CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Cumulative Common Distributions	Additional Paid in Capital	Cumulative Net Income	Cumulative Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2019		164,563,034
Beginning balance at Dec. 31, 2019	$ 2,505,878	$ 1,646	$ (5,534,942)	$ 4,547,529	$ 3,491,645	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(311,382)				(311,382)
Equity in unrealized gains (losses) of investees	(760)					(760)
Common share grants (in shares)		305,400
Common share grants	3,211	$ 2		3,209
Common share repurchases and forfeitures (in shares)		(44,601)
Common share repurchases and forfeitures	(353)			(353)
Distributions	(93,804)		(93,804)
Ending balance (in shares) at Dec. 31, 2020		164,823,833
Ending balance at Dec. 31, 2020	2,102,790	$ 1,648	(5,628,746)	4,550,385	3,180,263	(760)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(544,603)				(544,603)
Equity in unrealized gains (losses) of investees	1,539					1,539
Common share grants (in shares)		340,700
Common share grants	2,967	$ 3		2,964
Common share repurchases and forfeitures (in shares)		(72,200)
Common share repurchases and forfeitures	(791)			(791)
Distributions	(6,596)		(6,596)
Ending balance (in shares) at Dec. 31, 2021		165,092,333
Ending balance at Dec. 31, 2021	1,555,306	$ 1,651	(5,635,342)	4,552,558	2,635,660	779
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(132,381)
Equity in unrealized gains (losses) of investees	1,604					1,604
Common share grants (in shares)		433,500
Common share grants	2,788	$ 4		2,784
Common share repurchases and forfeitures (in shares)		(73,267)
Common share repurchases and forfeitures	(481)			(481)
Distributions	(38,044)		(38,044)
Ending balance (in shares) at Dec. 31, 2022		165,452,566
Ending balance at Dec. 31, 2022	$ 1,388,792	$ 1,655	$ (5,673,386)	$ 4,554,861	$ 2,503,279	$ 2,383