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Number of Joint Ventures in which Units are Issued, Noncontrolling Interest

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Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]

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Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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Amount of noncontrolling interests which are redeemable by the parent entity, classified as other equity.

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As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of preferred shares (regardless of class), preferred partnership units (regardless of class), preferential membership interests, or any other form of preferred equity regardless of investee entity legal form.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Basis of Presentation, Consolidation, Investments in Joint Ventures, and Noncontrolling Interests - Redeemable Noncontrolling Interests (Details) $ in Thousands	1 Months Ended	3 Months Ended				6 Months Ended
	Feb. 28, 2018 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($) joint_venture	Jun. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]
Net income allocable to redeemable noncontrolling interests		$ 99		$ 304		$ 372	$ 225
Redeemable Noncontrolling Interests
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]
Beginning Balance		45,306	$ 45,743	48,120	$ 72,104	45,743	72,104
Net income allocable to redeemable noncontrolling interests			372		225
Distributions declared to redeemable noncontrolling interests			(1,586)		(2,008)
Liability reclassification due to exercise of redemption option by joint venture partner	$ (22,000)		0		(22,461)
Other, net, including adjustments to redemption value			777		260
Ending Balance			45,306		48,120
Total limited partners' interests in Operating Partnership and other redeemable noncontrolling interests balance at June 30		45,306	45,743	48,120	72,104	$ 45,743	$ 72,104	$ 45,306	$ 48,120
Redeemable Noncontrolling Interests \| Partnership Interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]
Beginning Balance		45,306		48,120
Ending Balance			45,306		48,120
Limited partners' interests in Operating Partnership								35,236	38,050
Other redeemable noncontrolling interests in certain subsidiaries								10,070	10,070
Total limited partners' interests in Operating Partnership and other redeemable noncontrolling interests balance at June 30		$ 45,306	$ 45,306	$ 48,120	$ 48,120			$ 45,306	$ 48,120
Capital Unit, Class B
Redeemable Noncontrolling Interest [Line Items]
Number of joint ventures \| joint_venture						3
Number of joint ventures accounted for as noncontrolling interest \| joint_venture						1