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Summary Of Significant Accounting Policies (Supplemental Consolidated Statements Of Cash Flows Information) (Details) (USD $) | 12 Months Ended
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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

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