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Property and Equipment (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Property and Equipment    
Property and equipment, at cost $ 3,188,753,000 $ 3,168,088,000
Less: accumulated depreciation (625,692,000) (600,555,000)
Property and equipment, net 2,563,061,000 2,567,533,000
Other accrued liabilities 3,300,000 8,600,000
Land [Member]
    
Property and Equipment    
Property and equipment, at cost 394,957,000 394,957,000
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 2,324,241,000 2,321,666,000
Furniture, fixtures, and equipment [Member]
    
Property and Equipment    
Property and equipment, at cost 452,167,000 420,367,000
CIP and corporate office equipment [Member]
    
Property and Equipment    
Property and equipment, at cost $ 9,394,000 $ 23,104,000