Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Changes in equity
Beginning Balance	$ 10,908,587	$ 10,668,904	$ 10,752,174	$ 10,870,805	$ 10,912,542	$ 10,990,198	$ 10,752,174	$ 10,990,198
Net income attributable to common stockholders	78,914	447,953	142,223	147,703	170,828	167,971	669,090	486,502
Gain (loss) on cash flow hedges	2,010	(822)		1,333	(1,461)	(17,603)	1,188	(17,731)
Cash flow hedge losses reclassified to earnings	7,405	2,366	2,367	2,367	2,301	1,949	12,138	6,617
Change in redemption value of redeemable noncontrolling interest	(261)	(255)	(273)	62	(146)	471
Noncontrolling interest distribution and income allocation	2	(7)	(16)	(17)	1	(35)
Dividends, Common Stock	(222,475)	(222,451)	(221,779)	(222,694)	(224,172)	(224,083)
Issuance of common stock, net of withholdings	4,606	2,496	(13,078)	105	1,188	(14,107)
Stock Repurchased During Period, Value				(137,458)
Amortization of deferred compensation	9,442	10,403	7,286	8,036	9,724	7,781
Ending Balance	$ 10,788,230	$ 10,908,587	$ 10,668,904	$ 10,670,242	$ 10,870,805	$ 10,912,542	10,788,230	10,670,242
Dividends declared to common stockholders (in dollars per share)	$ 1.59	$ 1.59	$ 1.59	$ 1.59	$ 1.59	$ 1.59
Common stock
Changes in equity
Beginning Balance	$ 1,396	$ 1,396	$ 1,395	$ 1,407	$ 1,407	$ 1,406	1,395	1,406
Issuance of common stock, net of withholdings			1			1
Stock Repurchased During Period, Value				(9)
Ending Balance	1,396	1,396	1,396	1,398	1,407	1,407	1,396	1,398
Additional paid-in capital
Changes in equity
Beginning Balance	10,670,564	10,657,665	10,664,416	10,742,796	10,732,022	10,736,733	10,664,416	10,736,733
Issuance of common stock, net of withholdings	4,633	2,496	(14,037)	105	1,050	(12,492)
Stock Repurchased During Period, Value				(69,779)
Amortization of deferred compensation	9,442	10,403	7,286	8,036	9,724	7,781
Ending Balance	10,684,639	10,670,564	10,657,665	10,681,158	10,742,796	10,732,022	10,684,639	10,681,158
Accumulated earnings less dividends
Changes in equity
Beginning Balance	272,398	47,151	126,022	172,304	225,656	282,913	126,022	282,913
Net income attributable to common stockholders	78,914	447,953	142,223	147,703	170,828	167,971
Change in redemption value of redeemable noncontrolling interest	(261)	(255)	(273)	62	(146)	471	(789)	387
Dividends, Common Stock	(222,475)	(222,451)	(221,779)	(222,694)	(224,172)	(224,083)
Issuance of common stock, net of withholdings	(27)		958		138	(1,616)
Stock Repurchased During Period, Value				(67,670)
Ending Balance	128,549	272,398	47,151	29,705	172,304	225,656	128,549	29,705
Accumulated other comprehensive loss
Changes in equity
Beginning Balance	(36,339)	(37,883)	(40,250)	(46,317)	(47,157)	(31,503)	(40,250)	(31,503)
Gain (loss) on cash flow hedges	2,010	(822)		1,333	(1,461)	(17,603)
Cash flow hedge losses reclassified to earnings	7,405	2,366	2,367	2,367	2,301	1,949
Ending Balance	(26,924)	(36,339)	(37,883)	(42,617)	(46,317)	(47,157)	(26,924)	(42,617)
Parent
Changes in equity
Beginning Balance	10,908,019	10,668,329	10,751,583	10,870,190	10,911,928	10,989,549	10,751,583	10,989,549
Net income attributable to common stockholders	78,914	447,953	142,223	147,703	170,828	167,971
Gain (loss) on cash flow hedges	2,010	(822)		1,333	(1,461)	(17,603)
Cash flow hedge losses reclassified to earnings	7,405	2,366	2,367	2,367	2,301	1,949
Change in redemption value of redeemable noncontrolling interest	(261)	(255)	(273)	62	(146)	471
Dividends, Common Stock	(222,475)	(222,451)	(221,779)	(222,694)	(224,172)	(224,083)
Issuance of common stock, net of withholdings	4,606	2,496	(13,078)	105	1,188	(14,107)
Stock Repurchased During Period, Value				(137,458)
Amortization of deferred compensation	9,442	10,403	7,286	8,036	9,724	7,781
Ending Balance	10,787,660	10,908,019	10,668,329	10,669,644	10,870,190	10,911,928	10,787,660	10,669,644
Noncontrolling Interest
Changes in equity
Beginning Balance	568	575	591	615	614	649	591	649
Noncontrolling interest distribution and income allocation	2	(7)	(16)	(17)	1	(35)
Ending Balance	$ 570	$ 568	$ 575	$ 598	$ 615	$ 614	$ 570	$ 598