CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Cumulative Common Distributions	Additional Paid in Capital	Cumulative Net Income Available for Common Shareholders	Cumulative Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2021		165,092,333
Beginning balance at Dec. 31, 2021	$ 1,555,306	$ 1,651	$ (5,635,342)	$ 4,552,558	$ 2,635,660	$ 779
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(119,822)				(119,822)
Equity in unrealized (losses) gains of investees	4					4
Common share grants	462			462
Common share forfeitures (in shares)		(800)
Distributions	(1,651)		(1,651)
Ending balance (in shares) at Mar. 31, 2022		165,091,533
Ending balance at Mar. 31, 2022	1,434,299	$ 1,651	(5,636,993)	4,553,020	2,515,838	783
Beginning balance (in shares) at Dec. 31, 2021		165,092,333
Beginning balance at Dec. 31, 2021	1,555,306	$ 1,651	(5,635,342)	4,552,558	2,635,660	779
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(100,972)
Equity in unrealized (losses) gains of investees	734
Ending balance (in shares) at Sep. 30, 2022		165,453,584
Ending balance at Sep. 30, 2022	1,451,918	$ 1,654	(5,640,295)	4,554,358	2,534,688	1,513
Beginning balance (in shares) at Mar. 31, 2022		165,091,533
Beginning balance at Mar. 31, 2022	1,434,299	$ 1,651	(5,636,993)	4,553,020	2,515,838	783
Increase (Decrease) in Shareholders' Equity
Net income (loss)	11,350				11,350
Equity in unrealized (losses) gains of investees	46					46
Common share grants (in shares)		49,000
Common share grants	836			836
Common share repurchases (in shares)		(478)
Common share repurchases	(4)			(4)
Common share forfeitures (in shares)		(1,600)
Common share forfeitures	(4)			(4)
Distributions	(1,651)		(1,651)
Ending balance (in shares) at Jun. 30, 2022		165,138,455
Ending balance at Jun. 30, 2022	1,444,872	$ 1,651	(5,638,644)	4,553,848	2,527,188	829
Increase (Decrease) in Shareholders' Equity
Net income (loss)	7,500				7,500
Equity in unrealized (losses) gains of investees	684					684
Common share grants (in shares)		384,500
Common share grants	976	$ 4		972
Common share repurchases (in shares)		(68,371)
Common share repurchases	(459)	$ (1)		(458)
Common share forfeitures (in shares)		(1,000)
Common share forfeitures	(4)			(4)
Distributions	(1,651)		(1,651)
Ending balance (in shares) at Sep. 30, 2022		165,453,584
Ending balance at Sep. 30, 2022	1,451,918	$ 1,654	(5,640,295)	4,554,358	2,534,688	1,513
Beginning balance (in shares) at Dec. 31, 2022		165,452,566
Beginning balance at Dec. 31, 2022	1,388,792	$ 1,655	(5,673,386)	4,554,861	2,503,279	2,383
Increase (Decrease) in Shareholders' Equity
Net income (loss)	25,950				25,950
Equity in unrealized (losses) gains of investees	(214)					(214)
Common share grants	514			514
Common share repurchases (in shares)		(4,971)
Common share repurchases	(46)			(46)
Common share forfeitures (in shares)		(1,600)
Common share forfeitures	(1)			(1)
Distributions	(33,090)		(33,090)
Ending balance (in shares) at Mar. 31, 2023		165,445,995
Ending balance at Mar. 31, 2023	1,381,905	$ 1,655	(5,706,476)	4,555,328	2,529,229	2,169
Beginning balance (in shares) at Dec. 31, 2022		165,452,566
Beginning balance at Dec. 31, 2022	1,388,792	$ 1,655	(5,673,386)	4,554,861	2,503,279	2,383
Increase (Decrease) in Shareholders' Equity
Net income (loss)	10,544
Equity in unrealized (losses) gains of investees	$ (244)
Common share repurchases (in shares)	(97,926,000)
Ending balance (in shares) at Sep. 30, 2023		165,772,040
Ending balance at Sep. 30, 2023	$ 1,301,950	$ 1,658	(5,772,661)	4,556,991	2,513,823	2,139
Beginning balance (in shares) at Mar. 31, 2023		165,445,995
Beginning balance at Mar. 31, 2023	1,381,905	$ 1,655	(5,706,476)	4,555,328	2,529,229	2,169
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(11,278)				(11,278)
Equity in unrealized (losses) gains of investees	215					215
Common share grants (in shares)		56,000
Common share grants	1,474			1,474
Common share repurchases (in shares)		(16,761)
Common share repurchases	(150)			(150)
Common share forfeitures (in shares)		(1,400)
Common share forfeitures	(2)			(2)
Distributions	(33,089)		(33,089)
Ending balance (in shares) at Jun. 30, 2023		165,483,834
Ending balance at Jun. 30, 2023	1,339,075	$ 1,655	(5,739,565)	4,556,650	2,517,951	2,384
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(4,128)				(4,128)
Equity in unrealized (losses) gains of investees	(245)					(245)
Common share grants (in shares)		382,000
Common share grants	1,003	$ 4		999
Common share repurchases (in shares)		(76,194)
Common share repurchases	(601)	$ (1)		(600)
Common share forfeitures (in shares)		(17,600)
Common share forfeitures	(58)			(58)
Distributions	(33,096)		(33,096)
Ending balance (in shares) at Sep. 30, 2023		165,772,040
Ending balance at Sep. 30, 2023	$ 1,301,950	$ 1,658	$ (5,772,661)	$ 4,556,991	$ 2,513,823	$ 2,139