Business Segments - Summary of Information for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Summary information for the reportable segments
Rental and other property revenues	$ 218,808	$ 224,200	$ 443,360	$ 454,435
Property operating expenses	74,123	75,647	149,603	154,606
Other operating expenses not allocated to segments	112,745	108,449	226,155	218,311
Total operating expenses	186,868	184,096	375,758	372,917
Proportionate property net operating income (loss)	31,940	40,104	67,602	81,518
Other items included in income before income tax benefit (expense)	8,385	28,065	(21,533)	280,927
Income before income tax benefit (expense)	40,325	68,169	46,069	362,445
Segment Reconciling Items [Member]
Summary information for the reportable segments
Rental and other property revenues	8,519	7,905	17,215	16,068
Property operating expenses	7,931	7,378	15,989	14,983
Total operating expenses	7,931	7,378	15,989	14,983
Proportionate property net operating income (loss)	588	527	1,226	1,085
Income before income tax benefit (expense)	588	527	1,226	1,085
Corporate Non-Segment [Member]
Summary information for the reportable segments
Rental and other property revenues	506	6,687	(1,095)	20,262
Property operating expenses	6,075	8,955	13,800	21,312
Other operating expenses not allocated to segments	112,745	108,449	226,155	218,311
Total operating expenses	118,820	117,404	239,955	239,623
Proportionate property net operating income (loss)	(118,314)	(110,717)	(241,050)	(219,361)
Other items included in income before income tax benefit (expense)	8,385	28,065	(21,533)	280,927
Income before income tax benefit (expense)	(109,929)	(82,652)	(262,583)	61,566
Same Store [Member] | Operating Segments [Member]
Summary information for the reportable segments
Rental and other property revenues	180,779	182,816	367,564	363,187
Property operating expenses	48,720	48,893	97,154	97,519
Total operating expenses	48,720	48,893	97,154	97,519
Proportionate property net operating income (loss)	132,059	133,923	270,410	265,668
Income before income tax benefit (expense)	132,059	133,923	270,410	265,668
Redevelopment and Development [Member] | Operating Segments [Member]
Summary information for the reportable segments
Rental and other property revenues	11,589	12,695	23,502	26,708
Property operating expenses	4,912	4,990	9,599	10,245
Total operating expenses	4,912	4,990	9,599	10,245
Proportionate property net operating income (loss)	6,677	7,705	13,903	16,463
Income before income tax benefit (expense)	6,677	7,705	13,903	16,463
Acquisition and Other Real Estate [Member] | Operating Segments [Member]
Summary information for the reportable segments
Rental and other property revenues	17,415	14,097	36,174	28,210
Property operating expenses	6,485	5,431	13,061	10,547
Total operating expenses	6,485	5,431	13,061	10,547
Proportionate property net operating income (loss)	10,930	8,666	23,113	17,663
Income before income tax benefit (expense)	$ 10,930	$ 8,666	$ 23,113	$ 17,663