Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 300	$ 900	$ 800	$ 2,100
related party payment for terminal purchase	0	4,875	0	4,875
Related Party
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	265	799	813	1,884
Terminal Facilities
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	500	1,000	1,100	2,100
Terminal Facilities | Related Party
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 466	$ 963	$ 900	$ 1,919