CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Mortgage-backed securities ("MBS"):
Agency MBS, at fair value ($6,747,299 and $6,666,963 pledged as collateral, respectively)	$ 7,225,460		$ 7,137,531
Non-Agency MBS, at fair value ($1,602,953 and $692,534 pledged as collateral, respectively)	2,762,006		1,492,376
Non-Agency MBS transferred to consolidated variable interest entities ("VIEs")	2,620,159	[1]	2,283,070	[1]
Securities obtained and pledged as collateral, at fair value	408,833		306,401
Cash and cash equivalents	401,293		394,022
Restricted cash	5,016		15,502
MBS linked transactions, net ("Linked Transactions"), at fair value	12,704		55,801
Interest receivable	44,033		42,837
Derivative hedging instruments, at fair value	203		26
Goodwill	7,189		7,189
Prepaid and other assets	30,654		15,879
Total Assets	13,517,550		11,750,634
Liabilities:
Repurchase agreements	8,752,472		7,813,159
Securitized debt	646,816	[2]	875,520	[2]
Obligation to return securities obtained as collateral, at fair value	508,827		306,401
8% Senior Notes due 2042 ("Senior Notes")	100,000
Accrued interest payable	16,104		9,112
Derivative hedging instruments, at fair value	63,034		114,220
Dividends and dividend equivalents rights ("DERs") payable	72,222		97,525
Payable for unsettled purchases	33,479		27,056
Excise tax and interest payable	7,500
Accrued expenses and other liabilities	6,090		9,881
Total Liabilities	10,206,544		9,252,874
Commitments and contingencies (Note 10)
Stockholders' Equity:
Preferred stock, $.01 par value; Series A 8.50% cumulative redeemable; 5,000 shares authorized; 3,840 shares issued and outstanding ($96,000 aggregate liquidation preference)	38		38
Common stock, $.01 par value; 895,000 shares authorized; 357,546 and 356,112 shares issued and outstanding, respectively	3,575		3,561
Additional paid-in capital, in excess of par	2,805,724		2,795,925
Accumulated deficit	(260,308)		(243,061)
Accumulated other comprehensive income/(loss)	761,977		(58,703)
Total Stockholders' Equity	3,311,006		2,497,760
Total Liabilities and Stockholders' Equity	$ 13,517,550		$ 11,750,634

[1] Non-Agency MBS transferred to consolidated VIEs represent assets of consolidated VIEs that can be used only to settle the obligations of each respective VIE.

[2] Securitized Debt represents third-party liabilities of consolidated VIEs and excludes liabilities of the VIEs acquired by the Company that eliminate on consolidation. The third-party beneficial interest holders in the VIEs have no recourse to the general credit of the Company. (See Notes 10 and 15 for further discussion.)