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 (Loss) [Member]
Beginning Balance at Dec. 31, 2018	$ 1,059,063	$ 250,946	$ 853	$ 1,174,880	$ (346,570)	$ (21,046)
Net loss	(7,746)				(7,746)
Change in unrealized gain on mortgage securities, net	43,476					43,476
Amounts related to cash flow hedges, net	(19,122)					(19,122)
Cash dividends:
Common	(6,952)				(6,952)
Preferred	(4,842)				(4,842)
Other additions to capital	1,001		3	998
Ending Balance at Mar. 31, 2019	1,064,878	250,946	856	1,175,878	(366,110)	3,308
Beginning Balance at Dec. 31, 2019	1,073,733	250,946	946	1,252,481	(444,039)	13,399
Net loss	(204,653)				(204,653)
Change in unrealized gain on mortgage securities, net	1,094					1,094
Amounts related to cash flow hedges, net	(20,771)					(20,771)
Cash dividends:
Common	(14,519)				(14,519)
Preferred	(4,842)				(4,842)
Issuance of common stock	12,857		16	12,841
Other additions to capital	725		2	723
Ending Balance at Mar. 31, 2020	$ 843,624	$ 250,946	$ 964	$ 1,266,045	$ (668,053)	$ (6,278)