Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Mortgage-backed securities, at fair value (including pledged assets of $22,591,973 and $17,012,472 at December 31, 2012 and December 31, 2011, respectively)	$ 23,919,251	$ 17,741,873
Cash and cash equivalents	168,424	347,045
Restricted cash	281,021	237,014
Unsettled purchased mortgage-backed securities, at fair value	138,338	49,630
Receivable for securities sold	1,587,535
Accrued interest receivable	77,113	63,025
Principal payments receivable	190,832	105,333
Debt security, held to maturity, at cost	15,000	15,000
Other assets	26,604	27,799
Total assets	26,404,118	18,586,719
Liabilities and shareholders' equity
Repurchase agreements	22,866,429	16,162,375
Payable for unsettled securities	137,121	48,999
Accrued interest payable	7,592	4,596
Interest rate hedge liability	243,945	219,167
Dividend payable	73,804	69,141
Accounts payable and other liabilities	2,363	2,253
Total liabilities	23,331,254	16,506,531
Shareholders' equity:
7.625% Series A Cumulative Redeemable Preferred stock, $.001 par value, 25,000,000 shares authorized, 11,500,000 and 0 shares issued and outstanding at December 31, 2012 and 2011, respectively ($287,500 aggregate liquidation preference)	278,252
Common stock, $.001 par value, 200,000,000 shares authorized, 98,822,654 and 76,823,220 shares issued and outstanding at December 31, 2012 and 2011, respectively	99	77
Additional paid-in capital	2,494,303	1,904,748
Retained earnings	37,356	2,041
Accumulated other comprehensive income	262,854	173,322
Total shareholders' equity	3,072,864	2,080,188
Total liabilities and shareholders' equity	$ 26,404,118	$ 18,586,719