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Related Party (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]          
Operating Leases, Rent Expense $ 3,800 $ 0 $ 3,800 $ 800  
Due to Related Parties, Current 100   100   $ 100
Costs and Expenses, Related Party 593 834 1,624 7,553  
Related Party          
Related Party Transaction [Line Items]          
Payments for Tractor Purchase     0 4,300  
Operating Leases, Rent Expense   0 0 813  
Payments for parts and services 172 368 409 1,151  
Terminal Facilities          
Related Party Transaction [Line Items]          
Operating Leases, Rent Expense 1,500 500 2,500 1,600  
Terminal Facilities | Related Party          
Related Party Transaction [Line Items]          
Operating Leases, Rent Expense $ 421 $ 466 1,227 1,397  
Trailers [Member] | Related Party          
Related Party Transaction [Line Items]          
Fair value of revenue equipment traded     $ (12) $ (108)