Consolidated Statement of Capital and Noncontrolling Interests - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Common Stock, Shares, Outstanding	156,939,180		156,939,180			156,757,867
Net activity from stock option and incentive plan, value	$ 4,486	$ 8,528	$ 45,847	$ 45,474
Effective portion of interest rate contracts	5,459	10,800	13,886	18,400
Amortization of interest rate contracts	1,677	1,677	5,026	5,030
Contributions from noncontrolling interests in property partnerships	5,116		12,671	849
Non-cash contributions from noncontrolling interest in property partnerhips	17,519		17,519
Distributions to noncontrolling interests in property partnerships	$ (12,150)	$ (20,150)	$ (48,370)	$ (61,229)
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	1,750,000	1,746,000
Net activity from contributions and unearned compensation	0	0	5,000	1,000
Conversion of redeemable partnership units			0	3,000
Limited Partner [Member]
Common Stock, Shares, Outstanding	155,184,000	155,005,000	155,184,000	155,005,000	155,098,000	155,008,000	154,977,000	154,799,000
Net activity from contributions and unearned compensation	7,000	2,000	76,000	31,000
Conversion of redeemable partnership units	79,000	26,000	100,000	175,000
Partners' Capital (General and Limited Partners)[Member]
Beginning Balance	$ 5,036,445	$ 5,197,585	$ 5,036,445	$ 5,197,585	$ 5,351,166	$ 5,299,428	$ 4,716,430	$ 4,173,290
Net activity from contributions and unearned compensation, value	991	2,082	4,913	6,967
Allocated net income for the period	(110,169)	362,818	75,590	736,374
Distributions	(153,800)	(153,620)	(461,209)	(460,789)
Conversion of redeemable partnership units, value	2,920	959	3,714	6,388
Adjustment to reflect redeemable partnership units at redemption value	(54,663)	268,916	114,009	735,355
Accumulated Other Comprehensive Loss [Member]
Beginning Balance	2,866	(15,991)	2,866	(15,991)	(3,406)	(13,718)	(27,077)	(36,662)
Effective portion of interest rate contracts	4,896	9,709	12,461	16,540
Amortization of interest rate contracts	1,376	1,377	4,123	4,131
Noncontrolling interest - property partnerships [Member]
Beginning Balance	1,588,906	1,551,501	1,588,906	1,551,501	1,557,368	1,547,317	1,552,706	1,556,553
Allocated net income for the period	20,909	18,801	59,337	54,896
Amortization of interest rate contracts	144	144	432	432
Contributions from noncontrolling interests in property partnerships	5,116		12,671	849
Non-cash contributions from noncontrolling interest in property partnerhips	17,519		17,519
Distributions to noncontrolling interests in property partnerships	(12,150)	(20,150)	(48,370)	(61,229)
Total Capital [Member]
Beginning Balance	6,628,217	6,733,095	6,628,217	6,733,095	6,905,128	6,833,027	6,242,059	5,693,181
Net activity from contributions and unearned compensation, value	991	2,082	4,913	6,967
Allocated net income for the period	(89,260)	381,619	134,927	791,270
Distributions	(153,800)	(153,620)	(461,209)	(460,789)
Conversion of redeemable partnership units, value	2,920	959	3,714	6,388
Adjustment to reflect redeemable partnership units at redemption value	(54,663)	268,916	114,009	735,355
Effective portion of interest rate contracts	4,896	9,709	12,461	16,540
Amortization of interest rate contracts	1,520	1,521	4,555	4,563
Contributions from noncontrolling interests in property partnerships	5,116		12,671	849
Non-cash contributions from noncontrolling interest in property partnerhips	17,519		17,519
Distributions to noncontrolling interests in property partnerships	(12,150)	(20,150)	(48,370)	(61,229)
Noncontrolling interest - Redeemable partnership units [Member]
Beginning Balance	1,160,753	1,407,762	1,160,753	1,407,762	$ 1,135,053	$ 1,280,886	$ 1,646,678	$ 2,078,603
Net activity from contributions and unearned compensation, value	4,065	6,882	42,090	39,543
Allocated net income for the period	(12,527)	40,760	8,642	82,821
Distributions	(18,301)	(17,930)	(55,038)	(53,789)
Conversion of redeemable partnership units, value	(2,920)	(959)	(3,714)	(6,388)
Adjustment to reflect redeemable partnership units at redemption value	54,663	(268,916)	(114,009)	(735,355)
Effective portion of interest rate contracts	563	1,091	1,425	1,860
Amortization of interest rate contracts	$ 157	$ 156	$ 471	$ 467