Property and Equipment (Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 548,661	$ 592,739
Accumulated depreciation and amortization	(214,998)	(231,127)
Property and equipment, net	333,663	361,612
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	71,061	79,412
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	305,277	335,566
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	92,360	96,565
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	70,003	70,370
Assets Under Development [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,960	$ 10,826