Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 272,739	$ 115,680
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	263,912	254,105
(Gain) loss on sale of depreciable real estate assets	(134,828)	27
(Gain) loss on sale of non-depreciable real estate assets	(32)	371
Loss on embedded derivative in preferred shares	1,940	15,945
Stock compensation expense	9,212	8,150
Amortization of debt issuance costs, discounts and premiums	2,674	2,290
Net change in operating accounts and other operating activities	(18,299)	(6,953)
Net cash provided by operating activities	397,318	389,615
Cash flows from investing activities:
Purchases of real estate and other assets	(46,028)	(5,004)
Capital improvements, development and other	(247,544)	(191,850)
Distributions from real estate joint venture	392	84
Contributions to affiliates	(1,114)	(1,725)
Proceeds from disposition of real estate assets	161,756	660
Net cash used in investing activities	(132,538)	(197,835)
Cash flows from financing activities:
Proceeds from revolving credit facility		180,000
Repayments of revolving credit facility		(180,000)
Net proceeds from commercial paper	108,000	20,000
Principal payments on notes payable	(119,481)	(3,483)
Payment of deferred financing costs		31
Distributions to noncontrolling interests	(8,302)	(8,126)
Dividends paid on common shares	(234,591)	(228,618)
Dividends paid on preferred shares	(1,844)	(1,844)
Net change in other financing activities	(1,173)	(4,625)
Net cash used in financing activities	(257,391)	(226,727)
Payment of deferred financing costs		(31)
Net increase (decrease) in cash, cash equivalents and restricted cash	7,389	(34,947)
Cash, cash equivalents and restricted cash, beginning of period	35,615	70,541
Cash, cash equivalents and restricted cash, end of period	43,004	35,594
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	31,881	19,667
Restricted cash	11,123	15,927
Cash, cash equivalents and restricted cash, end of period	43,004	35,594
Supplemental disclosure of cash flow information:
Interest paid	81,122	84,623
Income taxes paid	2,474	120
Supplemental disclosure of noncash investing and financing activities:
Conversion of OP Units to shares of common stock	22,164	450
Accrued construction in progress	30,771	18,991
Interest capitalized	5,333	3,019
Limited Partner [Member]
Cash flows from operating activities:
Net income	272,739	115,680
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	263,912	254,105
(Gain) loss on sale of depreciable real estate assets	(134,828)	27
(Gain) loss on sale of non-depreciable real estate assets	(32)	371
Loss on embedded derivative in preferred shares	1,940	15,945
Stock compensation expense	9,212	8,150
Amortization of debt issuance costs, discounts and premiums	2,674	2,290
Net change in operating accounts and other operating activities	(18,299)	(6,953)
Net cash provided by operating activities	397,318	389,615
Cash flows from investing activities:
Purchases of real estate and other assets	(46,028)	(5,004)
Capital improvements, development and other	(247,544)	(191,850)
Distributions from real estate joint venture	392	84
Contributions to affiliates	(1,114)	(1,725)
Proceeds from disposition of real estate assets	161,756	660
Net cash used in investing activities	(132,538)	(197,835)
Cash flows from financing activities:
Proceeds from revolving credit facility		180,000
Repayments of revolving credit facility		(180,000)
Net proceeds from commercial paper	108,000	20,000
Principal payments on notes payable	(119,481)	(3,483)
Payment of deferred financing costs		31
Dividends paid on common shares	(242,893)	(236,744)
Dividends paid on preferred shares	(1,844)	(1,844)
Net change in other financing activities	(1,173)	(4,625)
Net cash used in financing activities	(257,391)	(226,727)
Payment of deferred financing costs		(31)
Net increase (decrease) in cash, cash equivalents and restricted cash	7,389	(34,947)
Cash, cash equivalents and restricted cash, beginning of period	35,615	70,541
Cash, cash equivalents and restricted cash, end of period	43,004	35,594
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	31,881	19,667
Restricted cash	11,123	15,927
Cash, cash equivalents and restricted cash, end of period	43,004	35,594
Supplemental disclosure of cash flow information:
Interest paid	81,122	84,623
Income taxes paid	2,474	120
Supplemental disclosure of noncash investing and financing activities:
Accrued construction in progress	30,771	18,991
Interest capitalized	$ 5,333	$ 3,019