Real Estate Fund Investments (Income from the Fund and the Co-Investment) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Details Of Income From Real Estate Funds
Loss from real estate fund investments	$ (167)	$ (8,807)
Less (income) loss attributable to noncontrolling interests in consolidated subsidiaries	(6,820)	8,274
Real estate fund investments
Details Of Income From Real Estate Funds
Net investment (loss) income	(267)	2,734
Net unrealized gain on held investments	100	0
New York City real property transfer tax (the Transfer Tax)	0	(10,630)
Net realized loss on exited investments	0	(911)
Loss from real estate fund investments	(167)	(8,807)
Less (income) loss attributable to noncontrolling interests in consolidated subsidiaries	(2,737)	5,369
Loss from real estate fund investments attributable to the Operating Partnership	(2,904)	(3,438)
Less loss attributable to noncontrolling interests in the Operating Partnership	182	212
Less loss attributable to noncontrolling interests in the Operating Partnership	$ (2,722)	$ (3,226)

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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- Definition

Amount of net income (loss) recognized from investments in real estate partnerships and variable interest entities.

+ References

No definition available.

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- Definition

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))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

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- Definition

Amount after tax of income (loss) attributable to nonredeemable noncontrolling shareholder, unit holder, partner, or other equity holder of a joint venture.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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Amount after tax of income (loss) attributable to nonredeemable noncontrolling partner in an operating partnership.

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- Definition

A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843

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- Definition

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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- Definition

This element represents income from the real estate fund net of amounts attributable to noncontrolling interests

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

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