Business Segments - Summary of Information for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Summary information for the reportable segments
Rental and other property revenues	$ 224,552	$ 230,235
Property operating expenses	75,480	78,959
Other operating expenses not allocated to segments	113,410	109,862
Total operating expenses	188,890	188,821
Proportionate property net operating income (loss)	35,662	41,414
Other items included in income before income tax benefit (expense)	(29,918)	252,862
Income before income tax benefit (expense)	5,744	294,276
Segment Reconciling Items [Member]
Summary information for the reportable segments
Rental and other property revenues	8,812	8,292
Property operating expenses	8,175	7,733
Total operating expenses	8,175	7,733
Proportionate property net operating income (loss)	637	559
Income before income tax benefit (expense)	637	559
Corporate Non-Segment [Member]
Summary information for the reportable segments
Rental and other property revenues	(2,888)	12,295
Property operating expenses	7,261	11,863
Other operating expenses not allocated to segments	113,410	109,862
Total operating expenses	120,671	121,725
Proportionate property net operating income (loss)	(123,559)	(109,430)
Other items included in income before income tax benefit (expense)	(29,918)	252,862
Income before income tax benefit (expense)	(153,477)	143,432
Same Store [Member] | Operating Segments [Member]
Summary information for the reportable segments
Rental and other property revenues	187,956	181,523
Property operating expenses	48,782	48,990
Total operating expenses	48,782	48,990
Proportionate property net operating income (loss)	139,174	132,533
Income before income tax benefit (expense)	139,174	132,533
Redevelopment and Development [Member] | Operating Segments [Member]
Summary information for the reportable segments
Rental and other property revenues	11,913	14,012
Property operating expenses	4,687	5,255
Total operating expenses	4,687	5,255
Proportionate property net operating income (loss)	7,226	8,757
Income before income tax benefit (expense)	7,226	8,757
Acquisition [Member] | Operating Segments [Member]
Summary information for the reportable segments
Rental and other property revenues	884	0
Property operating expenses	401	127
Total operating expenses	401	127
Proportionate property net operating income (loss)	483	(127)
Income before income tax benefit (expense)	483	(127)
Other Real Estate [Member] | Operating Segments [Member]
Summary information for the reportable segments
Rental and other property revenues	17,875	14,113
Property operating expenses	6,174	4,991
Total operating expenses	6,174	4,991
Proportionate property net operating income (loss)	11,701	9,122
Income before income tax benefit (expense)	$ 11,701	$ 9,122