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, 2019	$ 1,073,733	$ 250,946	$ 946	$ 1,252,481	$ (444,039)	$ 13,399
Net income (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)
Beginning Balance at Dec. 31, 2020	910,163	250,946	965	1,268,439	(651,071)	40,884
Net income (loss)	18,942				18,942
Change in unrealized gain on mortgage securities, net	(21,483)					(21,483)
Amounts related to cash flow hedges, net	14,908					14,908
Cash dividends:
Common	(14,580)				(14,580)
Preferred	(4,842)				(4,842)
Other additions to capital	585		3	582
Ending Balance at Mar. 31, 2021	$ 903,693	$ 250,946	$ 968	$ 1,269,021	$ (651,551)	$ 34,309