Quarterly report pursuant to Section 13 or 15(d)

Recent Accounting Pronouncements (Details)

v3.8.0.1
Recent Accounting Pronouncements (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounts Receivable, Net, Current $ 146,191   $ 147,948
Number of principal reporting segments 4    
Operating revenue $ 302,608 $ 262,046  
Operating Income (Loss) 24,235 23,743  
Income Tax Expense (Benefit) 6,123 8,854  
Net income $ 17,741 $ 14,581  
Diluted (in dollars per share) | $ / shares $ 0.60 $ 0.48  
Accounts Payable $ 30,004   30,723
Deferred income taxes 32,793   29,080
Retained Earnings (Accumulated Deficit) 328,546   337,058
Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounts Receivable, Net, Current     147,948
Operating revenue   $ 262,046  
Operating Expenses   238,303  
Operating Income (Loss)   23,743  
Income Tax Expense (Benefit)   8,854  
Net income   $ 14,581  
Diluted (in dollars per share) | $ / shares   $ 0.48  
Accounts Payable     30,723
Deferred income taxes     29,080
Retained Earnings (Accumulated Deficit)     337,058
Accounting Standards Update 2014-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ 14,203  
Expedited LTL [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue 168,363 148,179  
Operating Income (Loss) 20,773 18,928  
Expedited LTL [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   148,765  
Truckload Premium Services [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   47,088  
Pool Distribution [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue 42,607 38,731  
Operating Income (Loss) 1,371 1,367  
Pool Distribution [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   38,801  
Intermodal [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue 48,477 28,896  
Operating Income (Loss) 3,469 2,555  
Intermodal [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   28,907  
Elimination [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating Income (Loss) $ (1,335) (862)  
Elimination [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   (1,515)  
Scenario, Previously Reported [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounts Receivable, Net, Current     143,041
Operating revenue   246,982  
Operating Expenses   223,793  
Operating Income (Loss)   23,189  
Income Tax Expense (Benefit)   8,638  
Net income   $ 14,243  
Diluted (in dollars per share) | $ / shares   $ 0.47  
Accounts Payable     24,704
Deferred income taxes     29,403
Retained Earnings (Accumulated Deficit)     337,848
Scenario, Previously Reported [Member] | Expedited LTL [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   $ 140,598  
Scenario, Previously Reported [Member] | Truckload Premium Services [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   41,785  
Scenario, Previously Reported [Member] | Pool Distribution [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   37,823  
Scenario, Previously Reported [Member] | Intermodal [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   28,291  
Scenario, Previously Reported [Member] | Elimination [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   (1,515)  
Restatement Adjustment [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounts Receivable, Net, Current     4,907
Operating revenue   15,064  
Operating Expenses   14,510  
Operating Income (Loss)   554  
Income Tax Expense (Benefit)   216  
Net income   $ 338  
Diluted (in dollars per share) | $ / shares   $ 0.01  
Accounts Payable     6,019
Deferred income taxes     (323)
Retained Earnings (Accumulated Deficit)     $ (790)
Restatement Adjustment [Member] | Expedited LTL [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   $ 8,167  
Restatement Adjustment [Member] | Truckload Premium Services [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   5,303  
Restatement Adjustment [Member] | Pool Distribution [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   978  
Restatement Adjustment [Member] | Intermodal [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   616  
Restatement Adjustment [Member] | Elimination [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating revenue   $ 0