Condensed 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, 2018	$ 2,821,156	$ 1,717	$ 107,681	$ 3,934,385	$ (148,473)	$ (1,129,445)	$ 2,765,865	$ 55,291
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	34,115					33,306	33,306	809
Common stock issued in merger	1,598,189		41,576	1,556,613			1,598,189
Common stock issued pursuant to stock based compensation	510		91	419			510
Amortization of stock options, restricted stock, and restricted stock units, net of forfeitures	1,847		(1)	1,848			1,847
Nonredeemable noncontrolling interests acquired in merger	5,348							5,348
Contributions from nonredeemable noncontrolling interests	5,271							5,271
Distributions to nonredeemable noncontrolling interests	(1,745)							(1,745)
Common dividends	(115,613)					(115,613)	(115,613)
Ending balance at Sep. 30, 2019	4,349,078	1,717	149,347	5,493,265	(148,473)	(1,211,752)	4,284,104	64,974
Beginning balance at Jun. 30, 2019	4,369,618	1,717	149,348	5,492,648	(148,473)	(1,189,567)	4,305,673	63,945
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,692					20,374	20,374	318
Amortization of stock options, restricted stock, and restricted stock units, net of forfeitures	616		(1)	617			616
Contributions from nonredeemable noncontrolling interests	1,191							1,191
Distributions to nonredeemable noncontrolling interests	(480)							(480)
Common dividends	(42,559)					(42,559)	(42,559)
Ending balance at Sep. 30, 2019	4,349,078	1,717	149,347	5,493,265	(148,473)	(1,211,752)	4,284,104	64,974
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	0	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