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Agency MBS (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Agency MBS [Line Items] |
Agency MBS Schedule [Table Text Block] | The following table presents the components of the Company’s investment in Agency MBS as of December 31, 2012 and December 31, 2011:
| December 31, 2012
| RMBS |  | CMBS |  | CMBS IO (1) |  | Total
Principal/par value | $ | 2,425,826 |  |  | $ | 306,527 |  |  | $ | — |  |  | $ | 2,732,353 |
Unamortized premium | 137,181 |  |  | 23,517 |  |  | 550,171 |  |  | 710,869 |
Unamortized discount | (13 | ) |  | — |  |  | — |  |  | (13 | )
Amortized cost | 2,562,994 |  |  | 330,044 |  |  | 550,171 |  |  | 3,443,209 |
Available for sale (recognized in statement of comprehensive income): |  |  |  |  |  |  |
Gross unrealized gains | 19,477 |  |  | 21,570 |  |  | 18,218 |  |  | 59,265 |
Gross unrealized losses | (11,134 | ) |  | (6 | ) |  | (1,209 | ) |  | (12,349 | )
Trading (recognized in income statement): |  |  |  |  |  |  |  |
Gross unrealized gains | — |  |  | 2,534 |  |  | — |  |  | 2,534 |
Total Agency MBS fair value: | $ | 2,571,337 |  |  | $ | 354,142 |  |  | $ | 567,180 |  |  | $ | 3,492,659 |
Weighted average coupon | 3.67 | % |  | 5.19 | % |  | 0.95 | % |  |
(1) | The combined notional balance for the Agency CMBS IO securities is $10,059,495 as of December 31, 2012.
| December 31, 2011
| RMBS |  | CMBS |  | CMBS IO (1) |  | Total
Principal/par value | $ | 1,488,397 |  |  | $ | 266,952 |  |  | $ | — |  |  | $ | 1,755,349 |
Unamortized premium | 85,488 |  |  | 21,627 |  |  | 86,358 |  |  | 193,473 |
Unamortized discount | (17 | ) |  | — |  |  | — |  |  | (17 | )
Amortized cost | 1,573,868 |  |  | 288,579 |  |  | 86,358 |  |  | 1,948,805 |
Available for sale (recognized in statement of comprehensive income): |  |  |  |  |  |  |
Gross unrealized gains | 10,787 |  |  | 11,746 |  |  | 350 |  |  | 22,883 |
Gross unrealized losses | (7,405 | ) |  | — |  |  | (1,043 | ) |  | (8,448 | )
Trading (recognized in income statement): |  |  |  |  |  |  |
Gross unrealized gains | — |  |  | 1,919 |  |  | — |  |  | 1,919 |
Total Agency MBS fair value: | $ | 1,577,250 |  |  | $ | 302,244 |  |  | $ | 85,665 |  |  | $ | 1,965,159 |
Weighted average coupon | 4.54 | % |  | 5.20 | % |  | 0.96 | % |  |
(1) | The combined notional balance for the Agency CMBS IO securities is $1,813,096 as of December 31, 2011.
Agency MBS [Member] |
Schedule of Agency MBS [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] | The following table presents certain information for those Agency MBS in an unrealized loss position as of December 31, 2012 and December 31, 2011:
| December 31, 2012 |  | December 31, 2011
| Fair Value |  | Unrealized Loss |  | # of Securities |  | Fair Value |  | Unrealized Loss |  | # of Securities
Unrealized loss position for: |  |  |  |  |  |  |  |  |  |  |
Less than one year | $ | 1,026,277 |  |  | $ | (6,552 | ) |  | 83 |  | $ | 680,101 |  |  | $ | (6,765 | ) |  | 54
One year or more | 271,719 |  |  | (5,797 | ) |  | 34 |  | 160,544 |  |  | (1,684 | ) |  | 27
| $ | 1,297,996 |  |  | $ | (12,349 | ) |  | 117 |  | $ | 840,645 |  |  | $ | (8,449 | ) |  | 81

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