
|
|
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|
3 years
|
|
|
|
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| Maximum [Member] |
|
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|
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| Accounting Policies [Line Items] |
|
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|
|
|
|
|
|
|
|
|
|
|
| Operating Lease, Right-of-Use Asset |
|
|
|
|
|
|
|
|
|
|
|
150,000
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
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| Operating Lease, Liability |
|
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|
|
|
|
|
|
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|
$ 150,000
|
|
| Maximum [Member] | Building [Member] |
|
|
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|
|
|
|
|
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| Accounting Policies, Property and Equipment [Abstract] |
|
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|
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|
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| Property and equipment, useful life |
|
|
|
|
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|
40 years
|
|
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| Maximum [Member] | Equipment [Member] |
|
|
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| Accounting Policies, Property and Equipment [Abstract] |
|
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|
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|
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| Property and equipment, useful life |
|
|
|
|
|
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|
10 years
|
|
|
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|
| Adjustments for New Accounting Pronouncement [Member] |
|
|
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|
|
|
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| Accounting Policies [Line Items] |
|
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|
|
|
|
|
|
|
|
|
|
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| Operating revenue |
|
|
|
|
|
|
|
|
|
1,169,346
|
1,030,210
|
|
|
| Accounts Receivable, Net, Current |
|
|
|
|
$ 147,948
|
|
|
|
|
147,948
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounts Payable |
|
|
|
|
30,723
|
|
|
|
|
30,723
|
|
|
|
| Deferred Tax Liabilities, Net, Noncurrent |
|
|
|
|
29,080
|
|
|
|
|
29,080
|
|
|
|
| Retained Earnings (Accumulated Deficit) |
|
|
|
|
337,058
|
|
|
|
|
337,058
|
|
|
|
| Costs and Expenses |
|
|
|
|
|
|
|
|
|
1,060,589
|
970,507
|
|
|
| Operating Income (Loss) |
|
|
|
|
|
|
|
|
|
108,757
|
59,703
|
|
|
| Income Tax Expense (Benefit) |
|
|
|
|
|
|
|
|
|
20,282
|
30,605
|
|
|
| Net income (loss) |
|
|
|
|
|
|
|
|
|
$ 87,255
|
$ 27,505
|
|
|
| Diluted net income per share | $ / shares |
|
|
|
|
|
|
|
|
|
$ 2.89
|
$ 0.90
|
|
|
| Adjustments for New Accounting Pronouncement [Member] | Expedited LTL [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
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|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
$ 655,838
|
$ 596,539
|
|
|
| Adjustments for New Accounting Pronouncement [Member] | Intermodal [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
154,684
|
105,664
|
|
|
| Adjustments for New Accounting Pronouncement [Member] | Pool Distribution [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
168,483
|
151,852
|
|
|
| Adjustments for New Accounting Pronouncement [Member] | Truckload Premium Services [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
201,752
|
181,007
|
|
|
| Adjustments for New Accounting Pronouncement [Member] | Intersegment Eliminations [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
(11,411)
|
(4,852)
|
|
|
| Restatement Adjustment [Member] | Adjustments for New Accounting Pronouncement [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
68,530
|
47,680
|
|
|
| Accounts Receivable, Net, Current |
|
|
|
|
4,907
|
|
|
|
|
4,907
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounts Payable |
|
|
|
|
6,019
|
|
|
|
|
6,019
|
|
|
|
| Deferred Tax Liabilities, Net, Noncurrent |
|
|
|
|
(323)
|
|
|
|
|
(323)
|
|
|
|
| Retained Earnings (Accumulated Deficit) |
|
|
|
|
(790)
|
|
|
|
|
(790)
|
|
|
|
| Costs and Expenses |
|
|
|
|
|
|
|
|
|
68,445
|
47,956
|
|
|
| Operating Income (Loss) |
|
|
|
|
|
|
|
|
|
85
|
(276)
|
|
|
| Income Tax Expense (Benefit) |
|
|
|
|
|
|
|
|
|
151
|
(111)
|
|
|
| Net income (loss) |
|
|
|
|
|
|
|
|
|
(66)
|
(165)
|
|
|
| Restatement Adjustment [Member] | Adjustments for New Accounting Pronouncement [Member] | Expedited LTL [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
