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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		9 Months Ended
	Feb. 28, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) joint_venture	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]
Net (loss) income allocable to redeemable noncontrolling interests		$ (382)	$ 379			$ (10)	$ 604
Redeemable Noncontrolling Interests
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]
Beginning Balance		45,383	47,426	$ 45,743	$ 72,104	45,743	72,104
Net (loss) income allocable to redeemable noncontrolling interests				(10)	604
Distributions declared to redeemable noncontrolling interests				(2,388)	(2,943)
Liability reclassification due to exercise of redemption option by joint venture partner	$ (22,000)			0	(22,461)
Other, net, including adjustments to redemption value				2,038	122
Ending Balance				45,383	47,426
Total limited partners' interests in Operating Partnership and other redeemable noncontrolling interests balance at September 30		45,383	47,426	$ 45,743	$ 72,104	45,743	72,104
Redeemable Noncontrolling Interests | Partnership Interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]
Ending Balance		45,383	47,426			45,383	47,426
Limited partners' interests in Operating Partnership								$ 35,313	$ 37,356
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 September 30		$ 45,383	$ 47,426			$ 45,383	$ 47,426	$ 45,383	$ 47,426
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

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