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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Real Estate and Equipment      
Balance at the beginning of the period $ 3,761,712 $ 3,317,983 $ 2,807,256
Additions 989,637 452,381 533,124
Disposals (27,540) (2,687) (6,867)
Impairment (2,218) (5,965) (15,530)
Balance at the end of the period 4,721,591 3,761,712 3,317,983
Accumulated Depreciation      
Balance at the beginning of the period 538,872 454,317 381,339
Additions 101,272 85,788 74,712
Disposals (9,655) (1,233) (1,734)
Impairment (228)    
Balance at the end of the period $ 630,261 $ 538,872 $ 454,317