Real Estate Fund Investments (Income from the Fund and the Co-Investment) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Details Of Income From Real Estate Funds
Loss (income) from real estate fund investments	$ (226,327)	$ (104,082)	$ (89,231)
Less loss attributable to noncontrolling interests in consolidated subsidiaries	139,894	24,547	53,023
Real estate fund investments
Details Of Income From Real Estate Funds
Net unrealized loss on held investments	(226,107)	(106,109)	(83,794)
Net investment (loss) income	(220)	2,027	6,105
Net realized (loss) gain on exited investments	0	0	(912)
New York City real property transfer tax (the "Transfer Tax")	0	0	(10,630)
Loss (income) from real estate fund investments	(226,327)	(104,082)	(89,231)
Less loss attributable to noncontrolling interests in consolidated subsidiaries	163,213	55,274	61,230
Loss from real estate fund investments net of noncontrolling interests in consolidated subsidiaries	$ (63,114)	$ (48,808)	$ (28,001)

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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Amount of unrealized gain (loss) on investment.

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

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Real Estate Transfer Tax Paid

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