Real Estate Fund Investments (Income from the Fund and the Co-Investment) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Details Of Income From Real Estate Funds
Loss (income) from real estate fund investments	$ (104,082)	$ (89,231)	$ 3,240
Less loss (income) attributable to noncontrolling interests in consolidated subsidiaries	24,547	53,023	(25,802)
Real estate fund investments
Details Of Income From Real Estate Funds
Net investment income	2,027	6,105	18,507
Net unrealized loss on held investments	(106,109)	(83,794)	(25,807)
Net realized (loss) gain on exited investments	0	(912)	36,078
Previously recorded unrealized gain on exited investment	0	0	(25,538)
New York City real property transfer tax (the Transfer Tax)	0	(10,630)	0
Loss (income) from real estate fund investments	(104,082)	(89,231)	3,240
Less loss (income) attributable to noncontrolling interests in consolidated subsidiaries	55,274	61,230	(14,044)
Loss from real estate fund investments net of controlling interests in consolidated subsidiaries(2)	$ (48,808)	(28,001)	$ (10,804)
One Park Avenue \| Real estate fund investments
Details Of Income From Real Estate Funds
Loss from real estate fund investments net of controlling interests in consolidated subsidiaries(2)		$ 4,252

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Amount of net income (loss) recognized from investments in real estate partnerships and variable interest entities.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(2))
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Amount after tax of income (loss) attributable to nonredeemable noncontrolling shareholder, unit holder, partner, or other equity holder of a joint venture.

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-Publisher FASB
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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This element represents the income (loss) from the Real Estate Fund before allocation to noncontrolling interests

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This element represents previously recorded unrealized gains on exited investments.

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Real Estate Transfer Tax Paid

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