Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Mortgage-backed securities, at fair value (including pledged assets of $24,857,784 and $17,012,472 at September 30, 2012 and December 31, 2011, respectively)	$ 26,375,137	$ 17,741,873
Cash and cash equivalents	150,846	347,045
Restricted cash	302,180	237,014
Unsettled purchased mortgage-backed securities, at fair value	120,478	49,630
Accrued interest receivable	80,056	63,025
Principal payments receivable	182,195	105,333
Debt security, held to maturity, at cost	15,000	15,000
Other assets	49,795	27,799
Total assets	27,275,687	18,586,719
Liabilities and shareholders' equity
Repurchase agreements	23,583,180	16,162,375
Payable for unsettled securities	118,925	48,999
Accrued interest payable	4,729	4,596
Interest rate hedge liability	273,120	219,167
Dividend payable	81,118	69,141
Accounts payable and other liabilities	2,059	2,253
Total liabilities	24,063,131	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 September 30, 2012 and December 31, 2011, respectively ($287,500 aggregate liquidation preference)	278,263
Common stock, $.001 par value, 200,000,000 shares authorized, 98,809,404 and 76,823,220 shares issued and outstanding at September 30, 2012 and December 31, 2011, respectively	99	77
Additional paid-in capital	2,493,704	1,904,748
Retained earnings	5,266	2,041
Accumulated other comprehensive income	435,224	173,322
Total shareholders' equity	3,212,556	2,080,188
Total liabilities and shareholders' equity	$ 27,275,687	$ 18,586,719