Statements of Cash Flows (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Operating activities
Net income	$ 134,766	$ 80,546
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization of premium related to mortgage-backed securities	30,610	20,534
Amortization related to interest rate swap agreements	151	110
Share based compensation expense	401	690
Hedge ineffectiveness	386	261
Gain on sale of mortgage-backed securities	(4,405)	(1,044)
Changes in operating assets and liabilities:
(Increase) decrease in accrued interest receivable	(22,529)	4,055
Increase in other assets	(1,200)	(4,299)
Decrease in accrued interest payable	(606)	(475)
Increase (decrease) in accounts payable and other liabilities	125	(687)
Net cash provided by operating activities	137,699	99,691
Investing activities
Purchases of mortgage-backed securities	(8,394,241)	(1,137,688)
Principal repayments of mortgage-backed securities	1,267,891	1,323,000
Sale of mortgage-backed securities	360,203	30,529
Net cash (used in) provided by investing activities	(6,766,147)	215,841
Financing activities
Issuance of common stock, net of cost of issuance	817,736	32,974
Cash dividends paid	(104,188)	(87,206)
Increase in restricted cash	(84,047)	(33,653)
Proceeds from repurchase agreements	72,246,435	35,332,262
Principal repayments on repurchase agreements	(66,126,901)	(35,695,782)
Net cash provided by (used in) financing activities	6,749,035	(451,405)
Net increase (decrease) in cash and cash equivalents	120,587	(135,873)
Cash and cash equivalents, beginning of period	112,626	225,828
Cash and cash equivalents, end of period	233,213	89,955
Supplemental disclosure of cash flow information
Cash paid during the period for interest	62,709	47,593
Supplemental schedule of non-cash financing activities
Obligation to brokers incurred for purchase of mortgage-backed securities	$ 260,415	$ 850,634

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages).

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