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Related Party (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Related Party Transaction [Line Items]          
Due to Related Parties, Current $ 0   $ 0   $ 100
Operating Leases, Rent Expense 0 $ 800 800 $ 2,800  
related party payment for terminal purchase   4,875 0    
Costs and Expenses, Related Party 834 14,448 7,553 30,880  
Related Party          
Related Party Transaction [Line Items]          
Payments for tractor purchase 0 20,687 4,300 45,582  
Operating Leases, Rent Expense 0 767 813 2,651  
Payments for parts and services 368 1,224 1,151 3,650  
Terminal Facilities          
Related Party Transaction [Line Items]          
Operating Leases, Rent Expense 500 900 1,600 3,000  
Terminal Facilities | Related Party          
Related Party Transaction [Line Items]          
Operating Leases, Rent Expense 466 833 1,397 2,753  
Tractors [Member] | Related Party          
Related Party Transaction [Line Items]          
Receipts for tractor sales 0 (9,035) 0 (28,603)  
Trailers [Member] | Related Party          
Related Party Transaction [Line Items]          
Receipts for tractor sales $ 0 $ (28) $ (108) $ (28)