Annual report pursuant to Section 13 and 15(d)

Segment Reporting (Details)

v3.10.0.1
Segment Reporting (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]                      
Number of principal reporting segments                 4    
External revenues $ 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
Depreciation and amortization                 42,183 41,055 38,210
Share-based Compensation                 10,549 8,103 8,334
Goodwill and Intangible Asset Impairment                 0 0 42,442
Interest expense                 1,783 1,209 1,597
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
Total assets 760,215       692,622       760,215 692,622 644,048
Additions to Other Assets, Amount                 42,293 38,265 42,186
Expedited LTL [Member]                      
Segment Reporting Information [Line Items]                      
External revenues                 740,332 652,304 593,472
Revenue from Related Parties                 7,230 3,534 3,067
Depreciation and amortization                 22,523 22,103 21,919
Share-based Compensation                 7,761 6,776 7,209
Interest expense                 1 3 1,687
Operating Income (Loss)                 96,385 87,969 83,142
Total assets 478,888       440,823       478,888 440,823 443,077
Additions to Other Assets, Amount                 38,520 36,650 37,501
Truckload Premium Services [Member]                      
Segment Reporting Information [Line Items]                      
External revenues                 186,114 194,402 179,989
Revenue from Related Parties                 6,468 7,350 1,018
Depreciation and amortization                 6,429 6,328 6,441
Share-based Compensation                 696 378 332
Goodwill and Intangible Asset Impairment                     42,442
Interest expense                 (21) 2 3
Operating Income (Loss)                 5,055 3,215 (35,409)
Total assets 71,163       65,829       71,163 65,829 53,695
Additions to Other Assets, Amount                 190 33 1,828
Pool Distribution [Member]                      
Segment Reporting Information [Line Items]                      
External revenues                 193,690 168,194 151,245
Revenue from Related Parties                 427 289 607
Depreciation and amortization                 6,900 6,773 5,975
Share-based Compensation                 453 387 334
Operating Income (Loss)                 5,870 6,378 3,633
Total assets 64,306       55,970       64,306 55,970 50,271
Additions to Other Assets, Amount                 2,729 1,068 2,637
Intermodal [Member]                      
Segment Reporting Information [Line Items]                      
External revenues                 200,750 154,446 105,504
Revenue from Related Parties                 256 238 160
Depreciation and amortization                 6,329 5,848 3,876
Share-based Compensation                 984 562 459
Interest expense                 58 48 83
Operating Income (Loss)                 23,266 12,963 11,060
Total assets 167,002       149,150       167,002 149,150 130,295
Additions to Other Assets, Amount                 854 514 220
Business Intersegment, Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from Related Parties                 (14,381) (11,411) (4,852)
Depreciation and amortization                 2 3 (1)
Share-based Compensation                 655    
Interest expense                 1,745 1,156 (176)
Operating Income (Loss)                 (8,545) (1,768) (2,723)
Total assets $ (21,144)       $ (19,150)       $ (21,144) $ (19,150) $ (33,290)