CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock Shares Outstanding	Common Stock	Additional Paid-In Capital	Accum. Other Comp. Income Gain (Loss) Agency MBS	Accum. Other Comp. Income gain (Loss) Non-Agency MBS	Accum. Other Comp. Income Gain (Loss) Derivatives	Accum. (Deficit) Series A Preferred Stock	Accum. (Deficit) Series B Preferred Stock	Accum. (Deficit) Series C Preferred Stock	Accum. (Deficit)	Series A Preferred Stock Shares Outstanding	Series C Preferred Stock Shares Outstanding	Series A Preferred Stock	Series B Preferred Stock	Series C Preferred Stock	Total
Beginning Balance at Dec. 31, 2016		$ 957	$ 966,714	$ 24,869	$ 1,536	$ (17,757)				$ (403,079)			$ 46,537		$ 11,321	$ 631,098
Beginning Balance (in shares) at Dec. 31, 2016	95,718										1,919	486
Issuance of Preferred Stock															37,099	37,099
Issuance of Preferred Stock (in shares)												1,503
Issuance of stock		6	3,943													3,949
Issuance of stock (in shares)	642
Cancellation of common stock		(2)	2
Cancellation of common stock (in shares)	(197)
Conversions of Series B Preferred Stock		20	9,503													9,523
Conversions of Series B Preferred Stock (in shares)	1,974
Other comprehensive income, fair value adjustments and reclassifications				(22,706)	28,665	2,413										8,372
Net (loss) income										54,372						54,372
Amortization of restricted stock			81													81
Dividends on preferred stock							$ (4,139)	$ (1,188)	$ (2,841)				(4,139)	$ (1,188)	(2,841)
Dividend declared per common share										(58,360)						(58,360)
Ending Balance at Dec. 31, 2017		981	980,243	2,163	30,201	(15,344)				(415,235)			46,537		48,420	677,966
Ending Balance (in shares) at Dec. 31, 2017	98,137										1,919	1,989
Issuance of Preferred Stock															524	524
Issuance of Preferred Stock (in shares)												21
Issuance of stock		4	1,623													1,627
Issuance of stock (in shares)	346
Other comprehensive income, fair value adjustments and reclassifications				(30,987)	(20,638)	3,813										(47,812)
Net (loss) income										(6,488)						(6,488)
Amortization of restricted stock			98													98
Dividends on preferred stock							(4,140)	(1,220)	(3,833)				(4,140)	(1,220)	(3,833)
Dividend declared per common share										(55,072)						(55,072)
Ending Balance at Dec. 31, 2018		985	981,964	(28,824)	9,563	(11,531)				(485,988)			46,537		48,944	561,650
Ending Balance (in shares) at Dec. 31, 2018	98,483										1,919	2,010
Issuance of stock		3	1,359													1,362
Issuance of stock (in shares)	366
Other comprehensive income, fair value adjustments and reclassifications				72,414	20,471	3,891										96,776
Net (loss) income										(55,419)						(55,419)
Amortization of restricted stock			78													78
Amortization of shelf offering expenses															(318)	(318)
Dividends on preferred stock							$ (4,140)	$ (1,220)	$ (3,829)				(4,140)	$ (1,220)	(3,829)
Dividend declared per common share										(42,443)						(42,443)
Ending Balance at Dec. 31, 2019		$ 988	$ 983,401	$ 43,590	$ 30,034	$ (7,640)				$ (593,039)			$ 46,537		$ 48,626	$ 552,497
Ending Balance (in shares) at Dec. 31, 2019	98,849										1,919	2,010