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Real Estate Securities Schedule of Real Estate Securities by Weighted Average Life (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | $ 1,472,791 | $ 13,596
Non-Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 34,467 | 13,596
Investment Owned, at Cost | 33,823 | 13,490
Weighted Average Coupon Rate, Percent | 2.88% | 2.20%
Less than three years [Member] | Non-Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 4,616 | 3,036
Investment Owned, at Cost | 4,291 | 3,001
Weighted Average Coupon Rate, Percent | 1.97% | 5.57%
Greater than three years and less than seven years [Member] | Non-Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 18,188 | 3,994
Investment Owned, at Cost | 18,244 | 3,978
Weighted Average Coupon Rate, Percent | 3.41% | 0.61%
Greater than seven years and less than eleven years [Member] | Non-Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 10,963 | 3,601
Investment Owned, at Cost | 10,477 | 3,608
Weighted Average Coupon Rate, Percent | 1.88% | 1.10%
Greater than eleven years [Member] | Non-Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 700 | 2,965
Investment Owned, at Cost | 811 | 2,903
Weighted Average Coupon Rate, Percent | 7.69% | 2.49%
Fixed Rate [Member] | Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 1,425,602 |
Investment Owned, at Cost | 1,442,897 |
Weighted Average Coupon Rate, Percent | 3.59% |
Fixed Rate [Member] | Less than three years [Member] | Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 3,859 |
Investment Owned, at Cost | 3,859 |
Weighted Average Coupon Rate, Percent | 6.01% |
Fixed Rate [Member] | Greater than three years and less than seven years [Member] | Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 243,429 |
Investment Owned, at Cost | 244,043 |
Weighted Average Coupon Rate, Percent | 3.32% |
Fixed Rate [Member] | Greater than seven years and less than eleven years [Member] | Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 1,160,705 |
Investment Owned, at Cost | 1,177,237 |
Weighted Average Coupon Rate, Percent | 3.64% |
Fixed Rate [Member] | Greater than eleven years [Member] | Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 17,609 |
Investment Owned, at Cost | 17,758 |
Weighted Average Coupon Rate, Percent | 3.89% |
Interest-Only [Member] | Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 12,722 |
Investment Owned, at Cost | 11,355 |
Weighted Average Coupon Rate, Percent | 4.00% |
Interest-Only [Member] | Less than three years [Member] | Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 2,169 |
Investment Owned, at Cost | 1,601 |
Weighted Average Coupon Rate, Percent | 5.12% |
Interest-Only [Member] | Greater than three years and less than seven years [Member] | Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 8,209 |
Investment Owned, at Cost | 7,759 |
Weighted Average Coupon Rate, Percent | 3.77% |
Interest-Only [Member] | Greater than seven years and less than eleven years [Member] | Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 2,344 |
Investment Owned, at Cost | 1,995 |
Weighted Average Coupon Rate, Percent | 3.50% |
Interest-Only [Member] | Greater than eleven years [Member] | Agency RMBS [Member] |  |
Real Estate-Related Securities [Line Items] |  |
Real estate securities, at fair value | 0 |
Investment Owned, at Cost | $ 0 |
Weighted Average Coupon Rate, Percent | 0.00% |

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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475986&loc=d3e42546-110969 + Details
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- Definition Cost of the investment. + References No definition available. + Details
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