CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Preferred Shares	Common Shares	Additional Paid-in-Capital	Accumulated Distributions in Excess of Net Income	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning Balance at Dec. 31, 2019	$ 1,724,719	$ 94,016	$ 25	$ 2,976,670	$ (1,363,676)	$ (1,928)	$ 19,612
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of partnership interest in real estate	421						421
Redemption of noncontrolling OP units for common shares				428			(428)
Issuance of common shares and deferred compensation amortization, net	18,931		1	18,930
Repurchase of common shares to settle tax obligations	(2,623)			(2,623)
Forfeiture of employee common shares	1				1
Dividends/distributions	(29,161)				(28,765)		(396)
Repurchase of common shares	(11,042)			(11,042)
Net income	18,420				18,154		266
Other comprehensive loss	(16,996)					(16,996)
Ending Balance at Mar. 31, 2020	1,702,670	94,016	26	2,982,363	(1,374,286)	(18,924)	19,475
Beginning Balance at Dec. 31, 2020	1,991,137	94,016	28	3,196,315	(1,301,726)	(17,963)	20,467
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of partnership interest in real estate	2,712						2,712
Redemption of noncontrolling OP units for common shares				311			(311)
Issuance of common shares and deferred compensation amortization, net	1,517			1,517
Repurchase of common shares to settle tax obligations	(5,120)			(5,120)
Forfeiture of employee common shares	2				2
Dividends/distributions	(31,743)				(31,369)		(374)
Net income	41,475				41,042		433
Other comprehensive loss	5,346					5,346
Ending Balance at Mar. 31, 2021	$ 2,005,326	$ 94,016	$ 28	$ 3,193,023	$ (1,292,051)	$ (12,617)	$ 22,927