CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2018	$ 1,059,063	$ 250,946	$ 853	$ 1,174,880	$ (346,570)	$ (21,046)
Net income (loss)	(71,206)				(71,206)
Change in unrealized gain on mortgage securities, net	92,026					92,026
Amounts related to cash flow hedges, net	(32,219)					(32,219)
Cash dividends:
Common	(17,243)				(17,243)
Preferred	(9,684)				(9,684)
Other additions to capital	1,651		2	1,649
Ending Balance at Jun. 30, 2019	1,022,388	250,946	855	1,176,529	(444,703)	38,761
Beginning Balance at Mar. 31, 2019	1,064,878	250,946	856	1,175,878	(366,110)	3,308
Net income (loss)	(63,460)				(63,460)
Change in unrealized gain on mortgage securities, net	48,550					48,550
Amounts related to cash flow hedges, net	(13,097)					(13,097)
Cash dividends:
Common	(10,291)				(10,291)
Preferred	(4,842)				(4,842)
Other additions to capital	650		(1)	651
Ending Balance at Jun. 30, 2019	1,022,388	250,946	855	1,176,529	(444,703)	38,761
Beginning Balance at Dec. 31, 2019	1,073,733	250,946	946	1,252,481	(444,039)	13,399
Net income (loss)	(181,949)				(181,949)
Change in unrealized gain on mortgage securities, net	65,753					65,753
Amounts related to cash flow hedges, net	(20,400)					(20,400)
Cash dividends:
Common	(29,077)				(29,077)
Preferred	(9,684)				(9,684)
Issuance of common stock	12,857		16	12,841
Other additions to capital	1,656		2	1,654
Ending Balance at Jun. 30, 2020	912,889	250,946	964	1,266,976	(664,749)	58,752
Beginning Balance at Mar. 31, 2020	843,624	250,946	964	1,266,045	(668,053)	(6,278)
Net income (loss)	22,704				22,704
Change in unrealized gain on mortgage securities, net	64,659					64,659
Amounts related to cash flow hedges, net	371					371
Cash dividends:
Common	(14,558)				(14,558)
Preferred	(4,842)				(4,842)
Other additions to capital	931			931
Ending Balance at Jun. 30, 2020	$ 912,889	$ 250,946	$ 964	$ 1,266,976	$ (664,749)	$ 58,752