CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash Flows From Operating Activities:
Net income	$ 154,914	$ 152,824
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sales of MBS and U.S. Treasury securities	(11,423)	(5,998)
Accretion of purchase discounts on MBS and other investments	(48,433)	(28,762)
Amortization of purchase premiums on MBS	17,678	31,301
Depreciation and amortization on fixed assets and other assets	657	2,160
Equity-based compensation expense	3,086	2,186
Unrealized gains on derivative instruments	(4,094)	(466)
Decrease in interest receivable	1,144	3,142
Increase in prepaid and other assets	(15,935)	(12,088)
(Decrease)/increase in accrued expenses and other liabilities, and excise tax and interest	(1,185)	1,720
Increase/(decrease) in accrued interest payable on financial instruments	18,553	(4,773)
Net cash provided by operating activities	114,962	141,246
Cash Flows From Investing Activities:
Principal payments on MBS and other investments	935,415	1,483,476
Proceeds from sale of MBS and U.S. Treasury securities	42,029	216,079
Purchases of MBS and other investments	(955,975)	(1,251,726)
Additions to leasehold improvements, furniture and fixtures	(221)	(135)
Net cash provided by investing activities	21,248	447,694
Cash Flows From Financing Activities:
Principal payments on repurchase agreements	(41,172,586)	(39,284,004)
Proceeds from borrowings under repurchase agreements	41,217,390	39,440,815
Principal payments on securitized debt	(151,296)	(203,068)
Payments made on obligation to return securities obtained as collateral	0	(300,119)
Cash disbursements on financial instruments underlying Linked Transactions	(1,139,692)	(114,903)
Cash received from financial instruments underlying Linked Transactions	1,065,107	117,554
Payments made for margin calls on repurchase agreements and Swaps	(87,700)	(3)
Proceeds from reverse margin calls on repurchase agreements and Swaps	48,400	2,000
Proceeds from issuances of common stock	16,846	40,398
Payments made for redemption of Series A Preferred Stock	0	(96,000)
Proceeds from issuance of Series B Preferred Stock	0	200,000
Payments made for preferred stock offering costs	0	(6,684)
Dividends paid on preferred stock	(7,500)	(6,250)
Dividends paid on common stock and DERs	(146,830)	(331,687)
Net cash used in financing activities	(357,861)	(541,951)
Net (decrease)/increase in cash and cash equivalents	(221,651)	46,989
Cash and cash equivalents at beginning of period	565,370	401,293
Cash and cash equivalents at end of period	343,719	448,282
Non-cash Investing and Financing Activities:
Net increase in securities obtained as collateral/obligation to return securities obtained as collateral	50,375	200,098
Dividends and DERs declared and unpaid	$ 74,104	$ 80,440