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) Common 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	Common Stock	Total
Beginning Balance at Dec. 31, 2018		$ 985	$ 981,964	$ (28,824)	$ 9,563	$ (11,531)					$ (485,988)			$ 46,537		$ 48,944		$ 561,650
Beginning Balance (in shares) at Dec. 31, 2018	98,483											1,919	2,010
Issuance of stock		1	355															356
Issuance of stock (in shares)	82
Other comprehensive income, fair value adjustments and reclassifications				31,278	8,165	1,003												40,446
Net (loss) income											(19,970)							(19,970)
Amortization of restricted stock			25															25
Dividends declared preferred stock							$ (1,035)	$ (304)	$ (958)					(1,035)	$ (304)	(958)
Dividend declared per common share											(12,815)							(12,815)
Ending Balance at Mar. 31, 2019		986	982,344	2,454	17,728	(10,528)					(521,070)			46,537		48,944		567,395
Ending Balance (in shares) at Mar. 31, 2019	98,565											1,919	2,010
Beginning Balance at Dec. 31, 2018		985	981,964	(28,824)	9,563	(11,531)					(485,988)			46,537		48,944		561,650
Beginning Balance (in shares) at Dec. 31, 2018	98,483											1,919	2,010
Other comprehensive income, fair value adjustments and reclassifications																		79,406
Net (loss) income																		(67,670)
Dividends declared preferred stock																		(4,595)
Ending Balance at Jun. 30, 2019		987	982,770	30,832	27,299	(9,517)					(581,922)			46,537		48,626		545,612
Ending Balance (in shares) at Jun. 30, 2019	98,683											1,919	2,010
Beginning Balance at Mar. 31, 2019		986	982,344	2,454	17,728	(10,528)					(521,070)			46,537		48,944		567,395
Beginning Balance (in shares) at Mar. 31, 2019	98,565											1,919	2,010
Issuance of stock		1	401															402
Issuance of stock (in shares)	118
Other comprehensive income, fair value adjustments and reclassifications				28,378	9,571	1,011												38,960
Net (loss) income											(47,700)							(47,700)
Amortization of restricted stock			25															25
Amortization of shelf offering expenses																(318)		(318)
Dividends declared preferred stock							(1,035)	(304)	(958)					(1,035)	(304)	(958)		(2,297)
Dividend declared per common share										$ (10,855)							$ (10,855)
Ending Balance at Jun. 30, 2019		987	982,770	30,832	27,299	(9,517)					(581,922)			46,537		48,626		545,612
Ending Balance (in shares) at Jun. 30, 2019	98,683											1,919	2,010
Cumulative adjustment for adoption of ASC 326											(30)							(30)
Balance including adjustment at January 1, 2020		988	983,401	43,590	30,034	(7,640)					(593,069)			46,537		48,626		552,467
Beginning Balance at Dec. 31, 2019		988	983,401	43,590	30,034	(7,640)					(593,039)			46,537		48,626		552,497
Beginning Balance (in shares) at Dec. 31, 2019	98,849											1,919	2,010
Issuance of stock		1	264															265
Issuance of stock (in shares)	87
Other comprehensive income, fair value adjustments and reclassifications				29,121	(30,034)	889												(24)
Net (loss) income											(185,821)							(185,821)
Amortization of restricted stock			4															4
Dividends declared preferred stock							(1,035)	(304)	(958)					(1,035)	(304)	(958)
Ending Balance at Mar. 31, 2020		989	983,669	72,711		(6,751)					(781,187)			46,537		48,626		364,594
Ending Balance (in shares) at Mar. 31, 2020	98,936											1,919	2,010
Beginning Balance at Dec. 31, 2019		988	983,401	43,590	$ 30,034	(7,640)					(593,039)			46,537		48,626		552,497
Beginning Balance (in shares) at Dec. 31, 2019	98,849											1,919	2,010
Other comprehensive income, fair value adjustments and reclassifications																		(8,632)
Net (loss) income																		(148,981)
Dividends declared preferred stock																		(4,595)
Ending Balance at Jun. 30, 2020		990	983,832	63,139		(5,787)					(756,545)			46,537		48,626		380,792
Ending Balance (in shares) at Jun. 30, 2020	99,047											1,919	2,010
Beginning Balance at Mar. 31, 2020		989	983,669	72,711		(6,751)					(781,187)			46,537		48,626		364,594
Beginning Balance (in shares) at Mar. 31, 2020	98,936											1,919	2,010
Issuance of stock		1	159															160
Issuance of stock (in shares)	111
Other comprehensive income, fair value adjustments and reclassifications				(9,572)		964												(8,608)
Net (loss) income											36,839							36,839
Amortization of restricted stock			4															4
Dividends declared preferred stock							$ (1,035)	$ (305)	$ (958)					(1,035)	$ (305)	(958)		(2,297)
Dividend declared per common share										$ (9,899)							$ (9,899)
Ending Balance at Jun. 30, 2020		$ 990	$ 983,832	$ 63,139		$ (5,787)					$ (756,545)			$ 46,537		$ 48,626		$ 380,792
Ending Balance (in shares) at Jun. 30, 2020	99,047											1,919	2,010