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)	176,907				176,907
Other comprehensive income (loss)	112,258			112,258
Stock based compensation	6,621	1	6,620
Common dividends declared	(188,204)					(188,204)
Preferred dividends declared	(35,829)					(35,829)
Issuance of preferred stock	193,368		193,288											80
Ending Balance at Jun. 30, 2019	3,968,950	1,872	4,272,001	739,090	3,556,396	(4,600,781)		58		130		104		80
Beginning 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	58,760				58,760
Other comprehensive income (loss)	66,102			66,102
Stock based compensation	3,939	1	3,938
Common dividends declared	(94,590)					(94,590)
Preferred dividends declared	(18,438)					(18,438)	$ (6,000)		$ (13,000)		$ (10,000)		$ (7,000)
Ending Balance at Jun. 30, 2019	3,968,950	1,872	4,272,001	739,090	3,556,396	(4,600,781)		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)	(425,710)				(425,710)
Other comprehensive income (loss)	(170,826)			(170,826)
Repurchase of common stock	(22,066)	(14)	(22,052)
Settlement of Convertible Debt	292,809	460	292,349
Purchase of Capped Call	(33,750)		(33,750)
Stock based compensation	2,534	1	2,533
Common dividends declared	(163,530)					(163,530)
Preferred dividends declared	(36,875)					(36,875)	(6,000)		(13,000)		(10,000)		(8,000)
Ending Balance at Jun. 30, 2020	3,395,879	2,320	4,515,043	537,510	3,367,330	(5,026,696)		58		130		104		80
Beginning 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(54,955)				(54,955)
Other comprehensive income (loss)	35,019			35,019
Settlement of Convertible Debt	292,809	460	292,349
Purchase of Capped Call	(33,750)		(33,750)
Stock based compensation	1,390		1,390
Common dividends declared	(70,050)					(70,050)
Preferred dividends declared	(18,438)					(18,438)	$ (3,000)		$ (7,000)		$ (5,000)		$ (4,000)
Ending Balance at Jun. 30, 2020	$ 3,395,879	$ 2,320	$ 4,515,043	$ 537,510	$ 3,367,330	$ (5,026,696)		$ 58		$ 130		$ 104		$ 80