Operating Leases Operating Leases (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2015
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 13,041,000
Operating Leases, Future Minimum Payments, Due in Two Years	9,227,000
Operating Leases, Future Minimum Payments, Due in Three Years	6,268,000
Operating Leases, Future Minimum Payments, Due in Four Years	5,699,000
Operating Leases, Future Minimum Payments, Due Thereafter	10,167,000
Operating Leases, Future Minimum Payments Due	44,402,000
Purchase Options, Land		$ 21,600,000
Related Party [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	1,451,000
Operating Leases, Future Minimum Payments, Due in Two Years	0
Operating Leases, Future Minimum Payments, Due in Three Years	0
Operating Leases, Future Minimum Payments, Due in Four Years	0
Operating Leases, Future Minimum Payments, Due Thereafter	0
Operating Leases, Future Minimum Payments Due	1,451,000
Equipment Leased to Other Party [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	11,590,000
Operating Leases, Future Minimum Payments, Due in Two Years	9,227,000
Operating Leases, Future Minimum Payments, Due in Three Years	6,268,000
Operating Leases, Future Minimum Payments, Due in Four Years	5,699,000
Operating Leases, Future Minimum Payments, Due Thereafter	10,167,000
Terminal Facilities [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due	$ 42,951,000