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) Income	Noncontrolling Interests	Common Shares Additional Paid-in Capital
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]
January 1 adoption of new accounting standard - See Note 2	(7,098)				(7,098)
Net income, excluding amounts attributable to redeemable noncontrolling interests	60,927				60,144		783
Other comprehensive loss - change in fair value of interest rate swaps	(209)					(209)
Dividends declared to common shareholders	(76,106)				(76,106)
Dividends declared to preferred shareholders	(2,010)				(2,010)
Distributions declared to noncontrolling interests	(1,266)						(1,266)
Shares issued (in shares)			446,132
Shares issued	59,353		$ 5					$ 59,348
Shares issued under dividend reinvestment plan (in shares)			4,273
Shares issued under dividend reinvestment plan	528			528
Share-based compensation expense, net of forfeitures (in shares)			100,586
Share-based compensation expense, net of forfeitures	3,861		$ 1	3,860
Shares withheld for employee taxes (in shares)			(32,686)
Shares withheld for employee taxes	(4,414)			(4,414)
Conversion and redemption of OP units (in Shares)			69,046
Conversion and redemption of OP units	0		$ 1	7,550			(7,551)
Adjustment to redeemable noncontrolling interests	667			667
Ending balance (in shares) at Mar. 31, 2019		405,896	74,836,984
Ending balance at Mar. 31, 2019	2,501,563	$ 159,997	$ 752	3,071,981	(843,947)	(625)	113,405
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]
January 1 adoption of new accounting standard - See Note 2	(510)				(510)
Net income, excluding amounts attributable to redeemable noncontrolling interests	55,426				54,763		663
Other comprehensive loss - change in fair value of interest rate swaps	(6,452)					(6,452)
Dividends declared to common shareholders	(79,403)				(79,403)
Dividends declared to preferred shareholders	(2,010)				(2,010)
Distributions declared to noncontrolling interests	(783)						(783)
Shares issued (in shares)			13
Shares issued	2		$ 0					$ 2
Shares issued under dividend reinvestment plan (in shares)			3,834
Shares issued under dividend reinvestment plan	446			446
Share-based compensation expense, net of forfeitures (in shares)			110,066
Share-based compensation expense, net of forfeitures	3,942		$ 1	3,941
Shares withheld for employee taxes (in shares)			(32,213)
Shares withheld for employee taxes	(3,982)			(3,982)
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	120						120
Ending balance (in shares) at Mar. 31, 2020		405,896	75,622,504
Ending balance at Mar. 31, 2020	$ 2,599,608	$ 159,997	$ 760	$ 3,166,899	$ (818,284)	$ (7,265)	$ 97,501