Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 113,577	$ 48,864
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	133,986	131,820
Loss on sale of depreciable real estate assets	1	0
Gain on sale of non-depreciable real estate assets	(23)	0
(Gain) loss on embedded derivative in preferred shares	(11,896)	15,108
Stock compensation expense	6,640	5,369
Amortization of debt issuance costs, discounts and premiums	1,510	1,344
Loss (gain) on investments	10,233	(1,622)
Net change in operating accounts and other operating activities	(74,405)	(52,772)
Net cash provided by operating activities	179,623	148,111
Cash flows from investing activities:
Purchases of real estate and other assets	(5,232)	0
Capital improvements and other	(38,212)	(49,220)
Development costs	(42,780)	(64,291)
Distributions from real estate joint venture	95	114
Contributions to affiliates	(7,500)	0
Proceeds from real estate asset dispositions and insurance recoveries	10,097	898
Net cash used in investing activities	(83,532)	(112,499)
Cash flows from financing activities:
Net proceeds from commercial paper	20,000	213,000
Principal payments on notes payable	(343)	(119,154)
Distributions to noncontrolling interests	(3,484)	(4,159)
Dividends paid on common shares	(125,432)	(117,242)
Dividends paid on preferred shares	(922)	(922)
Acquisition of noncontrolling interests	(43,070)	0
Net change in other financing activities	(814)	625
Net cash used in financing activities	(154,065)	(27,852)
Net (decrease) increase in cash, cash equivalents and restricted cash	(57,974)	7,760
Cash, cash equivalents and restricted cash, beginning of period	130,598	35,615
Cash, cash equivalents and restricted cash, end of period	72,624	43,375
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	60,371	32,620
Restricted cash	12,253	10,755
Total cash, cash equivalents and restricted cash	72,624	43,375
Supplemental disclosure of cash flow information:
Interest paid	30,427	26,998
Income taxes paid	0	81
Supplemental disclosure of noncash investing and financing activities:
Conversion of OP Units to shares of common stock	193	232
Accrued construction in progress	38,191	32,781
Interest capitalized	1,836	2,550
Limited Partnership [Member]
Cash flows from operating activities:
Net income	113,577	48,864
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	133,986	131,820
Loss on sale of depreciable real estate assets	1	0
Gain on sale of non-depreciable real estate assets	(23)	0
(Gain) loss on embedded derivative in preferred shares	(11,896)	15,108
Stock compensation expense	6,640	5,369
Amortization of debt issuance costs, discounts and premiums	1,510	1,344
Loss (gain) on investments	10,233	(1,622)
Net change in operating accounts and other operating activities	(74,405)	(52,772)
Net cash provided by operating activities	179,623	148,111
Cash flows from investing activities:
Purchases of real estate and other assets	(5,232)	0
Capital improvements and other	(38,212)	(49,220)
Development costs	(42,780)	(64,291)
Distributions from real estate joint venture	95	114
Contributions to affiliates	(7,500)	0
Proceeds from real estate asset dispositions and insurance recoveries	10,097	898
Net cash used in investing activities	(83,532)	(112,499)
Cash flows from financing activities:
Net proceeds from commercial paper	20,000	213,000
Principal payments on notes payable	(343)	(119,154)
Dividends paid on common shares	(128,916)	(121,401)
Dividends paid on preferred shares	(922)	(922)
Acquisition of noncontrolling interests	(43,070)	0
Net change in other financing activities	(814)	625
Net cash used in financing activities	(154,065)	(27,852)
Net (decrease) increase in cash, cash equivalents and restricted cash	(57,974)	7,760
Cash, cash equivalents and restricted cash, beginning of period	130,598	35,615
Cash, cash equivalents and restricted cash, end of period	72,624	43,375
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	60,371	32,620
Restricted cash	12,253	10,755
Total cash, cash equivalents and restricted cash	72,624	43,375
Supplemental disclosure of cash flow information:
Interest paid	30,427	26,998
Income taxes paid	0	81
Supplemental disclosure of noncash investing and financing activities:
Accrued construction in progress	38,191	32,781
Interest capitalized	$ 1,836	$ 2,550