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Property and Equipment (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Property and Equipment    
Property and equipment, at cost $ 3,207,378,000 $ 3,131,175,000
Less: accumulated depreciation (599,343,000) (519,721,000)
Property and equipment, net 2,608,035,000 2,611,454,000
Other accrued liabilities 3,900,000 3,000,000
Land [Member]
   
Property and Equipment    
Property and equipment, at cost 402,198,000 402,198,000
Land improvements [Member]
   
Property and Equipment    
Property and equipment, at cost 7,994,000 7,994,000
Buildings [Member]
   
Property and Equipment    
Property and equipment, at cost 2,369,198,000 2,360,648,000
Furniture, fixtures, and equipment [Member]
   
Property and Equipment    
Property and equipment, at cost 407,422,000 340,462,000
CIP and corporate office equipment [Member]
   
Property and Equipment    
Property and equipment, at cost $ 20,566,000 $ 19,873,000