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Related Party Transactions and Investments in Non-Consolidated Entities (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2012
entity
Dec. 31, 2011
entity
Dec. 31, 2010
entity
Related Party Transactions and Investments in Non-Consolidated Entities      
Sponsored REITs (in entities) 15 16 15
Balance Sheet Data (unaudited):      
Real Estate, net $ 659,655,000 $ 755,825,000  
Other assets 156,785,000 135,658,000  
Total liabilities (316,311,000) (293,326,000)  
Total stockholders' equity 500,129,000 598,157,000  
Operating Data (unaudited):      
Rental revenues 109,676,000 111,417,000 91,406,000
Other revenues 115,000 90,000 162,000
Operating and maintenance expenses (56,621,000) (55,672,000) (50,339,000)
Selling, general and administrative   (604,000)  
Depreciation and amortization (35,143,000) (33,909,000) (27,138,000)
Interest expense (17,357,000) (17,180,000) (11,160,000)
Gain on sale, less applicable income tax 36,610,000    
Net income 37,280,000 4,142,000 2,931,000
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 30 days    
Asset management fee income from non-consolidated entities $ 1,149,000 $ 958,000 $ 830,000