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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Real Estate and Equipment      
Balance at the beginning of the period $ 4,721,591 $ 3,761,712 $ 3,317,983
Additions 466,155 989,637 452,381
Disposals (846) (27,540) (2,687)
Impairment (3,593) (2,218) (5,965)
Balance at the end of the period 5,183,307 4,721,591 3,761,712
Accumulated Depreciation      
Balance at the beginning of the period 630,261 538,872 454,317
Additions 121,172 101,272 85,788
Disposals (8) (9,655) (1,233)
Impairment (522) (228)  
Balance at the end of the period $ 750,903 $ 630,261 $ 538,872