Consolidated Statement of Capital and Noncontrolling Interests - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Common Stock, Shares, Outstanding	157,049,171		156,940,866
Effective portion of interest rate contracts	$ 16,351	$ (6,538)
Amortization of interest rate contracts	3,360	1,675
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships	142,942	7,555
Distributions to noncontrolling interests in property partnerships	$ (20,025)	$ (21,606)
General Partner [Member]
Common Stock, Shares, Outstanding	1,762,000	1,755,000	1,755,000	1,750,000
Net activity from contributions and unearned compensation	5,000	5,000
Conversion of redeemable partnership units	2,000
Limited Partner [Member]
Common Stock, Shares, Outstanding	155,287,000	155,075,000	155,185,000	155,008,000
Net activity from contributions and unearned compensation	68,000	62,000
Conversion of redeemable partnership units	34,000	5,000
Partners' Capital (General and Limited Partners)[Member]
Beginning Balance	$ 5,004,678	$ 5,449,936	$ 4,973,951	$ 5,299,428
Net activity from contributions and unearned compensation, value	2,862	4,032
Allocated net income for the period	81,580	79,752
Distributions	(153,908)	(153,693)
Conversion of redeemable partnership units, value	1,303	195
Adjustment to reflect redeemable partnership units at redemption value	52,808	220,222
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships	46,082
Accumulated Other Comprehensive Loss [Member]
Beginning Balance	(3,620)	(18,214)	(21,147)	(13,718)
Effective portion of interest rate contracts	14,646	(5,870)
Amortization of interest rate contracts	2,881	1,374
Noncontrolling interest - property partnerships [Member]
Beginning Balance	1,734,904	1,552,070	1,640,704	1,547,317
Allocated net income for the period	17,221	18,660
Amortization of interest rate contracts	144	144
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships	96,860	7,555
Distributions to noncontrolling interests in property partnerships	(20,025)	(21,606)
Total Capital [Member]
Beginning Balance	6,735,962	6,983,792	6,593,508	6,833,027
Net activity from contributions and unearned compensation, value	2,862	4,032
Allocated net income for the period	98,801	98,412
Distributions	(153,908)	(153,693)
Conversion of redeemable partnership units, value	1,303	195
Adjustment to reflect redeemable partnership units at redemption value	52,808	220,222
Effective portion of interest rate contracts	14,646	(5,870)
Amortization of interest rate contracts	3,025	1,518
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships	142,942	7,555
Distributions to noncontrolling interests in property partnerships	(20,025)	(21,606)
Noncontrolling interest - Redeemable partnership units [Member]
Beginning Balance	1,300,409	1,074,648	$ 1,347,575	$ 1,280,886
Net activity from contributions and unearned compensation, value	14,269	23,973
Allocated net income for the period	9,500	9,078
Distributions	(18,864)	(18,361)
Conversion of redeemable partnership units, value	(1,303)	(195)
Adjustment to reflect redeemable partnership units at redemption value	(52,808)	(220,222)
Effective portion of interest rate contracts	1,705	(668)
Amortization of interest rate contracts	$ 335	$ 157