Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Accrued capital expenditures	$ 5,000	$ 6,200
Property and Equipment
Property and equipment, at cost	3,572,514	3,388,763
Less: accumulated depreciation	(676,131)	(624,370)
Property and equipment, net	2,896,383	2,764,393
Land [Member]
Property and Equipment
Property and equipment, at cost	578,338	508,838
Land improvements [Member]
Property and Equipment
Property and equipment, at cost	7,994	7,994
Buildings [Member]
Property and Equipment
Property and equipment, at cost	2,526,698	2,427,274
Furniture, Fixtures and Equipment [Member]
Property and Equipment
Property and equipment, at cost	450,601	430,873
CIP [Member]
Property and Equipment
Property and equipment, at cost	$ 8,883	$ 13,784