CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Total revenues	$ 1,632,026	$ 1,040,155	$ 1,117,164
Expenses:
Property operating expenses	1,236,357	489,070	451,581
Depreciation and amortization	270,147	289,025	286,235
General and administrative	30,593	37,028	85,885
Acquisition and certain other transaction related costs	814	13,102	194
Impairment of assets	106,972	115,201	66,346
Costs and Expenses, Total	1,644,883	943,426	890,241
Gain on sale of properties	6,487	39,696	261,916
Dividend income	0	1,846	2,901
Gains and losses on equity securities, net	34,106	(41,898)	(20,724)
Interest and other income	18,221	941	667
Interest expense (including net amortization of debt premiums, discounts and issuance costs of $8,022, $6,032 and $6,221, respectively)	(201,483)	(180,112)	(179,287)
Gain on lease termination	22,896	0	0
Loss on early extinguishment of debt	(427)	(44)	(22)
(Loss) income from continuing operations before income tax expense and equity in earnings of an investee	(133,057)	(82,842)	292,374
Income tax expense	(1,250)	(436)	(476)
Equity in earnings of an investee	0	400	516
Net (loss) income	(134,307)	(82,878)	292,414
Net income attributable to noncontrolling interest	(5,146)	(5,356)	(5,542)
Net (loss) income attributable to common shareholders	(139,453)	(88,234)	286,872
Other comprehensive income (loss):
Amounts reclassified from cumulative other comprehensive income to net income	0	175	0
Equity in unrealized gain (loss) of an investee	0	91	(68)
Other comprehensive income (loss)	0	266	(68)
Comprehensive (loss) income	(134,307)	(82,612)	292,346
Comprehensive income attributable to noncontrolling interest	(5,146)	(5,356)	(5,542)
Comprehensive (loss) income attributable to common shareholders	$ (139,453)	$ (87,968)	$ 286,804
Weighted average shares used in computing earnings per common share:
Weighted average common shares outstanding (basic) (in shares)	237,739	237,604	237,511
Weighted average common shares outstanding (diluted) (in shares)	237,739	237,604	237,546
Per common share amounts (basic and diluted)
Net (loss) income attributable to common shareholders (in dollars per share)	$ (0.59)	$ (0.37)	$ 1.21
Rental income
Revenues:
Total revenues	$ 427,215	$ 606,558	$ 700,641
Residents fees and services
Revenues:
Total revenues	$ 1,204,811	$ 433,597	$ 416,523