Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Treasury Stock	Distributions in Excess of Net Income	Stockholders’ Investment	Nonredeemable Noncontrolling Interests
Beginning balance at Dec. 31, 2019	$ 4,427,835	$ 1,717	$ 149,347	$ 5,493,883	$ (148,473)	$ (1,137,200)	$ 4,359,274	$ 68,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	226,800					226,159	226,159	641
Common stock issued pursuant to stock based compensation	(307)		90	(397)			(307)
Common stock issued pursuant to unitholder redemption	0	(1,717)	1,719	45,032			45,034	(45,034)
Amortization of stock options, restricted stock, and restricted stock units, net of forfeitures	3,354		(7)	3,361			3,354
Contributions from nonredeemable noncontrolling interests	4,133							4,133
Distributions to nonredeemable noncontrolling interests	(1,020)							(1,020)
Common dividends	(133,702)					(133,702)	(133,702)
Ending balance at Sep. 30, 2020	4,527,093	0	151,149	5,541,879	(148,473)	(1,044,743)	4,499,812	27,281
Beginning balance at Jun. 30, 2020	4,540,329		151,153	5,540,945	(148,473)	(1,028,289)	4,515,336	24,993
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,255					28,115	28,115	140
Amortization of stock options, restricted stock, and restricted stock units, net of forfeitures	930		(4)	934			930
Contributions from nonredeemable noncontrolling interests	2,317							2,317
Distributions to nonredeemable noncontrolling interests	(169)							(169)
Common dividends	(44,569)					(44,569)	(44,569)
Ending balance at Sep. 30, 2020	4,527,093	0	151,149	5,541,879	(148,473)	(1,044,743)	4,499,812	27,281
Beginning balance at Dec. 31, 2020	4,495,538	0	151,149	5,542,762	(148,473)	(1,078,304)	4,467,134	28,404
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	111,507					111,281	111,281	226
Common stock issued pursuant to stock based compensation	552		126	426			552
Amortization of stock options, restricted stock, and restricted stock units, net of forfeitures	4,618		(2)	4,620			4,618
Contributions from nonredeemable noncontrolling interests	5,017							5,017
Distributions to nonredeemable noncontrolling interests	(1,197)							(1,197)
Common dividends	(138,493)					(138,493)	(138,493)
Ending balance at Sep. 30, 2021	4,477,542	0	151,273	5,547,808	(148,473)	(1,105,516)	4,445,092	32,450
Beginning balance at Jun. 30, 2021	4,467,404		151,273	5,546,336	(148,473)	(1,113,273)	4,435,863	31,541
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	54,136					54,018	54,018	118
Amortization of stock options, restricted stock, and restricted stock units, net of forfeitures	1,472			1,472			1,472
Contributions from nonredeemable noncontrolling interests	1,635							1,635
Distributions to nonredeemable noncontrolling interests	(844)							(844)
Common dividends	(46,261)					(46,261)	(46,261)
Ending balance at Sep. 30, 2021	$ 4,477,542	$ 0	$ 151,273	$ 5,547,808	$ (148,473)	$ (1,105,516)	$ 4,445,092	$ 32,450