Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Lease income	$ 222,552	$ 266,236	$ 497,089	$ 543,539
Other property income	2,435	2,194	4,740	4,176
Management, transaction, and other fees	6,126	7,442	12,942	14,415
Total revenues	231,113	275,872	514,771	562,130
Operating expenses:
Depreciation and amortization	85,058	93,589	174,353	190,783
Operating and maintenance	40,032	42,759	82,401	83,397
General and administrative	21,202	18,717	34,907	40,017
Real estate taxes	36,793	33,506	72,680	67,661
Other operating expenses	2,480	1,533	3,817	2,667
Total operating expenses	185,565	190,104	368,158	384,525
Other expense (income):
Interest expense, net	40,375	37,173	77,811	74,925
Goodwill impairment	0		132,128	0
Provision for impairment of real estate, net of tax	230	10,441	1,014	12,113
Gain on sale of real estate, net of tax	(7,448)	(442)	(45,453)	(16,932)
Early extinguishment of debt			0	10,591
Net investment (income) loss	(4,359)	(966)	564	(3,320)
Total other expense (income)	28,798	46,206	166,064	77,377
Income (loss) from operations before equity in income of investments in real estate partnerships	16,750	39,562	(19,451)	100,228
Equity in income of investments in real estate partnerships	2,824	13,128	14,242	43,955
Net income (loss)	19,574	52,690	(5,209)	144,183
Noncontrolling interests:
Exchangeable operating partnership units	(87)	(109)	28	(299)
Limited partners’ interests in consolidated partnerships	(441)	(853)	(1,105)	(1,710)
Income attributable to noncontrolling interests	(528)	(962)	(1,077)	(2,009)
Net income (loss) attributable to common stockholders	$ 19,046	$ 51,728	$ (6,286)	$ 142,174
Income (loss) per common share - basic	$ 0.11	$ 0.31	$ (0.04)	$ 0.85
Income (loss) per common share - diluted	$ 0.11	$ 0.31	$ (0.04)	$ 0.85
Partnership Interest [Member]
Revenues:
Lease income	$ 222,552	$ 266,236	$ 497,089	$ 543,539
Other property income	2,435	2,194	4,740	4,176
Management, transaction, and other fees	6,126	7,442	12,942	14,415
Total revenues	231,113	275,872	514,771	562,130
Operating expenses:
Depreciation and amortization	85,058	93,589	174,353	190,783
Operating and maintenance	40,032	42,759	82,401	83,397
General and administrative	21,202	18,717	34,907	40,017
Real estate taxes	36,793	33,506	72,680	67,661
Other operating expenses	2,480	1,533	3,817	2,667
Total operating expenses	185,565	190,104	368,158	384,525
Other expense (income):
Interest expense, net	40,375	37,173	77,811	74,925
Goodwill impairment			132,128	0
Provision for impairment of real estate, net of tax	230	10,441	1,014	12,113
Gain on sale of real estate, net of tax	(7,448)	(442)	(45,453)	(16,932)
Early extinguishment of debt			0	10,591
Net investment (income) loss	(4,359)	(966)	564	(3,320)
Total other expense (income)	28,798	46,206	166,064	77,377
Income (loss) from operations before equity in income of investments in real estate partnerships	16,750	39,562	(19,451)	100,228
Equity in income of investments in real estate partnerships	2,824	13,128	14,242	43,955
Net income (loss)	19,574	52,690	(5,209)	144,183
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	(441)	(853)	(1,105)	(1,710)
Income attributable to noncontrolling interests	$ (441)	$ (853)	$ (1,105)	$ (1,710)
Income (loss) per common unit - basic	$ 0.11	$ 0.31	$ (0.04)	$ 0.85
Net income (loss) attributable to common unit holders	$ 19,133	$ 51,837	$ (6,314)	$ 142,473
Income (loss) per common unit - diluted	$ 0.11	$ 0.31	$ (0.04)	$ 0.85