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Summary Of Significant Accounting Policies (Supplemental Consolidated Statements Of Cash Flows Information) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental disclosure of cash activities:      
Cash paid for interest $ 43,663,000 $ 47,611,000 $ 46,247,000
Supplemental disclosure of non-cash activities:      
Conversion of OP Units into common stock 7,895,000   403,000
Exchange of joint venture interest for 100% interest in unconsolidated joint venture property:      
Real estate and related assets acquired 75,127,000    
Mortgage loans payable assumed (43,112,000)    
Mortgage loans payable assumed by buyers 76,632,000 24,273,000 12,358,000
Mortgage loans payable assumed upon acquisition     (12,967,000)
Acquisition of noncontrolling interests in consolidated joint venture properties 7,595,000    
Disposition of noncontrolling interests in consolidated joint venture properties (36,840,000)    
Capitalization of interest and deferred financing costs 1,314,000 2,629,000 2,541,000
Deconsolidation of properties transferred to joint venture:      
Real estate, net     139,743,000
Mortgage loans payable     (94,018,000)
Other assets/liabilities, net     (3,574,000)
Investment in and advances to unconsolidated joint venture     $ 9,423,000