Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Income:
Agency Securities, net of amortization of premium and fees		$ 382,811	$ 218,391	$ 196,301
Total Interest Income		439,565	283,148	254,433
Interest expense- repurchase agreements		(288,229)	(154,230)	(94,558)
Net Interest Income		151,336	128,918	159,875
Other Income (Loss):
Realized gain (loss) on sale of Agency Securities (reclassified from Other comprehensive income (loss))		9,611	(152,950)	(8,486)
Other than temporary impairment of Agency Securities (reclassified from Other comprehensive income (loss))		0	(12,090)	(13,707)
Subtotal		(12,638)	(199,678)	40,513
Realized loss on derivatives	[1]	(213,996)	(47,497)	(22,675)
Unrealized gain (loss) on derivatives		(136,127)	49,316	39,272
Subtotal		(350,123)	1,819	16,597
Total Other Income (Loss)		(362,761)	(197,859)	57,110
Expenses:
Management fees		29,571	27,246	26,582
Professional fees		2,808	4,978	4,578
Insurance		713	660	836
Compensation		3,889	3,774	2,298
Other		1,499	367	1,537
Total Expenses		38,480	37,025	35,831
Net Income (Loss)		(249,905)	(105,966)	181,154
Dividends on preferred stock		(15,634)	(17,032)	(15,880)
Net Income (Loss) available (related) to common stockholders		$ (265,539)	$ (122,998)	$ 165,274
Net Income (Loss) per share available (related) to common stockholders (Note 12):
Basic (in dollars per share)		$ (4.59)	$ (2.92)	$ 4.22
Diluted (in dollars per share)		(4.59)	(2.92)	4.17
Dividends declared per common share (in dollars per share)		$ 2.16	$ 2.28	$ 2.28
Weighted average common shares outstanding:
Basic (in shares)		57,833	42,128	39,170
Diluted (in shares)		57,833	42,128	39,642
Credit Risk and Non-Agency Securities
Interest Income:
Debt securities, trading		$ 52,919	$ 56,427	$ 55,969
Other Income (Loss):
Debt securities, trading		(24,396)	(27,266)	65,672
Interest-Only Securities
Interest Income:
Debt securities, trading		596	1,667	2,163
Other Income (Loss):
Debt securities, trading		123	(1,007)	(2,966)
U.S. Treasury Securities
Interest Income:
Debt securities, trading		1,353	4,644	0
Other Income (Loss):
Debt securities, trading		2,024	(6,365)	0
Corporate Debt Securities
Interest Income:
Debt securities, trading		$ 1,886	$ 2,019	$ 0

[1] Interest expense related to our interest rate swap contracts is recorded as realized loss on derivatives on the consolidated statements of operations. For additional information, see Note 8 to the consolidated financial statements.