Consolidated Statement of Capital and Noncontrolling Interests - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Common Stock, Shares, Outstanding	156,853,400		156,853,400			156,757,867
Net activity from stock option and incentive plan, value	$ 13,942	$ 18,025	$ 41,361	$ 36,946
Effective portion of interest rate contracts	14,965	35	8,427	7,600
Amortization of interest rate contracts	1,674	1,677	3,349	3,353
Contributions from noncontrolling interests in property partnerships			7,555	849
Distributions to noncontrolling interests in property partnerships	$ (14,614)	$ (14,439)	$ (36,220)	$ (41,079)
General Partner [Member]
Common Stock, Shares, Outstanding	1,755,000	1,750,000	1,755,000	1,750,000	1,755,000	1,750,000	1,749,000	1,746,000
Net activity from contributions and unearned compensation	0	1,000	5,000	1,000
Conversion of redeemable partnership units			0	3,000
Limited Partner [Member]
Common Stock, Shares, Outstanding	155,098,000	154,977,000	155,098,000	154,977,000	155,075,000	155,008,000	154,962,000	154,799,000
Net activity from contributions and unearned compensation	7,000	4,000	69,000	29,000
Conversion of redeemable partnership units	16,000	11,000	21,000	149,000
Partners' Capital (General and Limited Partners)[Member]
Beginning Balance	$ 5,351,166	$ 4,716,430	$ 5,351,166	$ 4,716,430	$ 5,449,936	$ 5,299,428	$ 3,914,832	$ 4,173,290
Net activity from contributions and unearned compensation, value	(110)	4,418	3,922	4,885
Allocated net income for the period	106,007	228,088	185,759	373,556
Distributions	(153,716)	(153,592)	(307,409)	(307,169)
Conversion of redeemable partnership units, value	599	401	794	5,429
Adjustment to reflect redeemable partnership units at redemption value	(51,550)	722,283	168,672	466,439
Accumulated Other Comprehensive Loss [Member]
Beginning Balance	(3,406)	(27,077)	(3,406)	(27,077)	(18,214)	(13,718)	(28,485)	(36,662)
Effective portion of interest rate contracts	13,435	31	7,565	6,831
Amortization of interest rate contracts	1,373	1,377	2,747	2,754
Noncontrolling interest - property partnerships [Member]
Beginning Balance	1,557,368	1,552,706	1,557,368	1,552,706	1,552,070	1,547,317	1,548,455	1,556,553
Allocated net income for the period	19,768	18,546	38,428	36,095
Amortization of interest rate contracts	144	144	288	288
Contributions from noncontrolling interests in property partnerships			7,555	849
Distributions to noncontrolling interests in property partnerships	(14,614)	(14,439)	(36,220)	(41,079)
Total Capital [Member]
Beginning Balance	6,905,128	6,242,059	6,905,128	6,242,059	6,983,792	6,833,027	5,434,802	5,693,181
Net activity from contributions and unearned compensation, value	(110)	4,418	3,922	4,885
Allocated net income for the period	125,775	246,634	224,187	409,651
Distributions	(153,716)	(153,592)	(307,409)	(307,169)
Conversion of redeemable partnership units, value	599	401	794	5,429
Adjustment to reflect redeemable partnership units at redemption value	(51,550)	722,283	168,672	466,439
Effective portion of interest rate contracts	13,435	31	7,565	6,831
Amortization of interest rate contracts	1,517	1,521	3,035	3,042
Contributions from noncontrolling interests in property partnerships			7,555	849
Distributions to noncontrolling interests in property partnerships	(14,614)	(14,439)	(36,220)	(41,079)
Noncontrolling interest - Redeemable partnership units [Member]
Beginning Balance	1,135,053	1,646,678	1,135,053	1,646,678	$ 1,074,648	$ 1,280,886	$ 2,347,834	$ 2,078,603
Net activity from contributions and unearned compensation, value	14,052	13,607	38,025	32,661
Allocated net income for the period	12,091	25,700	21,169	42,061
Distributions	(18,376)	(17,939)	(36,737)	(35,859)
Conversion of redeemable partnership units, value	(599)	(401)	(794)	(5,429)
Adjustment to reflect redeemable partnership units at redemption value	51,550	(722,283)	(168,672)	(466,439)
Effective portion of interest rate contracts	1,530	4	862	769
Amortization of interest rate contracts	$ 157	$ 156	$ 314	$ 311