Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Lease income	$ 1,113,368	$ 980,166	$ 1,094,301
Other property income	12,456	9,508	9,201
Management, transaction, and other fees	40,337	26,501	29,636
Total revenues	1,166,161	1,016,175	1,133,138
Operating expenses:
Depreciation and amortization	303,331	345,900	374,283
Operating and maintenance	184,553	170,073	169,909
General and administrative	78,218	75,001	74,984
Real estate taxes	142,129	143,004	136,236
Other operating expenses	5,751	12,642	7,814
Total operating expenses	713,982	746,620	763,226
Other expense (income):
Interest expense, net	145,170	156,678	151,264
Goodwill impairment		132,128
Provision for impairment of real estate	84,389	18,536	54,174
Gain on sale of real estate, net of tax	(91,119)	(67,465)	(24,242)
Early extinguishment of debt		21,837	11,982
Net investment income	(5,463)	(5,307)	5,568
Total other expense (income)	132,977	256,407	187,610
Income from operations before equity in income of investments in real estate partnerships	319,202	13,148	182,302
Equity in income of investments in real estate partnerships (note 4)	47,086	34,169	60,956
Net income	366,288	47,317	243,258
Noncontrolling interests:
Exchangeable operating partnership units	(1,615)	(203)	(634)
Limited partners’ interests in consolidated partnerships	(3,262)	(2,225)	(3,194)
Income attributable to noncontrolling interests	(4,877)	(2,428)	(3,828)
Net income attributable to common stockholders	$ 361,411	$ 44,889	$ 239,430
Income per common share - basic (note 15)	$ 2.12	$ 0.27	$ 1.43
Income per common share - diluted (note 15)	$ 2.12	$ 0.26	$ 1.43
Partnership Interest [Member]
Revenues:
Lease income	$ 1,113,368	$ 980,166	$ 1,094,301
Other property income	12,456	9,508	9,201
Management, transaction, and other fees	40,337	26,501	29,636
Total revenues	1,166,161	1,016,175	1,133,138
Operating expenses:
Depreciation and amortization	303,331	345,900	374,283
Operating and maintenance	184,553	170,073	169,909
General and administrative	78,218	75,001	74,984
Real estate taxes	142,129	143,004	136,236
Other operating expenses	5,751	12,642	7,814
Total operating expenses	713,982	746,620	763,226
Other expense (income):
Interest expense, net	145,170	156,678	151,264
Goodwill impairment		132,128
Provision for impairment of real estate	84,389	18,536	54,174
Gain on sale of real estate, net of tax	(91,119)	(67,465)	(24,242)
Early extinguishment of debt		21,837	11,982
Net investment income	(5,463)	(5,307)	(5,568)
Total other expense (income)	132,977	256,407	187,610
Income from operations before equity in income of investments in real estate partnerships	319,202	13,148	182,302
Equity in income of investments in real estate partnerships (note 4)	47,086	34,169	60,956
Net income	366,288	47,317	243,258
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	(3,262)	(2,225)	(3,194)
Income attributable to noncontrolling interests	(3,262)	(2,225)	(3,194)
Net income attributable to common unit holders	$ 363,026	$ 45,092	$ 240,064
Income per common unit - basic (note 15):	$ 2.12	$ 0.27	$ 1.43
Income per common unit - diluted (note 15):	$ 2.12	$ 0.26	$ 1.43