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Mortgage Backed Securities Mortgage backed securities (Tables) | 12 Months Ended
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Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities [Table Text Block] | The following table presents the components and weighted average coupon ("WAC") for the portion of the Company’s MBS designated as AFS as of December 31, 2013 and December 31, 2012:
| December 31, 2013
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | WAC
Agency: |  |  |  |  |  |  |  |  |  |  |  |  |
RMBS | $ | 2,591,568 |  |  | $ | 154,220 |  |  | $ | 2,745,788 |  |  | $ | 6,104 |  |  | $ | (59,742 | ) |  | $ | 2,692,150 |  |  | 3.22 | %
CMBS | 273,830 |  |  | 19,061 |  |  | 292,891 |  |  | 10,793 |  |  | (900 | ) |  | 302,784 |  |  | 5.07 | %
CMBS IO (1) | — |  |  | 453,766 |  |  | 453,766 |  |  | 9,895 |  |  | (3,334 | ) |  | 460,327 |  |  | 0.83 | %
Total Agency AFS: | 2,865,398 |  |  | 627,047 |  |  | 3,492,445 |  |  | 26,792 |  |  | (63,976 | ) |  | 3,455,261 |  |  |
Non-Agency: |  |  |  |  |  |  |  |  |  |  |  |  |
RMBS | 13,845 |  |  | (338 | ) |  | 13,507 |  |  | 338 |  |  | (80 | ) |  | 13,765 |  |  | 4.61 | %
CMBS | 375,703 |  |  | (18,277 | ) |  | 357,426 |  |  | 15,366 |  |  | (3,511 | ) |  | 369,281 |  |  | 5.10 | %
CMBS IO (1) | — |  |  | 150,518 |  |  | 150,518 |  |  | 2,618 |  |  | (1,999 | ) |  | 151,137 |  |  | 0.66 | %
Total non-Agency AFS: | 389,548 |  |  | 131,903 |  |  | 521,451 |  |  | 18,322 |  |  | (5,590 | ) |  | 534,183 |  |  |
Total AFS securities | $ | 3,254,946 |  |  | $ | 758,950 |  |  | $ | 4,013,896 |  |  | $ | 45,114 |  |  | $ | (69,566 | ) |  | $ | 3,989,444 |  |  |
(1) | The notional balance for Agency CMBS IO and non-Agency CMBS IO is $10,160,502 and $4,274,957, respectively, as of December 31, 2013.
| December 31, 2012
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | WAC
Agency: |  |  |  |  |  |  |  |  |  |  |  |  |
RMBS | $ | 2,425,826 |  |  | $ | 137,168 |  |  | $ | 2,562,994 |  |  | $ | 19,477 |  |  | $ | (11,134 | ) |  | $ | 2,571,337 |  |  | 3.67 | %
CMBS | 280,602 |  |  | 21,907 |  |  | 302,509 |  |  | 21,570 |  |  | (6 | ) |  | 324,073 |  |  | 5.19 | %
CMBS IO (1) | — |  |  | 550,171 |  |  | 550,171 |  |  | 18,218 |  |  | (1,209 | ) |  | 567,180 |  |  | 0.95 | %
Total Agency AFS: | 2,706,428 |  |  | 709,246 |  |  | 3,415,674 |  |  | 59,265 |  |  | (12,349 | ) |  | 3,462,590 |  |  |
Non-Agency: |  |  |  |  |  |  |  |  |  |  |  |  |
RMBS | 11,411 |  |  | (781 | ) |  | 10,630 |  |  | 606 |  |  | (198 | ) |  | 11,038 |  |  | 4.28 | %
CMBS | 463,747 |  |  | (17,313 | ) |  | 446,434 |  |  | 39,944 |  |  | (36 | ) |  | 486,342 |  |  | 5.31 | %
CMBS IO (1) | — |  |  | 108,928 |  |  | 108,928 |  |  | 5,054 |  |  | (40 | ) |  | 113,942 |  |  | 0.86 | %
Total non-Agency AFS: | 475,158 |  |  | 90,834 |  |  | 565,992 |  |  | 45,604 |  |  | (274 | ) |  | 611,322 |  |  |
Total AFS securities | $ | 3,181,586 |  |  | $ | 800,080 |  |  | $ | 3,981,666 |  |  | $ | 104,869 |  |  | $ | (12,623 | ) |  | $ | 4,073,912 |  |  |
(1) | The notional balance for the Agency CMBS IO and non-Agency CMBS IO is $10,059,495 and $2,393,614, respectively, as of December 31, 2012.
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, 2013 and December 31, 2012:
| December 31, 2013 |  | December 31, 2012
| Fair Value |  | Gross Unrealized Losses |  | # of Securities |  | Fair Value |  | Gross Unrealized Losses |  | # of Securities
Continuous unrealized loss position for less than 12 months: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 1,912,937 |  |  | $ | (43,543 | ) |  | 150 |  | $ | 1,026,277 |  |  | $ | (6,552 | ) |  | 83
Non-Agency MBS | 162,558 |  |  | (5,435 | ) |  | 39 |  | 13,877 |  |  | (76 | ) |  | 3
Continuous unrealized loss position for 12 months or longer: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 670,402 |  |  | $ | (20,433 | ) |  | 67 |  | $ | 271,719 |  |  | $ | (5,797 | ) |  | 34
Non-Agency MBS | 6,310 |  |  | (155 | ) |  | 6 |  | 2,701 |  |  | (198 | ) |  | 8

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