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Investments In Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) (USD $)
 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]              
Revenues from discontinued operations attributable to unconsolidated joint venture           $ 7,800,000 $ 49,600,000
Revenues from discontinued operations attributable to unconsolidated joint venture         20,600,000 36,000,000 30,800,000
Total assets 790,200,000 917,800,000     790,200,000 917,800,000  
Total third party debt 530,700,000 712,700,000     530,700,000 712,700,000  
Total equity 229,600,000 165,200,000     229,600,000 165,200,000  
Total revenues         98,600,000 95,900,000 95,900,000 [1]
Gain On Sale Of Operating Properties, Net Of Tax         112,400,000 49,700,000 17,400,000
Net income (loss)         120,700,000 50,500,000 (3,200,000)
Equity in income of joint ventures         24,865,000 20,175,000 5,679,000 [2]
Number of unconsolidated equity method investments acquired   1          
Number of operating properties sold 2   12 2 16 11  
Sale of 7 operating properties within two unconsolidated joint ventures in 2012 [Member]
              
Schedule of Equity Method Investments [Line Items]              
Revenues from discontinued operations attributable to unconsolidated joint venture           23,300,000 26,300,000
Sale of 4 operating properties within one unconsolidated joint venture in 2011 [Member]
              
Schedule of Equity Method Investments [Line Items]              
Revenues from discontinued operations attributable to unconsolidated joint venture             $ 11,400,000
[1] Includes approximately $7.8 million and $49.6 million of revenues for the years ended December 31, 2012 and 2011 related to one previously unconsolidated joint venture acquired by us in December 2012 and 12 previously unconsolidated joint ventures acquired by us in January 2012.
[2] Equity in income excludes our ownership interest of fee income from various property management services provided by us to our joint ventures.