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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 | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended
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Apr. 30, 2013 | Jan. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2012 Sale of 7 operating properties within two unconsolidated joint ventures in 2012 [Member] | Dec. 31, 2012 Sale of 7 operating properties within two unconsolidated joint ventures in 2012 [Member] | Jun. 30, 2012 Sale of 7 operating properties within two unconsolidated joint ventures in 2012 [Member] | May 31, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member] | Jun. 30, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member] | Jun. 30, 2012 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member] | Jun. 30, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member] | Jun. 30, 2012 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]
Investments In Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  | $ 828,300,000 | [1] |  |  | $ 828,300,000 | [1] |  |  | $ 917,800,000 | [1] |  |  |  |  |  |  |  |
Total third-party debt |  |  | 555,400,000 |  |  |  | 555,400,000 |  |  |  | 712,700,000 |  |  |  |  |  |  |  |  |
Total equity |  |  | 243,000,000 |  |  |  | 243,000,000 |  |  |  | 165,200,000 |  |  |  |  |  |  |  |  |
Total revenues |  |  | 26,700,000 | [1] | 25,400,000 | [1],[2] | 52,800,000 | [1] | 52,600,000 | [1],[2] |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  | 98,000,000 |  | 0 |  | 100,000,000 |  | (1,700,000) |  |  |  |  |  |  |  |  |  |  |
Equity in income |  |  | 17,798,000 | [3] | 632,000 | [3] | 18,732,000 | [3] | 998,000 | [3] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from discontinued operations attributable to unconsolidated joint venture |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |  | 13,800,000 |  | 3,800,000 | 6,500,000 | 10,300,000 | 13,000,000
Number of operating properties sold | 1 | 1 |  |  |  |  |  |  |  |  | 11 |  |  | 7 |  | 14 |  |  |  |
Revenues prior to sale of operating properties in unconsolidated joint venture |  |  |  |  | $ 1,200,000 |  |  |  | $ 5,300,000 |  |  |  |  |  |  |  |  |  |  |
[1] | (1)Excludes approximately $3.8 million and $10.3 million for the three and six months ended June 30, 2013, respectively, and approximately $6.5 million and $13.0 million for the three and six months ended June 30, 2012, respectively, relating to the discontinued operations from the sale of 14 operating properties within one of our unconsolidated joint ventures during the second quarter of 2013. Additionally, excludes approximately $7.0 million and $13.8 million for the three and six months ended June 30, 2012, respectively, related to the discontinued operations from the sale of seven operating properties within two of our unconsolidated joint ventures during the third and fourth quarters of 2012.
[2] | (2)Includes approximately $1.2 million of revenues for the three months ended June 30, 2012 related to our acquisition of one previously unconsolidated joint venture in December 2012 and approximately $5.3 million of revenues for the six months ended June 30, 2012 related to this joint venture and the acquisition by us of 12 previously unconsolidated joint ventures in January 2012.
[3] | (3)Equity in income excludes our ownership interest of fee income from various property and asset management services provided by us to our joint ventures.

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