CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands		Total	Series B Preferred Stock	Series C Preferred Stock	Preferred Stock Series B Preferred Stock	Preferred Stock Series C Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Deficit Series B Preferred Stock	Accumulated Deficit Series C Preferred Stock	Accumulated Other Comprehensive Income
Balance (in shares) at Dec. 31, 2021					8,000	11,000	108,138
Beginning balance at Dec. 31, 2021		$ 2,542,848			$ 80	$ 110	$ 1,082	$ 3,775,482	$ (1,279,484)			$ 45,578
Increase (Decrease) in Stockholders' Equity
Net income/(loss)		(82,906)							(82,906)
Issuance of stock, net of expenses (in shares)							150
Issuance of common stock, net of expenses		486					$ 1	485
Repurchase of shares of common stock (in shares)	[1]						(3,252)
Repurchase of shares of common stock	[1]	(55,742)					$ (33)	(55,709)
Equity based compensation expense		2,642						2,642
Change in accrued dividends attributable to stock-based awards		(76)						74	(150)
Dividends declared on common stock		(46,215)							(46,215)
Dividends declared on preferred stock			$ (3,750)	$ (4,469)						$ (3,750)	$ (4,469)
Dividends attributable to dividend equivalents		(141)							(141)
Change in unrealized gains on securities, net		(4,977)										(4,977)
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk		1,255										1,255
Balance (in shares) at Mar. 31, 2022					8,000	11,000	105,036
Ending balance at Mar. 31, 2022		2,348,955			$ 80	$ 110	$ 1,050	3,722,974	(1,417,115)			41,856
Balance (in shares) at Dec. 31, 2021					8,000	11,000	108,138
Beginning balance at Dec. 31, 2021		2,542,848			$ 80	$ 110	$ 1,082	3,775,482	(1,279,484)			45,578
Increase (Decrease) in Stockholders' Equity
Net income/(loss)		(183,273)
Dividends declared on preferred stock		(16,438)
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk		1,255
Balance (in shares) at Jun. 30, 2022					8,000	11,000	101,793
Ending balance at Jun. 30, 2022		2,146,388			$ 80	$ 110	$ 1,018	3,679,078	(1,570,817)			36,919
Balance (in shares) at Mar. 31, 2022					8,000	11,000	105,036
Beginning balance at Mar. 31, 2022		2,348,955			$ 80	$ 110	$ 1,050	3,722,974	(1,417,115)			41,856
Increase (Decrease) in Stockholders' Equity
Net income/(loss)		(100,367)							(100,367)
Issuance of stock, net of expenses (in shares)							38
Issuance of common stock, net of expenses		553					$ 1	552
Repurchase of shares of common stock (in shares)	[1]						(3,281)
Repurchase of shares of common stock	[1]	(47,512)					$ (33)	(47,479)
Equity based compensation expense		3,540						3,540
Change in accrued dividends attributable to stock-based awards		(662)						(509)	(153)
Dividends declared on common stock		(44,789)							(44,789)
Dividends declared on preferred stock		(8,219)	(3,750)	(4,469)						(3,750)	(4,469)
Dividends attributable to dividend equivalents		(174)							(174)
Change in unrealized gains on securities, net		(4,937)										(4,937)
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk		0
Balance (in shares) at Jun. 30, 2022					8,000	11,000	101,793
Ending balance at Jun. 30, 2022		2,146,388			$ 80	$ 110	$ 1,018	3,679,078	(1,570,817)			36,919
Balance (in shares) at Dec. 31, 2022					8,000	11,000	101,802
Beginning balance at Dec. 31, 2022		1,988,849			$ 80	$ 110	$ 1,018	3,684,291	(1,717,991)			21,341
Increase (Decrease) in Stockholders' Equity
Net income/(loss)		72,784							72,784
Issuance of stock, net of expenses (in shares)							168
Issuance of common stock, net of expenses		18					$ 1	17
Repurchase of shares of common stock (in shares)	[2]						(58)
Repurchase of shares of common stock	[2]	(599)					$ 0	(599)
Equity based compensation expense		3,019						3,019
Change in accrued dividends attributable to stock-based awards		(375)						557	(932)
Dividends declared on common stock		(35,669)							(35,669)
Dividends declared on preferred stock			(3,750)	(4,469)						(3,750)	(4,469)
Dividends attributable to dividend equivalents		(86)							(86)
Change in unrealized gains on securities, net		(1,116)										(1,116)
Balance (in shares) at Mar. 31, 2023					8,000	11,000	101,912
Ending balance at Mar. 31, 2023		2,018,606			$ 80	$ 110	$ 1,019	3,687,285	(1,690,113)			20,225
Balance (in shares) at Dec. 31, 2022					8,000	11,000	101,802
Beginning balance at Dec. 31, 2022		1,988,849			$ 80	$ 110	$ 1,018	3,684,291	(1,717,991)			21,341
Increase (Decrease) in Stockholders' Equity
Net income/(loss)		46,856
Dividends declared on preferred stock		(16,437)
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk		0
Balance (in shares) at Jun. 30, 2023					8,000	11,000	101,916
Ending balance at Jun. 30, 2023		1,944,769			$ 80	$ 110	$ 1,019	3,691,233	(1,761,093)			13,420
Balance (in shares) at Mar. 31, 2023					8,000	11,000	101,912
Beginning balance at Mar. 31, 2023		2,018,606			$ 80	$ 110	$ 1,019	3,687,285	(1,690,113)			20,225
Increase (Decrease) in Stockholders' Equity
Net income/(loss)		(25,928)							(25,928)
Issuance of stock, net of expenses (in shares)							4
Issuance of common stock, net of expenses		16					$ 0	16
Repurchase of shares of common stock (in shares)	[2]						0
Repurchase of shares of common stock	[2]	0					$ 0	0
Equity based compensation expense		3,932						3,932
Change in accrued dividends attributable to stock-based awards		(1,044)						0	(1,044)
Dividends declared on common stock		(35,671)							(35,671)
Dividends declared on preferred stock		(8,218)	$ (3,750)	$ (4,469)						$ (3,750)	$ (4,469)
Dividends attributable to dividend equivalents		(118)							(118)
Change in unrealized gains on securities, net		(6,805)										(6,805)
Changes in fair value of financing agreements at fair value due to changes in instrument-specific credit risk		0
Balance (in shares) at Jun. 30, 2023					8,000	11,000	101,916
Ending balance at Jun. 30, 2023		$ 1,944,769			$ 80	$ 110	$ 1,019	$ 3,691,233	$ (1,761,093)			$ 13,420

[1] For the six months ended June 30, 2022 includes approximately $1.0 million (56,690 shares) surrendered for tax purposes related to equity-based compensation awards.

[2] For the six months ended June 30, 2023 includes approximately $600,000 (58,505 shares) surrendered for tax purposes related to equity-based compensation awards.