CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Agency MBS:
Agency MBS pledged to counterparties at fair value	$ 6,912,185	$ 8,060,567
Agency MBS at fair value	458,398	462,478
Paydowns receivable	40,669	33,401
Available-for-sale Securities, Total	7,411,252	8,556,446
Residential properties	12,362
Cash and cash equivalents	1,402	7,368
Interest and dividends receivable	20,069	23,310
Derivative instruments at fair value	662,095	22,551
Prepaid expenses and other	9,972	9,816
Total Assets:	8,117,152	8,619,491
Liabilities:
Accrued interest payable	11,835	30,117
Repurchase agreements	6,550,000	7,580,000
Junior subordinated notes	37,380	37,380
Derivative instruments at fair value	671,288	55,914
Accrued expenses and other	4,299	1,368
Total Liabilities:	7,292,829	7,717,305
Stockholders' Equity:
Series A Cumulative Preferred Stock: par value $0.01 per share; liquidating preference $25.00 per share ($47,984 and $47,984, respectively); 1,919 and 1,919 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	46,537	46,537
Common Stock: par value $0.01 per share; authorized 200,000 shares, 118,554 and 138,717 issued and outstanding at September 30, 2014 and December 31, 2013, respectively	1,186	1,387
Additional paid-in capital	1,076,185	1,185,369
Accumulated other comprehensive (loss) consisting of unrealized gains and losses	(46,469)	(92,008)
Accumulated deficit	(277,040)	(263,023)
Total Stockholders' Equity:	800,399	878,262
Total Liabilities and Stockholders' Equity:	8,117,152	8,619,491
Series A Preferred Stock
Liabilities:
Dividends payable on stock	1,035	1,035
Stockholders' Equity:
Total Stockholders' Equity:	46,537	46,537
Series B Preferred Stock
Liabilities:
Dividends payable on stock	394	394
Common Stock
Liabilities:
Dividends payable on stock	$ 16,598	$ 11,097