Consolidated Statement Of Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Shares	Common shares	Additional Paid-in Capital	Accumulated Dividends in Excess of Net Income	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2018		405,896	74,249,633
Beginning balance at Dec. 31, 2018	$ 2,467,330	$ 159,997	$ 745	$ 3,004,442	$ (818,877)	$ (416)	$ 121,439
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard	(7,098)				(7,098)
Net income, excluding amount attributable to redeemable noncontrolling interests	357,112				353,866		3,246
Other comprehensive income (loss) - change in value of interest rate swaps	(397)					(397)
Dividends declared to common shareholders	(310,973)				(310,973)
Dividends declared to preferred shareholders	(8,042)				(8,042)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(9,961)						(9,961)
Common shares issued, net (in shares)			1,069,740
Common shares issued, net	$ 142,716		$ 11	142,705
Shares issued under dividend reinvestment plan (in shares)	15,909		15,909
Shares issued under dividend reinvestment plan	$ 2,095			2,095
Share-based compensation expense, net of forfeitures (in shares)			111,555
Share-based compensation expense, net of forfeitures	13,330		$ 1	13,329
Shares withheld for employee taxes (in shares)			(34,320)
Shares withheld for employee taxes	(4,626)			(4,626)
Conversion and redemption of OP units (in shares)			128,287
Conversion and redemption of OP units	(72)		$ 2	14,102			(14,176)
Contributions from noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	243						243
Adjustment to redeemable noncontrolling interests	(5,525)			(5,525)
Ending balance (in shares) at Dec. 31, 2019		405,896	75,540,804
Ending balance at Dec. 31, 2019	2,636,132	$ 159,997	$ 759	3,166,522	(791,124)	(813)	100,791
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard	(510)				(510)
Net income, excluding amount attributable to redeemable noncontrolling interests	133,660				131,706		1,954
Other comprehensive income (loss) - change in value of interest rate swaps, excluding amounts attributable to redeemable noncontrolling interests	(4,831)					(4,831)
Other comprehensive income (loss) - change in value of interest rate swaps	(5,302)
Dividends declared to common shareholders	(320,302)				(320,302)
Dividends declared to preferred shareholders	(8,042)				(8,042)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(8,874)						(8,874)
Common shares issued, net (in shares)			1,080,882
Common shares issued, net	$ 98,839		$ 11	98,828
Shares issued under dividend reinvestment plan (in shares)	24,491		24,491
Shares issued under dividend reinvestment plan	$ 2,072			2,072
Share-based compensation expense, net of forfeitures (in shares)			114,251
Share-based compensation expense, net of forfeitures	13,243		$ 1	13,242
Shares withheld for employee taxes (in shares)			(33,034)
Shares withheld for employee taxes	(4,052)			(4,052)
Conversion and redemption of OP units (in shares)			0
Conversion and redemption of OP units	(3,320)		$ 0	(30)			(3,290)
Contributions from noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	120						120
Purchase of noncontrolling interest	(7,321)			(1,210)			(6,111)
Adjustment to redeemable noncontrolling interests	21,933			21,933
Ending balance (in shares) at Dec. 31, 2020		405,896	76,727,394
Ending balance at Dec. 31, 2020	2,548,747	$ 159,997	$ 771	3,297,305	(988,272)	(5,644)	84,590
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income, excluding amount attributable to redeemable noncontrolling interests	264,785				261,498		3,287
Other comprehensive income (loss) - change in value of interest rate swaps, excluding amounts attributable to redeemable noncontrolling interests	3,597					3,597
Other comprehensive income (loss) - change in value of interest rate swaps	3,917
Dividends declared to common shareholders	(332,116)				(332,116)
Dividends declared to preferred shareholders	(8,042)				(8,042)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(4,341)						(4,341)
Common shares issued, net (in shares)			1,643,845
Common shares issued, net	$ 172,753		$ 17	172,736
Shares issued under dividend reinvestment plan (in shares)	19,758		19,758
Shares issued under dividend reinvestment plan	$ 1,955			1,955
Share-based compensation expense, net of forfeitures (in shares)			164,553
Share-based compensation expense, net of forfeitures	14,434		$ 2	14,432
Shares withheld for employee taxes (in shares)			(29,031)
Shares withheld for employee taxes	(2,998)			(2,998)
Conversion and redemption of OP units (in shares)			76,786
Conversion and redemption of OP units	(99)		$ 0	7,474			(7,573)
Contributions from noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	6,583						6,583
Adjustment to redeemable noncontrolling interests	(2,110)			(2,110)
Ending balance (in shares) at Dec. 31, 2021		405,896	78,603,305
Ending balance at Dec. 31, 2021	$ 2,663,148	$ 159,997	$ 790	$ 3,488,794	$ (1,066,932)	$ (2,047)	$ 82,546