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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Real Estate and Equipment      
Balance at the beginning of the period $ 5,019,615 $ 4,563,782 $ 3,641,483
Additions 245,330 460,272 951,029
Disposals   (846) (27,540)
Impairment (1,320) (3,593) (1,190)
Balance at the end of the period 5,263,625 5,019,615 4,563,782
Accumulated Depreciation      
Balance at the beginning of the period 714,687 598,445 511,225
Additions 126,073 116,772 97,103
Disposals   (8) (9,655)
Impairment   (522) (228)
Balance at the end of the period $ 840,760 $ 714,687 $ 598,445