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Investments In Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Sale of two operating properties within the funds in 2014 [Member] | Sep. 30, 2013 Sale of two operating properties within the funds in 2014 [Member] | Sep. 30, 2014 Sale of two operating properties within the funds in 2014 [Member] | Sep. 30, 2013 Sale of two operating properties within the funds in 2014 [Member] | Sep. 30, 2013 Sale of 2 operating properties within an unconsolidated joint ventures in December 2013 [Member] [Domain] | Sep. 30, 2013 Sale of 2 operating properties within an unconsolidated joint ventures in December 2013 [Member] [Domain] | Dec. 31, 2013 Sale of 2 operating properties within an unconsolidated joint ventures in December 2013 [Member] [Domain] | Sep. 30, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member] | Dec. 31, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]
Investments In Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 747,900,000 |  |  |  | $ 747,900,000 |  |  |  | $ 790,200,000 |  |  |  |  |  |  |  |  |
Total third-party debt | 524,500,000 |  |  |  | 524,500,000 |  |  |  | 530,700,000 |  |  |  |  |  |  |  |  |
Total equity | 196,800,000 |  |  |  | 196,800,000 |  |  |  | 229,600,000 |  |  |  |  |  |  |  |  |
Total revenues (1) | 27,300,000 | [1] | 23,800,000 | [1] | 78,300,000 | [1] | 69,100,000 | [1] |  |  |  |  |  |  |  |  |  |
Gain on sale of operating properties, net of tax | 0 |  | 0 |  | 18,500,000 |  | 95,400,000 |  |  |  |  |  |  |  |  |  |  |
Net income | 2,200,000 |  | 2,200,000 |  | 23,800,000 |  | 102,200,000 |  |  |  |  |  |  |  |  |  |  |
Equity in income (2) | 863,000 | [2] | 1,926,000 | [2] | 5,889,000 | [2] | 20,658,000 | [2] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from discontinued operations attributable to unconsolidated joint venture |  |  |  |  |  |  |  |  |  |  | $ 1,900,000 | $ 1,100,000 | $ 5,500,000 | $ 2,000,000 | $ 5,900,000 |  | $ 10,300,000 |
Number of operating properties sold |  |  |  |  | 0 |  |  |  | 12 | 2 |  |  |  |  |  | 2 |  | 14
[1] | Excludes approximately $1.9 million for the three months ended September 30, 2013, and approximately $1.1 million and $5.5 million for the nine months ended September 30, 2014 and 2013, respectively, related to the sale of two operating properties by the funds during the first quarter of 2014. Additionally, excludes approximately $2.0 million and $5.9 million for the three and nine months ended September 30, 2013, related to the sale of two operating properties within one of our unconsolidated joint ventures in December 2013 and approximately $10.3 million for the nine months ended September 30, 2013 relating to the discontinued operations from the sale of 14 operating properties within one of our unconsolidated joint ventures in May 2013.
[2] | Equity in income excludes our ownership interest of fee income from various services provided by us to the funds.

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