CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock Par Value	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Cumulative Earnings	Cumulative Distributions to Stockholders	Series A Preferred Stock Par Value	Series A Preferred Stock Par Value Preferred Stock	Series B Preferred Stock Par Value	Series B Preferred Stock Par Value Preferred Stock	Series C Preferred Stock Par Value	Series C Preferred Stock Par Value Preferred Stock	Series D Preferred Stock Par Value	Series D Preferred Stock Par Value Preferred Stock
Beginning Balance at Dec. 31, 2018	$ 3,703,829	$ 1,871	$ 4,072,093	$ 626,832	$ 3,379,489	$ (4,376,748)		$ 58		$ 130		$ 104		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	118,147				118,147
Other comprehensive income (loss)	46,156			46,156
Stock based compensation	2,682		2,682
Common dividends declared	(93,613)					(93,613)
Preferred dividends declared	(17,392)					(17,392)	$ (3,000)		$ (7,000)		$ (5,000)
Issuance of preferred stock	193,368		193,288											80
Ending Balance at Mar. 31, 2019	3,953,177	1,871	4,268,063	672,988	3,497,636	(4,487,753)		58		130		104		80
Beginning Balance at Dec. 31, 2019	3,953,293	1,873	4,275,963	708,336	3,793,040	(4,826,291)		58		130		104		80
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(370,755)				(370,755)
Other comprehensive income (loss)	(205,845)			(205,845)
Repurchase of common stock	(22,065)	(14)	(22,051)
Stock based compensation		1	1,142
Common dividends declared	(93,479)					(93,479)
Preferred dividends declared	(18,438)					(18,438)	$ (3,000)		$ (7,000)		$ (5,000)		$ (4,000)
Ending Balance at Mar. 31, 2020	$ 3,243,854	$ 1,860	$ 4,255,054	$ 502,491	$ 3,422,285	$ (4,938,208)		$ 58		$ 130		$ 104		$ 80