Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 600	$ 1,100
Related Party [Member]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	548	1,085
Terminal Facilities
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	500	1,000
Terminal Facilities | Related Party [Member]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 466	$ 956