Related Party (Details) - USD ($) $ in Thousands	2 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Due to Related Parties, Current		$ 100	$ 100
Operating Leases, Rent Expense		3,300	8,300	$ 1,300
Payments to Acquire Property, Plant, and Equipment		217,253	204,973	135,195
Related Party Transaction, Expenses from Transactions with Related Party	$ 7,208	53,039	49,882
Related Party [Member]
Related Party Transaction [Line Items]
Payments for tractor purchase	6,884	58,599	46,562
proceeds from sale of trailers	0	(28)	(103)
proceeds from sale of tractors	(2,138)	(38,064)	(15,564)
Payments for parts and services	1,058	4,346	5,906
Operating Leases, Rent Expense		3,000	6,800	900
Payments to Acquire Property, Plant, and Equipment	0	21,555	2,825
Administrative Services Revenue	(98)	0	(516)
Revenue Equipment [Member] | Related Party [Member]
Related Party Transaction [Line Items]
Operating Leases, Rent Expense	$ 930	3,223	6,842
Terminal Facilities [Member]
Related Party Transaction [Line Items]
Operating Leases, Rent Expense		3,900	4,200	700
Terminal Facilities [Member] | Related Party [Member]
Related Party Transaction [Line Items]
Operating Leases, Rent Expense		3,408	3,930
Related Party Transaction, Expenses from Transactions with Related Party		$ 3,600	$ 3,900	$ 572