Business Segments - Summary of Information for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Summary information for the reportable segments
Total revenues	$ 178,333	$ 181,643	$ 354,746	$ 367,686
Property operating expenses	64,758	63,959	129,375	129,921
Other operating expenses not allocated to segments	83,527	90,671	166,097	181,097
Total operating expenses	148,285	154,630	295,472	311,018
Proportionate property net operating income (loss)	30,048	27,013	59,274	56,668
Other items included in income before income tax expense (benefit)	(51,770)	12,282	11,199	(13,775)
Income (loss) from continuing operations before income tax (expense) benefit and discontinued operations	(21,722)	39,295	70,473	42,893
Real Estate [Member]
Summary information for the reportable segments
Property operating expenses	64,758	63,959	129,375	129,921
Segment Reconciling Items [Member]
Summary information for the reportable segments
Total revenues	20,172	6,985	40,190	13,960
Other operating expenses not allocated to segments	0	0	0	0
Total operating expenses	10,822	6,510	21,381	12,984
Proportionate property net operating income (loss)	9,350	475	18,809	976
Other items included in income before income tax expense (benefit)	0	0	0	0
Income (loss) from continuing operations before income tax (expense) benefit and discontinued operations	9,350	475	(18,809)	976
Segment Reconciling Items [Member] | Real Estate [Member]
Summary information for the reportable segments
Property operating expenses	10,822	6,510	21,381	12,984
Corporate Non-Segment [Member]
Summary information for the reportable segments
Total revenues	1,612	2,751	3,299	3,348
Other operating expenses not allocated to segments	83,527	90,671	166,097	181,097
Total operating expenses	90,975	100,578	182,439	203,350
Proportionate property net operating income (loss)	(89,363)	(97,827)	(179,140)	(200,002)
Other items included in income before income tax expense (benefit)	(51,770)	12,282	11,199	(13,775)
Income (loss) from continuing operations before income tax (expense) benefit and discontinued operations	(141,133)	(85,545)	(167,941)	(213,777)
Corporate Non-Segment [Member] | Real Estate [Member]
Summary information for the reportable segments
Property operating expenses	7,448	9,907	16,342	22,253
Same Store [Member] | Operating Segments [Member]
Summary information for the reportable segments
Total revenues	154,154	170,392	307,151	347,148
Other operating expenses not allocated to segments	0	0	0	0
Total operating expenses	45,133	46,398	89,082	92,383
Proportionate property net operating income (loss)	109,021	123,994	218,069	254,765
Other items included in income before income tax expense (benefit)	0	0	0	0
Income (loss) from continuing operations before income tax (expense) benefit and discontinued operations	109,021	123,994	218,069	254,765
Same Store [Member] | Operating Segments [Member] | Real Estate [Member]
Summary information for the reportable segments
Property operating expenses	45,133	46,398	89,082	92,383
Other Real Estate [Member] | Operating Segments [Member]
Summary information for the reportable segments
Total revenues	2,395	1,515	4,106	3,230
Other operating expenses not allocated to segments	0	0	0	0
Total operating expenses	1,355	1,144	2,570	2,301
Proportionate property net operating income (loss)	1,040	371	1,536	929
Other items included in income before income tax expense (benefit)	0	0	0	0
Income (loss) from continuing operations before income tax (expense) benefit and discontinued operations	1,040	371	1,536	929
Other Real Estate [Member] | Operating Segments [Member] | Real Estate [Member]
Summary information for the reportable segments
Property operating expenses	$ 1,355	$ 1,144	$ 2,570	$ 2,301