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Related Party Transactions (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2011
D
Dec. 31, 2010
Dec. 31, 2009
Balance Sheet Data (unaudited):      
Real estate, net $ 755,825,000 $ 767,938,000  
Other assets 135,658,000 105,218,000  
Total Liabilities (293,326,000) (256,612,000)  
Total stockholders' equity 598,157,000 616,544,000  
Operating Data (unaudited):      
Rental revenues 111,417,000 91,406,000 95,918,000
Other revenues 90,000 162,000 386,000
Operating and maintenance expenses (55,672,000) (50,339,000) (50,080,000)
Selling, general and administrative (604,000)    
Depreciation and amortization (33,909,000) (27,138,000) (24,359,000)
Interest expense (17,180,000) (11,160,000) (9,412,000)
Net income 4,142,000 2,931,000 12,453,000
Asset management fees, low end of range (as a percent) 1.00%    
Asset management fees, high end of range (as a percent) 5.00%    
Notice period for cancellation of applicable contracts (in days) 30    
Asset management fee income from non-consolidated entities $ 958,000 $ 830,000 $ 902,000