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, 2019		405,896	75,540,804
Beginning 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 (loss), excluding amounts attributable to redeemable noncontrolling interests	32,050				36,981		(4,931)
Other comprehensive (loss) income - change in fair value of interest rate swaps	(6,487)					(6,487)
Dividends declared to common shareholders	(238,980)				(238,980)
Dividends declared to preferred shareholders	(6,031)				(6,031)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(2,465)						(2,465)
Common shares issued, net (in shares)			57
Common shares issued, net	5		$ 0	5
Shares issued under dividend reinvestment plan (in shares)			17,669
Shares issued under dividend reinvestment plan	1,461			1,461
Share-based compensation expense, net of forfeitures (in shares)			115,368
Share-based compensation expense, net of forfeitures	10,144		$ 1	10,143
Shares withheld for employee taxes (in shares)			(32,824)
Shares withheld for employee taxes	(4,035)			(4,035)
Conversion and redemption of OP units	(3,320)			(30)			(3,290)
Contributions from noncontrolling interests	120						120
Ending balance (in shares) at Sep. 30, 2020		405,896	75,641,074
Ending balance at Sep. 30, 2020	2,418,084	$ 159,997	$ 760	3,174,066	(999,664)	(7,300)	90,225
Beginning balance (in shares) at Jun. 30, 2020		405,896	75,633,140
Beginning balance at Jun. 30, 2020	2,531,101	$ 159,997	$ 760	3,170,480	(889,195)	(7,758)	96,817
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss), excluding amounts attributable to redeemable noncontrolling interests	(34,093)				(28,289)		(5,804)
Other comprehensive (loss) income - change in fair value of interest rate swaps	458					458
Dividends declared to common shareholders	(80,170)				(80,170)
Dividends declared to preferred shareholders	(2,010)				(2,010)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(788)						(788)
Common shares issued, net (in shares)			28
Common shares issued, net	3		$ 0	3
Shares issued under dividend reinvestment plan (in shares)			7,064
Shares issued under dividend reinvestment plan	506			506
Share-based compensation expense, net of forfeitures (in shares)			1,276
Share-based compensation expense, net of forfeitures	3,115		$ 0	3,115
Shares withheld for employee taxes (in shares)			(434)
Shares withheld for employee taxes	(38)			(38)
Ending balance (in shares) at Sep. 30, 2020		405,896	75,641,074
Ending balance at Sep. 30, 2020	2,418,084	$ 159,997	$ 760	3,174,066	(999,664)	(7,300)	90,225
Beginning balance (in shares) at Dec. 31, 2020		405,896	76,727,394
Beginning 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 (loss), excluding amounts attributable to redeemable noncontrolling interests	148,867				146,562		2,305
Other comprehensive income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interest	2,918					2,918
Dividends declared to common shareholders	(248,000)				(248,000)
Dividends declared to preferred shareholders	(6,031)				(6,031)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(3,282)						(3,282)
Common shares issued, net (in shares)			847,528
Common shares issued, net	87,066		$ 9	87,057
Shares issued under dividend reinvestment plan (in shares)			15,710
Shares issued under dividend reinvestment plan	1,507			1,507
Share-based compensation expense, net of forfeitures (in shares)			163,092
Share-based compensation expense, net of forfeitures	10,874		$ 2	10,872
Shares withheld for employee taxes (in shares)			(28,563)
Shares withheld for employee taxes	(2,939)			(2,939)
Conversion and redemption of OP units (in Shares)			49,484
Conversion and redemption of OP units	(99)		$ 0	5,049			(5,148)
Contributions from noncontrolling interests	6,554						6,554
Ending balance (in shares) at Sep. 30, 2021		405,896	77,774,645
Ending balance at Sep. 30, 2021	2,546,182	$ 159,997	$ 782	3,398,851	(1,095,741)	(2,726)	85,019
Beginning balance (in shares) at Jun. 30, 2021		405,896	77,760,588
Beginning balance at Jun. 30, 2021	2,575,839	$ 159,997	$ 782	3,395,189	(1,062,641)	(3,238)	85,750
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss), excluding amounts attributable to redeemable noncontrolling interests	52,946				52,122		824
Other comprehensive income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interest	512					512
Dividends declared to common shareholders	(83,212)				(83,212)
Dividends declared to preferred shareholders	(2,010)				(2,010)
Distributions declared to noncontrolling interests, excluding amounts attributable to redeemable noncontrolling interests	(1,555)						(1,555)
Common shares issued, net (in shares)			19
Common shares issued, net	(67)		$ 0	(67)
Shares issued under dividend reinvestment plan (in shares)			4,194
Shares issued under dividend reinvestment plan	488			488
Share-based compensation expense, net of forfeitures (in shares)			10,907
Share-based compensation expense, net of forfeitures	3,367		$ 0	3,367
Shares withheld for employee taxes (in shares)			(1,063)
Shares withheld for employee taxes	(126)			(126)
Ending balance (in shares) at Sep. 30, 2021		405,896	77,774,645
Ending balance at Sep. 30, 2021	$ 2,546,182	$ 159,997	$ 782	$ 3,398,851	$ (1,095,741)	$ (2,726)	$ 85,019