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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      
Beginning balance $ 725,031 $ 615,666 $ 519,460
Acquisitions 166,750 106,135 94,250
Improvements 11,219 3,230 5,941
Conversion of mortgage loans into owned properties   0 2,900
Impairment charges 0    
Cost of real estate sold (2,905)   (6,885)
Ending balance 900,095 725,031 615,666
Accumulated depreciation      
Beginning balance 178,196 158,709 145,180
Depreciation expense 22,002 19,487 16,016
Conversion of mortgage loans into owned properties 0    
Impairment charges 0    
Cost of real estate sold (1,650)   (2,487)
Ending balance $ 198,548 $ 178,196 $ 158,709