Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets
Mortgage-backed securities, at fair value (including pledged assets of $21,178,062 and $17,012,472 at June 30, 2012 and December 31, 2011, respectively)	$ 22,367,121	$ 17,741,873
Cash and cash equivalents	288,691	347,045
Restricted cash	278,178	237,014
Unsettled purchased mortgage-backed securities, at fair value	829,060	49,630
Accrued interest receivable	73,856	63,025
Principal payments receivable	138,712	105,333
Debt security, held to maturity, at cost	15,000	15,000
Other assets	27,702	27,799
Total assets	24,018,320	18,586,719
Liabilities and shareholders' equity
Repurchase agreements	20,152,860	16,162,375
Payable for unsettled securities	827,732	48,999
Accrued interest payable	4,393	4,596
Interest rate hedge liability	250,933	219,167
Dividend payable	88,267	69,141
Accounts payable and other liabilities	1,874	2,253
Total liabilities	21,326,059	16,506,531
Shareholders' equity:
Preferred stock, $.001 par value, 10,000,000 shares authorized, none outstanding at June 30, 2012 and December 31, 2011
Common stock, $.001 par value, 200,000,000 shares authorized, 98,074,404 and 76,823,220 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively	98	77
Additional paid-in capital	2,476,170	1,904,748
Retained earnings	2,333	2,041
Accumulated other comprehensive income	213,660	173,322
Total shareholders' equity	2,692,261	2,080,188
Total liabilities and shareholders' equity	$ 24,018,320	$ 18,586,719