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Related Party (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]          
Operating Leases, Rent Expense   $ 300   $ 800  
Due to Related Parties, Current $ 100   $ 100   $ 100
Costs and Expenses, Related Party 519 5,277 1,030 6,719  
Related Party          
Related Party Transaction [Line Items]          
Payments for Tractor Purchase 0 4,300 0 4,300  
Operating Leases, Rent Expense 0 265 0 813  
Payments for parts and services 127 246 236 783  
Terminal Facilities          
Related Party Transaction [Line Items]          
Operating Leases, Rent Expense 500 500 1,000 1,100  
Terminal Facilities | Related Party          
Related Party Transaction [Line Items]          
Operating Leases, Rent Expense 392 466 806 931  
Trailers [Member] | Related Party          
Related Party Transaction [Line Items]          
Fair value of revenue equipment traded $ 0 $ 0 $ (12) $ (108)