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Investments In Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investments In Joint Ventures [Abstract]      
Total assets $ 1,394,900,000 $ 935,300,000  
Total third-party debt 1,093,900,000 810,100,000  
Total equity 261,600,000 105,300,000  
Total revenues 164,400,000 137,600,000 137,300,000
Gain on sale of operating properties, net of tax 17,400,000    
Net income (loss) (3,200,000) (19,100,000) (18,000,000)
Equity in income (loss) $ 5,679,000 [1] $ (839,000) [1] $ 695,000 [1]
[1] Equity in income (loss) of unconsolidated joint ventures excludes our ownership interest of fee income from various property management services and interest income from mezzanine loans with our joint ventures.