Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Plant and equipment
Property and equipment, net	$ 2,774,323		$ 2,820,383
Decrease in property and equipment	46,100
Depreciation expense	65,000	$ 65,600
Interest capitalized in connection with major construction projects	0	0
Master Lease Agreement
Plant and equipment
Depreciation expense	22,700	$ 22,900
Land and improvements - non-leased
Plant and equipment
Property and equipment	294,590		294,590
Land and improvements - master lease
Plant and equipment
Property and equipment	381,680		382,246
Building and improvements - non-leased
Plant and equipment
Property and equipment	404,875		404,158
Buildings and improvements - master lease
Plant and equipment
Property and equipment	2,219,017		2,219,018
Furniture, Fixtures and Equipment
Plant and equipment
Property and equipment	1,358,002		1,355,615
Leasehold Improvements
Plant and equipment
Property and equipment	119,404		118,940
Construction in progress - non-leased
Plant and equipment
Property and equipment	26,903		16,375
Non-leased assets
Plant and equipment
Property and equipment	2,203,774		2,189,678
Less Accumulated depreciation	(1,261,519)		(1,224,596)
Property and equipment, net	942,255		965,082
Master lease assets
Plant and equipment
Property and equipment	2,600,697		2,601,264
Less Accumulated depreciation	(768,629)		(745,963)
Property and equipment, net	$ 1,832,068		$ 1,855,301