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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION Reconciliation of Accumulated Depreciation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at beginning of year $ 156,117 $ 132,488 $ 109,376
Depreciation related to real estate 24,679 23,629 23,112
Balance at end of year $ 180,796 $ 156,117 $ 132,488