Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net income (loss)	$ 56,361us-gaap_NetIncomeLoss	$ (134,136)us-gaap_NetIncomeLoss	$ 349,245us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization of premium related to mortgage-backed securities	101,979	165,924	162,844
Reclassification of deferred swap loss	81,132	25,816
Amortization related to interest rate swap agreements	226	311	361
Share-based compensation expense	3,612us-gaap_ShareBasedCompensation	2,594us-gaap_ShareBasedCompensation	1,920us-gaap_ShareBasedCompensation
Hedge ineffectiveness		(205)	178
Net (gain) loss on sale of mortgage-backed securities	(5,196)	283,012	(64,347)
Impairment loss on mortgage-backed securities		8,102us-gaap_ImpairmentOfInvestments
Gain on mortgage loans held for investment	(8)us-gaap_GainLossOnSaleOfMortgageLoans
Net loss on derivative instruments	141,433	68,205
Changes in operating assets and liabilities:
(Increase) decrease in accrued interest receivable	882	21,957	(14,088)
Increase in other assets	(2,963)	(2,432)	(191)
Increase (decrease) in accrued interest payable	(1,311)	687	2,996
Increase in accounts payable and other liabilities	2,336	572	110
Net cash provided by operating activities	378,483	440,407	439,028
Investing activities
Purchases of mortgage-backed securities	(5,126,375)	(10,180,894)	(17,988,431)
Principal repayments on mortgage-backed securities	3,423,756	5,782,709	5,635,988
Sales of mortgage-backed securities	1,993,707	11,280,146	4,518,105
Purchases of mortgage loans	(31,462)
Principal repayments on mortgage loans	10
Net payments on derivative instruments	(53,192)	(67,656)
Purchase of equity investment	(6,000)
Purchase of broker/dealer	(1,349)
Net cash provided by (used in) investing activities	199,095	6,814,305	(7,834,338)
Financing activities
Issuance of preferred stock			278,252
Issuance (repurchase) of common stock	(1,912)	(43,881)	587,657
Cash dividends paid	(215,098)us-gaap_PaymentsOfDividends	(283,309)us-gaap_PaymentsOfDividends	(309,267)us-gaap_PaymentsOfDividends
Proceeds from repurchase agreements	151,439,951us-gaap_ProceedsFromOtherShortTermDebt	226,824,755us-gaap_ProceedsFromOtherShortTermDebt	231,718,347us-gaap_ProceedsFromOtherShortTermDebt
Principal repayments on repurchase agreements	(151,809,803)us-gaap_RepaymentsOfOtherShortTermDebt	(233,561,501)us-gaap_RepaymentsOfOtherShortTermDebt	(225,014,293)us-gaap_RepaymentsOfOtherShortTermDebt
Proceeds from dollar roll financing	241,121us-gaap_ProceedsFromShortTermDebt	1,784,998us-gaap_ProceedsFromShortTermDebt
Repayments on dollar roll financing	(592,947)	(1,433,172)
Payment on termination of interest rate swaps		(3,342)
Net cash provided by (used in) financing activities	(938,688)	(6,715,452)	7,260,696
Net increase (decrease) in cash and cash equivalents	(361,110)	539,260	(134,614)
Cash and cash equivalents, beginning of period	988,705	449,445	584,059
Cash and cash equivalents, end of period	627,595	988,705	449,445
Supplemental disclosure of cash flow information
Cash paid for interest	166,368us-gaap_InterestPaid	197,022us-gaap_InterestPaid	194,068us-gaap_InterestPaid
Supplemental schedule of non-cash investing and financing activities
Obligation to brokers for purchase of unsettled mortgage-backed securities	24,750		722,221
Receivable for securities sold	5,197	231,214	1,587,535
Dividends accrued not yet paid	53,014	52,929
Redeemable Preferred Stock
Supplemental schedule of non-cash investing and financing activities
Dividends accrued not yet paid	4,628	4,628	4,628
Common Stock
Supplemental schedule of non-cash investing and financing activities
Dividends accrued not yet paid	$ 48,386	$ 48,301	$ 69,176

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The amount of expense charged against earnings by an Entity to record deferred gains and losses on hedge instruments. Examples include gain on economic hedges, amortization of gain on designated fair value hedge and so forth.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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