Condensed 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 Income (Loss)	Noncontrolling Interest	Noncontrolling Interest Cumulative Effect, Period of Adoption, Adjustment
Beginning 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 issuance costs	(94)				(94)
Share-based compensation, net of shares withheld for employee taxes	2,307			1	2,306
Dividends declared to common shareholders	(35,102)					(35,102)
Dividends declared to preferred shareholders	(3,350)					(3,350)
Distributions declared to noncontrolling interests	(841)								(841)
Dividends declared to deferred shares	(248)					(248)
Other comprehensive income - loss on interest rate swaps	(4,073)							(3,978)	(95)
Net loss	13,655					13,336			319
Ending balance at Jun. 30, 2019	803,464		92,427	798	1,167,060	(475,819)		42	18,956
Beginning balance at Mar. 31, 2019	821,791		92,427	798	1,166,048	(459,365)		2,517	19,366
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares, net of issuance costs	(94)				(94)
Share-based compensation, net of shares withheld for employee taxes	1,106				1,106
Dividends declared to common shareholders	(17,556)					(17,556)
Dividends declared to preferred shareholders	(1,675)					(1,675)
Distributions declared to noncontrolling interests	(420)								(420)
Dividends declared to deferred shares	(116)					(116)
Other comprehensive income - loss on interest rate swaps	(2,534)							(2,475)	(59)
Net loss	2,962					2,893			69
Ending balance at Jun. 30, 2019	803,464		92,427	798	1,167,060	(475,819)		42	18,956
Beginning 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 issuance costs	(385)				(385)
Share-based compensation, net of shares withheld for employee taxes	2,117			2	2,115
Dividends declared to common shareholders	(17,593)					(17,593)
Dividends declared to preferred shareholders	(3,350)					(3,350)
Distributions declared to noncontrolling interests	(420)								(420)
Dividends declared to deferred shares	(136)					(136)
Other comprehensive income - loss on interest rate swaps	(19,436)							(18,986)	(450)
Net loss	(2,614)					(2,554)			(60)
Ending balance at Jun. 30, 2020	806,438		92,427	800	1,171,287	(459,994)		(17,167)	19,085
Beginning balance at Mar. 31, 2020	811,836		92,427	800	1,169,929	(455,431)		(15,091)	19,202
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares, net of issuance costs	(30)				(30)
Share-based compensation, net of shares withheld for employee taxes	1,388				1,388
Dividends declared to preferred shareholders	(1,675)					(1,675)
Other comprehensive income - loss on interest rate swaps	(2,125)							(2,076)	(49)
Net loss	(2,956)					(2,888)			(68)
Ending balance at Jun. 30, 2020	$ 806,438		$ 92,427	$ 800	$ 1,171,287	$ (459,994)		$ (17,167)	$ 19,085