Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Plant and equipment
Property and equipment, net	$ 3,029,375		$ 3,029,375		$ 2,669,732
Increase in property and equipment			359,600
Depreciation expense	66,000	$ 61,400	191,700	$ 190,900
Interest capitalized in connection with major construction projects	0	300	1,800	500
Land and Land Improvements - non-leased
Plant and equipment
Property and equipment	297,580		297,580		42,350
Land and Land Improvements Leased
Plant and equipment
Property and equipment	382,536		382,536		382,702
Building and Building Improvements - non-leased
Plant and equipment
Property and equipment	398,207		398,207		173,043
Buildings and Building Improvements Leased
Plant and equipment
Property and equipment	2,219,018		2,219,018		2,219,018
Furniture, Fixtures and Equipment
Plant and equipment
Property and equipment	1,308,349		1,308,349		1,213,143
Leasehold Improvements
Plant and equipment
Property and equipment	126,442		126,442		120,984
Construction In Progress - non-leased
Plant and equipment
Property and equipment	11,699		11,699		69,367
Non-leased Assets
Plant and equipment
Property and equipment	2,142,277		2,142,277		1,618,887
Less accumulated depreciation	(1,082,611)		(1,082,611)		(988,490)
Property and equipment, net	1,059,666		1,059,666		630,397
Leased Assets
Plant and equipment
Property and equipment	2,601,554		2,601,554		2,601,720
Less accumulated depreciation	(631,845)		(631,845)		(562,385)
Property and equipment, net	1,969,709		1,969,709		$ 2,039,335
Master Lease Agreement
Plant and equipment
Depreciation expense	$ 23,100	$ 22,200	$ 69,500	$ 66,700