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, 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
Net income (loss)	(28,837)
Balance (in shares) at Jun. 30, 2021		48,334,357
Ending balance at Jun. 30, 2021	1,528,550	$ 483	2,616,450	155,058	(1,243,441)
Balance (in shares) at Mar. 31, 2021		48,318,366
Beginning balance at Mar. 31, 2021	1,620,998	$ 483	2,615,626	221,755	(1,216,866)
Increase (Decrease) in Shareholders' Equity
Share grants (in shares)		28,000
Share grants	1,176		1,176
Share repurchases (in shares)		(12,009)
Share repurchases	(352)		(352)
Net income (loss)	(66,697)			(66,697)
Distributions to common shareholders	(26,575)				(26,575)
Balance (in shares) at Jun. 30, 2021		48,334,357
Ending balance at Jun. 30, 2021	1,528,550	$ 483	2,616,450	155,058	(1,243,441)
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 and repurchases (in shares)		(400)
Share forfeitures and repurchases	(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)
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 repurchases (in shares)	(790)
Net income (loss)	$ (29,463)
Balance (in shares) at Jun. 30, 2022		48,455,075
Ending balance at Jun. 30, 2022	1,415,450	$ 485	2,618,640	146,252	(1,349,927)
Balance (in shares) at Mar. 31, 2022		48,425,265
Beginning balance at Mar. 31, 2022	1,457,082	$ 484	2,617,583	162,308	(1,323,293)
Increase (Decrease) in Shareholders' Equity
Share grants (in shares)		31,500
Share grants	1,079	$ 1	1,078
Share forfeitures and repurchases (in shares)		(1,690)
Share forfeitures and repurchases	(21)		(21)
Net income (loss)	(16,056)			(16,056)
Distributions to common shareholders	(26,634)				(26,634)
Balance (in shares) at Jun. 30, 2022		48,455,075
Ending balance at Jun. 30, 2022	$ 1,415,450	$ 485	$ 2,618,640	$ 146,252	$ (1,349,927)