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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION Reconciliation of Real Estate Properties (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at beginning of year $ 1,305,561 $ 1,119,758 $ 1,004,347
Other improvements 60,300 185,803 46,723
Property Acquired 105,884 0 68,688
Balance at end of year $ 1,471,745 $ 1,305,561 $ 1,119,758