CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Additional Paid In Capital	Cumulative Net Income	Cumulative Other Comprehensive Income (Loss)	Cumulative Common Distributions
Balance beginning (in shares) at Dec. 31, 2018		48,082,903
Balance beginning at Dec. 31, 2018	$ 1,778,968	$ 481	$ 2,609,801	$ 146,882	$ 106	$ (978,302)
Increase (Decrease) in Shareholders' Equity
Share grants (in shares)		136,100
Share grants	3,098	$ 1	3,097
Shares forfeitures or repurchases (in shares)		(17,062)
Share forfeitures and repurchases	(473)		(473)
Amounts reclassified from cumulative other comprehensive income to net income	(196)				(196)
Equity in unrealized gain of investees	90				90
Unrealized loss on financial instrument	(200)				(200)
Net income	30,335			30,335
Distributions to common shareholders	(105,868)					(105,868)
Balance ending (in shares) at Dec. 31, 2019		48,201,941
Balance ending at Dec. 31, 2019	1,705,754	$ 482	2,612,425	177,217	(200)	(1,084,170)
Increase (Decrease) in Shareholders' Equity
Share grants (in shares)		136,600
Share grants	3,324	$ 1	3,323
Shares forfeitures or repurchases (in shares)		(20,175)
Share forfeitures and repurchases	(443)		(443)
Amounts reclassified from cumulative other comprehensive income to net income	85				85
Unrealized loss on financial instrument	115				115
Net income	6,678			6,678
Distributions to common shareholders	(106,121)					(106,121)
Balance ending (in shares) at Dec. 31, 2020		48,318,366
Balance ending at Dec. 31, 2020	1,609,392	$ 483	2,615,305	183,895	0	(1,190,291)
Increase (Decrease) in Shareholders' Equity
Share grants (in shares)		145,800
Share grants	2,873	$ 1	2,872
Shares forfeitures or repurchases (in shares)		(38,501)
Share forfeitures and repurchases	(1,008)		(1,008)
Net income	(8,180)			(8,180)
Distributions to common shareholders	(106,368)					(106,368)
Balance ending (in shares) at Dec. 31, 2021		48,425,665
Balance ending at Dec. 31, 2021	$ 1,496,709	$ 484	$ 2,617,169	$ 175,715	$ 0	$ (1,296,659)