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Related Party (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]      
Operating Leases, Rent Expense $ 1,800 $ 0  
Due to Related Parties, Current 100   $ 100
Costs and Expenses, Related Party 383 512  
Related Party      
Related Party Transaction [Line Items]      
Payments for parts and services 136 109  
Terminal Facilities      
Related Party Transaction [Line Items]      
Operating Leases, Rent Expense 1,300 500  
Terminal Facilities | Related Party      
Related Party Transaction [Line Items]      
Operating Leases, Rent Expense 247 415  
Trailers [Member] | Related Party      
Related Party Transaction [Line Items]      
Fair value of revenue equipment traded $ 0 $ (12)