Business Segments - Summary of Information for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Summary information for the reportable segments
Total revenues	$ 191,777	$ 178,123	$ 546,523	$ 545,809
Property operating expenses	73,925	65,419	203,300	195,340
Other operating expenses not allocated to segments	90,812	104,432	256,909	285,529
Total operating expenses	164,737	169,851	460,209	480,869
Proportionate property net operating income (loss)	27,040	8,272	86,314	64,940
Other items included in income before income tax expense (benefit)	(16,644)	(35,246)	(5,445)	(49,021)
Income (loss) from continuing operations before income tax (expense) benefit and discontinued operations	10,396	(26,974)	80,869	15,919
Real Estate [Member]
Summary information for the reportable segments
Property operating expenses	73,925	65,419	203,300	195,340
Segment Reconciling Items [Member]
Summary information for the reportable segments
Total revenues	21,647	11,026	61,787	24,986
Other operating expenses not allocated to segments	0	0	0	0
Total operating expenses	11,643	8,311	32,974	21,302
Proportionate property net operating income (loss)	10,004	2,715	28,813	3,684
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	10,004	2,715	(28,813)	3,684
Segment Reconciling Items [Member] | Real Estate [Member]
Summary information for the reportable segments
Property operating expenses	11,643	8,311	32,974	21,302
Corporate Non-Segment [Member]
Summary information for the reportable segments
Total revenues	2,139	2,988	6,795	6,398
Other operating expenses not allocated to segments	90,812	104,432	256,909	285,529
Total operating expenses	105,273	112,566	288,061	316,052
Proportionate property net operating income (loss)	(103,134)	(109,578)	(281,266)	(309,654)
Other items included in income before income tax expense (benefit)	(16,644)	35,246	5,445	(49,021)
Income (loss) from continuing operations before income tax (expense) benefit and discontinued operations	(119,778)	(144,824)	(286,711)	(358,675)
Corporate Non-Segment [Member] | Real Estate [Member]
Summary information for the reportable segments
Property operating expenses	14,461	8,134	31,152	30,523
Same Store [Member] | Operating Segments [Member]
Summary information for the reportable segments
Total revenues	162,535	163,003	469,686	510,151
Other operating expenses not allocated to segments	0	0	0	0
Total operating expenses	44,901	47,732	133,983	140,115
Proportionate property net operating income (loss)	117,634	115,271	335,703	370,036
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	117,634	115,271	335,703	370,036
Same Store [Member] | Operating Segments [Member] | Real Estate [Member]
Summary information for the reportable segments
Property operating expenses	44,901	47,732	133,983	140,115
Other Real Estate [Member] | Operating Segments [Member]
Summary information for the reportable segments
Total revenues	5,456	1,106	8,255	4,274
Other operating expenses not allocated to segments	0	0	0	0
Total operating expenses	2,920	1,242	5,191	3,400
Proportionate property net operating income (loss)	2,536	136	3,064	874
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	2,536	136	3,064	874
Other Real Estate [Member] | Operating Segments [Member] | Real Estate [Member]
Summary information for the reportable segments
Property operating expenses	$ 2,920	$ 1,242	$ 5,191	$ 3,400