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Schedule of Operating Lease Rental Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 52,543	$ 55,061	$ 21,759
Space Lease Agreements [Member]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	37,061	40,848	16,032
Related Party Leases [Member]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	2,035	2,429	1,108
Other Operating Leases [Member]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 13,447	$ 11,784	$ 4,619