Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Lease income	$ 234,541	$ 272,143	$ 731,630	$ 815,682
Other property income	2,261	2,780	7,001	6,956
Management, transaction, and other fees	6,142	7,353	19,084	21,768
Total revenues	242,944	282,276	757,715	844,406
Operating expenses:
Depreciation and amortization	84,808	91,856	259,161	282,639
Operating and maintenance	41,345	41,695	123,746	125,092
General and administrative	19,582	16,705	54,489	56,722
Real estate taxes	35,938	33,601	108,618	101,263
Other operating expenses	1,208	1,819	5,025	4,486
Total operating expenses	182,881	185,676	551,039	570,202
Other expense (income):
Interest expense, net	40,794	38,253	118,605	113,178
Goodwill impairment			132,128
Provision for impairment of real estate, net of tax		(14)	1,014	12,099
Gain on sale of real estate, net of tax	(3,237)	(887)	(48,690)	(17,819)
Early extinguishment of debt	19,358	1,391	19,358	11,982
Net investment (income) loss	(2,046)	(370)	(1,482)	(3,690)
Total other expense (income)	54,869	38,373	220,933	115,750
Income (loss) from operations before equity in income of investments in real estate partnerships	5,194	58,227	(14,257)	158,454
Equity in income (loss) of investments in real estate partnerships	8,116	(283)	22,358	43,673
Net income	13,310	57,944	8,101	202,127
Noncontrolling interests:
Exchangeable operating partnership units	(57)	(157)	(29)	(456)
Limited partners’ interests in consolidated partnerships	(565)	(822)	(1,670)	(2,532)
Income attributable to noncontrolling interests	(622)	(979)	(1,699)	(2,988)
Net income attributable to common stockholders	$ 12,688	$ 56,965	$ 6,402	$ 199,139
Income per common share - basic	$ 0.07	$ 0.34	$ 0.04	$ 1.19
Income per common share - diluted	$ 0.07	$ 0.34	$ 0.04	$ 1.19
Partnership Interest [Member]
Revenues:
Lease income	$ 234,541	$ 272,143	$ 731,630	$ 815,682
Other property income	2,261	2,780	7,001	6,956
Management, transaction, and other fees	6,142	7,353	19,084	21,768
Total revenues	242,944	282,276	757,715	844,406
Operating expenses:
Depreciation and amortization	84,808	91,856	259,161	282,639
Operating and maintenance	41,345	41,695	123,746	125,092
General and administrative	19,582	16,705	54,489	56,722
Real estate taxes	35,938	33,601	108,618	101,263
Other operating expenses	1,208	1,819	5,025	4,486
Total operating expenses	182,881	185,676	551,039	570,202
Other expense (income):
Interest expense, net	40,794	38,253	118,605	113,178
Goodwill impairment			132,128
Provision for impairment of real estate, net of tax		(14)	1,014	12,099
Gain on sale of real estate, net of tax	(3,237)	(887)	(48,690)	(17,819)
Early extinguishment of debt	19,358	1,391	19,358	11,982
Net investment (income) loss	(2,046)	(370)	(1,482)	(3,690)
Total other expense (income)	54,869	38,373	220,933	115,750
Income (loss) from operations before equity in income of investments in real estate partnerships	5,194	58,227	(14,257)	158,454
Equity in income (loss) of investments in real estate partnerships	8,116	(283)	22,358	43,673
Net income	13,310	57,944	8,101	202,127
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	(565)	(822)	(1,670)	(2,532)
Income attributable to noncontrolling interests	(565)	(822)	(1,670)	(2,532)
Net income attributable to common unit holders	$ 12,745	$ 57,122	$ 6,431	$ 199,595
Income per common unit - basic	$ 0.07	$ 0.34	$ 0.04	$ 1.19
Income per common unit - diluted	$ 0.07	$ 0.34	$ 0.04	$ 1.19