Real Estate Fund Investments (Income from the Fund and the Co-Investment) (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
Mar. 01, 2011	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Details Of Income From Real Estate Funds
(Loss) from real estate fund investments		$ (190)	$ (6,308)	$ (37,973)	$ (1,649)
Less (income) loss attributable to noncontrolling interests in consolidated subsidiaries		(3,312)	(4,022)	31,137	(18,436)
Real estate fund investments
Details Of Income From Real Estate Funds
Net investment income		3,093	6,028	6,366	16,888
Net unrealized loss on held investments		(3,283)	(11,220)	(32,796)	(28,860)
Net realized gain (loss) on exited investments		0	35,620	(913)	35,861
Previously recorded unrealized gain on exited investment		0	(36,736)	0	(25,538)
Transfer Tax		0	0	(10,630)	0
(Loss) from real estate fund investments		(190)	(6,308)	(37,973)	(1,649)
Less (income) loss attributable to noncontrolling interests in consolidated subsidiaries		(558)	(1,486)	34,338	(9,684)
(Loss) from real estate fund investments attributable to the Operating Partnership (nine months ended September 30, 2018 includes $4,252 of loss related to One Park Avenue potential additional transfer taxes and reduction in carried interest)		(748)	(7,794)	(3,635)	(11,333)
Less loss attributable to noncontrolling interests in the Operating Partnership		46	485	224	706
Less loss attributable to noncontrolling interests in the Operating Partnership		$ (702)	$ (7,309)	(3,411)	$ (10,627)
One Park Avenue
Details Of Income From Real Estate Funds
Transfer Tax	$ (3,000)			(4,978)
One Park Avenue \| Real estate fund investments
Details Of Income From Real Estate Funds
(Loss) from real estate fund investments attributable to the Operating Partnership (nine months ended September 30, 2018 includes $4,252 of loss related to One Park Avenue potential additional transfer taxes and reduction in carried interest)				$ (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
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 220
-Section S99
-Paragraph 1
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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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Amount after tax of income (loss) attributable to nonredeemable noncontrolling partner in an operating partnership.

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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).

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-Publisher FASB
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-SubTopic 30
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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 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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This element represents previously recorded unrealized gains on exited investments.

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