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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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ASSETS |  |
Pledged MBS | $ 3,265,979 us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue | $ 3,873,584 us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
Common stock, par value | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized | 200,000,000 us-gaap_CommonStockSharesAuthorized | 200,000,000 us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued | 54,739,111 us-gaap_CommonStockSharesIssued | 54,310,484 us-gaap_CommonStockSharesIssued
Common stock, shares outstanding | 54,739,111 us-gaap_CommonStockSharesOutstanding | 54,310,484 us-gaap_CommonStockSharesOutstanding
Series A Preferred Stock [Member] |  |
ASSETS |  |
Preferred Stock, Par Value Per Share | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Preferred Stock, Shares Authorized | 8,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 8,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Preferred Stock, Shares Issued | 2,300,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 2,300,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Preferred Stock, Shares Outstanding | 2,300,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 2,300,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Preferred Stock, aggregate liquidation preference | 57,500 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 57,500 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Series B Preferred Stock [Member] |  |
ASSETS |  |
Preferred Stock, Par Value Per Share | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred Stock, Shares Authorized | 7,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 7,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred Stock, Shares Issued | 2,250,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 2,250,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred Stock, Shares Outstanding | 2,250,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 2,250,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred Stock, aggregate liquidation preference | $ 56,250 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 56,250 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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