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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Real Estate      
Beginning balance $ 900,095 $ 725,031 $ 615,666
Acquisitions 19,040 166,750 106,135
Improvements 32,008 11,219 3,230
Cost of real estate sold (13,526) (2,905)  
Ending balance 937,617 900,095 725,031
Accumulated depreciation      
Beginning balance 198,548 178,196 158,709
Depreciation expense 24,568 22,002 19,487
Cost of real estate sold (4,416) (1,650)  
Ending balance $ 218,700 $ 198,548 $ 178,196