CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (unaudited) - 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 at Dec. 31, 2018	$ 2,597,431	$ 1,644	$ (5,181,323)	$ 4,545,481	$ 3,231,895	$ (266)
Beginning balance (in shares) at Dec. 31, 2018		164,441,709
Increase (Decrease) in Shareholders' Equity
Net income (loss)	225,787				225,787
Equity interest in investee’s unrealized gains	66					66
Common share grants	436			436
Distributions	(87,154)		(87,154)
Ending balance at Mar. 31, 2019	2,736,566	$ 1,644	(5,268,477)	4,545,917	3,457,682	(200)
Ending balance (in shares) at Mar. 31, 2019		164,441,709
Beginning balance at Dec. 31, 2019	2,505,878	$ 1,646	(5,534,942)	4,547,529	3,491,645	0
Beginning balance (in shares) at Dec. 31, 2019		164,563,034
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(33,650)				(33,650)
Equity interest in investee’s unrealized gains	0
Common share grants	$ 602			602
Common share repurchases (in shares)	(2,637)	(2,637)
Common share repurchases	$ (55)			(55)
Common share grants (in shares)		6,000
Distributions	(90,509)		(90,509)
Ending balance at Mar. 31, 2020	$ 2,382,266	$ 1,646	$ (5,625,451)	$ 4,548,076	$ 3,457,995	$ 0
Ending balance (in shares) at Mar. 31, 2020		164,566,397