Related Party (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Operating Leases, Rent Expense		$ 600
Due to Related Parties, Current	$ 100		$ 100
Related Party
Related Party Transaction [Line Items]
Operating Leases, Rent Expense	0	548
Payments for parts and services	109	537
Terminal Facilities
Related Party Transaction [Line Items]
Operating Leases, Rent Expense	500	500
Terminal Facilities | Related Party
Related Party Transaction [Line Items]
Operating Leases, Rent Expense	415	466
Trailers [Member] | Related Party
Related Party Transaction [Line Items]
Fair value of revenue equipment traded	$ (12)	$ (108)