Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Operating Leased Assets [Line Items]
Due to Related Parties, Current	$ 3,200		$ 3,200		$ 100
Operating Leases, Rent Expense	800	$ 2,200	2,700	$ 6,800
Payments for Repurchase of Common Stock			30,858
related party payment for terminal purchase	4,875		4,875	2,825
Due from Related Parties, Current	1,600		1,600		$ 0
Related Party
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	767	1,784	2,651	5,430
Terminal Facilities
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	900	1,000	3,000	3,200
Terminal Facilities | Related Party
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 833	$ 958	$ 2,753	$ 2,975