CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Additional Paid In Capital	Cumulative Net Income	Cumulative Common Distributions
Balance (in shares) at Dec. 31, 2020		48,318,366
Beginning balance at Dec. 31, 2020	$ 1,609,392	$ 483	$ 2,615,305	$ 183,895	$ (1,190,291)
Increase (Decrease) in Shareholders' Equity
Share grants	321		321
Net income (loss)	37,860			37,860
Distributions to common shareholders	(26,575)				(26,575)
Balance (in shares) at Mar. 31, 2021		48,318,366
Ending balance at Mar. 31, 2021	1,620,998	$ 483	2,615,626	221,755	(1,216,866)
Balance (in shares) at Dec. 31, 2021		48,425,665
Beginning balance at Dec. 31, 2021	1,496,709	$ 484	2,617,169	175,715	(1,296,659)
Increase (Decrease) in Shareholders' Equity
Share grants	415		415
Share forfeitures (in shares)		(400)
Share forfeitures	(1)		(1)
Net income (loss)	(13,407)			(13,407)
Distributions to common shareholders	(26,634)				(26,634)
Balance (in shares) at Mar. 31, 2022		48,425,265
Ending balance at Mar. 31, 2022	$ 1,457,082	$ 484	$ 2,617,583	$ 162,308	$ (1,323,293)