CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Shares	Common Shares	Additional Paid-in Capital	Accumulated Distributions in Excess of Net Income	Accumulated Distributions in Excess of Net Income Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interest	Noncontrolling Interest Cumulative Effect, Period of Adoption, Adjustment
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Beginning Balance at Dec. 31, 2017	$ 885,169	$ 2,160	$ 92,427	$ 794	$ 1,160,862	$ (392,619)	$ 2,109	$ 2,858	$ 20,847	$ 51
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares, net of costs	(39)				(39)
Redemption of OP Unit holders	(97)					(18)			(79)
Share-based compensation, net of shares withheld for employee taxes	4,028			3	4,025
Dividends declared to common shareholders	(70,060)					(70,060)
Dividends declared to preferred shareholders	(6,701)					(6,701)
Distributions declared to noncontrolling interests	(1,683)								(1,683)
Dividends declared to deferred shares	(460)					(460)
Other comprehensive income adjustment	1,190							1,162	28
Net (loss) income	18,036					17,619			417
Ending Balance at Dec. 31, 2018	831,543	$ (333)	92,427	797	1,164,848	(450,130)	$ (325)	4,020	19,581	$ (8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares, net of costs	(96)				(96)
Share-based compensation, net of shares withheld for employee taxes	4,806			1	4,805
Dividends declared to common shareholders	(70,237)					(70,237)
Dividends declared to preferred shareholders	(6,701)					(6,701)
Distributions declared to noncontrolling interests	(1,681)								(1,681)
Dividends declared to deferred shares	(479)					(479)
Other comprehensive loss adjustment	(2,253)							(2,201)	(52)
Net (loss) income	93,686					91,511			2,175
Ending Balance at Dec. 31, 2019	848,255		92,427	798	1,169,557	(436,361)		1,819	20,015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares, net of costs	(385)				(385)
Share-based compensation, net of shares withheld for employee taxes	5,146			3	5,143
Dividends declared to common shareholders	(17,586)					(17,586)
Dividends declared to preferred shareholders	(6,701)					(6,701)
Distributions declared to noncontrolling interests	(420)								(420)
Dividends declared to deferred shares	(136)					(136)
Other comprehensive loss adjustment	(16,330)							(15,951)	(379)
Net (loss) income	(10,474)					(10,233)			(241)
Ending Balance at Dec. 31, 2020	$ 801,369		$ 92,427	$ 801	$ 1,174,315	$ (471,017)		$ (14,132)	$ 18,975