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Real Estate Securities Schedule of Real Estate Securities (Details) (USD $) | 3 Months Ended |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2012 Non-Agency RMBS [Member] | Sep. 30, 2013 Non-Agency RMBS [Member] | Sep. 30, 2013 Residential Mortgage Backed Securities [Member] | Sep. 30, 2013 15-year fixed rate mortgages [Member] Agency RMBS [Member] | Sep. 30, 2013 30-year fixed rate mortgages [Member] Agency RMBS [Member] | Sep. 30, 2013 Adjustable Rate Residential Mortgage [Member] Agency RMBS [Member] | Sep. 30, 2013 Interest-Only [Member] Agency RMBS [Member] | Sep. 30, 2013 Agency Securities [Member] Agency RMBS [Member]
Real Estate-Related Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Holdings | $ 1,453,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Principal |  |  | 26,890,000 |  | 55,798,000 |  | 1,552,173,000 |  | 192,906,000 |  | 1,165,255,000 |  | 29,840,000 |  | 108,374,000 |  | 1,496,375,000 |
Unamortized Premium (Discount) |  |  | (13,400,000) |  | (21,975,000) |  | (64,098,000) |  | 7,325,000 |  | 45,873,000 |  | 1,698,000 |  | (97,019,000) |  | (42,123,000) |
Amortized Cost |  |  | 13,490,000 |  | 33,823,000 |  | 1,488,075,000 |  | 200,231,000 |  | 1,211,128,000 |  | 31,538,000 |  | 11,355,000 |  | 1,454,252,000 |
Gross Unrealized Gain |  |  | 117,000 |  | 1,305,000 |  | 11,201,000 |  | 794,000 |  | 7,443,000 |  | 169,000 |  | 1,490,000 |  | 9,896,000 |
Gross Unrealized Losses |  |  | (11,000) |  | (661,000) |  | (26,485,000) |  | (1,575,000) |  | (24,126,000) |  | 0 |  | (123,000) |  | (25,824,000) |
Fair Value | $ 1,472,791,000 | $ 13,596,000 | $ 13,596,000 |  | $ 34,467,000 |  | $ 1,472,791,000 |  | $ 199,450,000 |  | $ 1,194,445,000 |  | $ 31,707,000 |  | $ 12,722,000 |  | $ 1,438,324,000 |
Weighted Average Coupon |  |  | 2.20% |  | 2.88% |  | 3.60% |  | 3.05% |  | 3.66% |  | 4.47% |  | 4.00% |  | 3.62% |
Weighted Average Yield |  |  | 8.50% |  | 7.85% |  | 3.14% |  | 2.25% |  | 3.09% |  | 2.38% |  | 11.95% |  | 3.03% |
Weighted Average Life (Years) |  |  | 7 years 292 days | [1] | 5 years 161 days | [1] | 8 years 300 days | [1] | 5 years 314 days | [1] | 9 years 362 days | [1] | 3 years 358 days | [1] | 4 years 249 days | [1] | 8 years 347 days | [1]
[1] | Average lives of RMBS are generally shorter than stated contractual maturities. Average lives are affected by the contractual maturities of the underlying mortgages, scheduled periodic payments of principal, and unscheduled prepayments of principal.

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