36,059
|
25,761
|
|
|
| Restatement Adjustment [Member] | Adjustments for New Accounting Pronouncement [Member] | Intermodal [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
5,777
|
1,993
|
|
|
| Restatement Adjustment [Member] | Adjustments for New Accounting Pronouncement [Member] | Pool Distribution [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
4,262
|
3,191
|
|
|
| Restatement Adjustment [Member] | Adjustments for New Accounting Pronouncement [Member] | Truckload Premium Services [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
22,432
|
16,735
|
|
|
| Previously Reported [Member] | Adjustments for New Accounting Pronouncement [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
1,100,816
|
982,530
|
|
|
| Accounts Receivable, Net, Current |
|
|
|
|
143,041
|
|
|
|
|
143,041
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounts Payable |
|
|
|
|
24,704
|
|
|
|
|
24,704
|
|
|
|
| Deferred Tax Liabilities, Net, Noncurrent |
|
|
|
|
29,403
|
|
|
|
|
29,403
|
|
|
|
| Retained Earnings (Accumulated Deficit) |
|
|
|
|
$ 337,848
|
|
|
|
|
337,848
|
|
|
|
| Costs and Expenses |
|
|
|
|
|
|
|
|
|
992,144
|
922,551
|
|
|
| Operating Income (Loss) |
|
|
|
|
|
|
|
|
|
108,672
|
59,979
|
|
|
| Income Tax Expense (Benefit) |
|
|
|
|
|
|
|
|
|
20,131
|
30,716
|
|
|
| Net income (loss) |
|
|
|
|
|
|
|
|
|
$ 87,321
|
$ 27,670
|
|
|
| Diluted net income per share | $ / shares |
|
|
|
|
|
|
|
|
|
$ 2.89
|
$ 0.90
|
|
|
| Previously Reported [Member] | Adjustments for New Accounting Pronouncement [Member] | Expedited LTL [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
$ 619,779
|
$ 570,778
|
|
|
| Previously Reported [Member] | Adjustments for New Accounting Pronouncement [Member] | Intermodal [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
148,907
|
103,671
|
|
|
| Previously Reported [Member] | Adjustments for New Accounting Pronouncement [Member] | Pool Distribution [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
164,221
|
148,661
|
|
|
| Previously Reported [Member] | Adjustments for New Accounting Pronouncement [Member] | Truckload Premium Services [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
179,320
|
164,272
|
|
|
| Previously Reported [Member] | Adjustments for New Accounting Pronouncement [Member] | Intersegment Eliminations [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
|
$ (11,411)
|
$ (4,852)
|
|
|
| Aggregate deductible for claims between $3,000 and $5,000 [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Self insurance retention liability additional deductible |
|
|
|
|
|
|
|
|
$ 6,000
|
|
|
|
|
| Aggregate deductible for claims between $3,000 and $5,000 [Member] | Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Self insurance retention liability additonal deductible applicable range |
|
|
|
|
|
|
|
|
3,000
|
|
|
|
|
| Aggregate deductible for claims between $3,000 and $5,000 [Member] | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Self insurance retention liability additonal deductible applicable range |
|
|
|
|
|
|
|
|
5,000
|
|
|
|
|
| Aggregate deductible for claims between $5,000 and $10,000 [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Self insurance retention liability additional deductible |
|
|
|
|
|
|
|
|
2,500
|
|
|
|
|
| Aggregate deductible for claims between $5,000 and $10,000 [Member] | Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Self insurance retention liability additonal deductible applicable range |
|
|
|
|
|
|
|
|
5,000
|
|
|
|
|
| Aggregate deductible for claims between $5,000 and $10,000 [Member] | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Self insurance retention liability additonal deductible applicable range |
|
|
|
|
|
|
|
|
10,000
|
|
|
|
|
| Truckload Premium Services [Member] | Aggregate deductible for claims between $0 and $5,000 [Member] | Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies, Use of Estimates [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Liability insurance coverage |
|
|
|
|
|
|
|
|
0
|
|
|
|
|
| Truckload Premium Services [Member] | Aggregate deductible for claims between $0 and $5,000 [Member] | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies, Use of Estimates [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Liability insurance coverage |
|
|
|
|
|
|
|
|
5,000
|
|
|
|
|
| State of Ohio [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies, Share-based Payments [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Self-insurance retention Workers' compensation |
|
|
|
|
|
|
|
|
$ 500
|
|
|
|
|