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Related Party Transactions (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
entity
Dec. 31, 2010
entity
Dec. 31, 2009
entity
Related Party Transactions      
Sponsored REITs (in entities) 16 15 14
Fully syndicated (in entities) 16 14 12
Not fully syndicated (in entities)   1 2
Number of REITs in which the entity holds non-controlling preferred stock interest 3    
Operating Data:      
Rental revenues $ 135,391,000 $ 114,638,000 $ 119,341,000
Depreciation and amortization 48,249,000 36,155,000 35,304,000
Interest 12,666,000 7,284,000 6,570,000
Interest income 22,000 25,000 92,000
Sponsored REITs
      
Sponsored REIT      
Management fees eliminated in consolidation 16,000 14,000 2,000
Interest expense eliminated in consolidation 197,000 38,000 6,000
Operating Data:      
Rental revenues 1,482,000 498,000 74,000
Operating and maintenance expenses 480,000 536,000 50,000
Depreciation and amortization 610,000 146,000 6,000
Interest 197,000 38,000 6,000
Interest income   1,000  
Net income (expenses) $ 195,000 $ (221,000) $ 12,000