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Investments In Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Assets |  | $ 7,198,952 |  | $ 6,748,504 |  |
Liabilities |  | 3,682,365 |  | 3,046,780 |  |
Stockholders' Equity Attributable to Parent |  | 3,444,905 |  | 3,628,685 |  |
Gain On Sale Of Joint Venture Operating Property Net Of Tax |  | 0 |  | 19,800 | [1] | $ 0
Net income |  | 128,579 |  | 224,270 |  | 160,694
Income (Loss) from Equity Method Investments | [2] | 8,052 | [3] | 14,783 |  | 7,800
Gain On Sale Of Joint Venture Operating Property Net Of Tax |  | 0 |  | 19,800 | [1] | 0
Net income |  | 128,579 |  | 224,270 |  | 160,694
Equity in income of joint ventures | [2] | 8,052 | [3] | 14,783 |  | 7,800
Assets |  | 7,198,952 |  | 6,748,504 |  |
Liabilities |  | 3,682,365 |  | 3,046,780 |  |
Stockholders' Equity Attributable to Parent |  | 3,444,905 |  | 3,628,685 |  |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Assets |  | 691,500 |  | 685,000 |  |
Liabilities |  | 509,100 |  | 496,900 |  |
Stockholders' Equity Attributable to Parent |  | 149,100 |  | 153,400 |  |
Revenues |  | 128,500 | [4] | 131,700 |  | 127,400
Net income |  | 15,800 |  | 37,500 |  | 16,400
Net income |  | 15,800 |  | 37,500 |  | 16,400
Assets |  | 691,500 |  | 685,000 |  |
Liabilities |  | 509,100 |  | 496,900 |  |
Stockholders' Equity Attributable to Parent |  | 149,100 |  | 153,400 |  |
Revenues |  | $ 128,500 | [4] | $ 131,700 |  | $ 127,400
[1] | In December 2019, one of the funds sold one operating property comprised of 270 apartment homes for approximately $38.5 million.
[2] | Equity in income excludes our ownership interest of fee income from various services provided by us to the Funds.
[3] | Equity in income for the year ended December 31, 2020 includes our ownership interest of the Resident Relief Funds payments of approximately $0.4 million. Equity in income for the year ended December 31, 2019 includes our ownership interest of the gain on sale of the operating property of approximately $6.2 million.
[4] | Total revenues for the year ended December 31, 2020 includes approximately $1.3 million of Resident Relief Funds payments which was recorded as a reduction to property revenues.

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