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Fair Value (Details 1) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Cusip One [Member] Numbers | Mar. 31, 2013 Cusip Two [Member] Numbers | Mar. 31, 2013 Cusip Three [Member] Numbers | Mar. 31, 2013 Cusip Four [Member] Numbers | Mar. 31, 2013 Collateralized Debt Obligations [Member] | Dec. 31, 2012 Collateralized Debt Obligations [Member] | Mar. 31, 2013 Collateralized Debt Obligations [Member] Cusip One [Member] | Mar. 31, 2013 Collateralized Debt Obligations [Member] Cusip Two [Member] | Mar. 31, 2013 Collateralized Debt Obligations [Member] Cusip Three [Member] | Mar. 31, 2013 Collateralized Debt Obligations [Member] Cusip Four [Member]
Cusip |  |  | 74043CAC1 |  | 74042TAJ0 |  | 01449TAB9 |  | 01450NAC6 |  |  |  |  |  |  |
Deal name |  |  | PreTSL XXIV |  | PreTSL XXVII |  | Alesco IX |  | Alesco XVII |  |  |  |  |  |  |
Class |  |  | B-1 |  | C-1 |  | A-2A |  | B |  |  |  |  |  |  |
Book value | $ 187,903 | $ 183,945 |  |  |  |  |  |  |  |  | $ 5,208 | $ 5,208 | $ 1,257 | $ 1,296 | $ 1,303 | $ 1,352
Fair value | 190,462 | 187,475 |  |  |  |  |  |  |  |  | 1,587 | 1,392 | 320 | 288 | 615 | 364
Unrealized gains/(losses) | (3,814) | (3,866) |  |  |  |  |  |  |  |  | (3,621) | (3,816) | (937) | (1,008) | (688) | (988)
Lowest credit rating assigned |  |  | CC |  | C |  | BB |  | C |  |  |  |  |  |  |
Number of performing banks |  |  | 51 |  | 28 |  | 53 |  | 44 |  |  |  |  |  |  |
Number of performing insurance companies |  |  | 13 |  | 7 |  | 10 |  |  |  |  |  |  |  |  |
Number of issuers in default |  |  | 17 |  | 9 |  | 2 |  | 2 |  |  |  |  |  |  |
Number of issuers in deferral |  |  | 12 |  | 5 |  | 11 |  | 10 |  |  |  |  |  |  |
Defaults & deferrals as a % of performing collateral |  |  | 47.06% |  | 33.47% |  | 21.05% |  | 32.67% |  |  |  |  |  |  |
Subordination: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As a % of performing collateral |  |  | (2.61%) |  | (15.67%) |  | 33.57% |  | 10.55% |  |  |  |  |  |  |
As a % of performing collateral - adjusted for projected future defaults |  |  | (9.51%) |  | (24.24%) |  | 28.88% |  | 5.15% |  |  |  |  |  |  |
Other-than-temporary impairment model assumptions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year 1 - issuer average |  |  | 2.10% |  | 2.30% |  | 2.20% |  | 1.90% |  |  |  |  |  |  |
Year 2 - issuer average |  |  | 2.10% |  | 2.30% |  | 2.20% |  | 1.90% |  |  |  |  |  |  |
Year 3 - issuer average |  |  | 2.10% |  | 2.30% |  | 2.20% |  | 1.90% |  |  |  |  |  |  |
> 3 Years - issuer average |  |  |  | [1] |  | [1] |  | [1] |  | [1] |  |  |  |  |  |
Discount rate - 3 month Libor, plus implicit yield spread at purchase |  |  | 1.48% |  | 1.23% |  | 1.27% |  | 1.44% |  |  |  |  |  |  |
Recovery assumptions |  |  |  | [2] |  | [2] |  | [2] |  | [2] |  |  |  |  |  |
Prepayments |  |  | 0.00% |  | 0.00% |  | 0.00% |  | 0.00% |  |  |  |  |  |  |
Other-than-temporary impairment | $ 271 | $ 271 | $ 41 |  | $ 132 |  | $ 36 |  | $ 62 |  |  |  |  |  |  |
[1] | Default rates > 3 years are evaluated on a issuer by issuer basis and range from 0.25% to 5.00%.
[2] | Recovery assumptions are evaluated on a issuer by issuer basis and range from 0% to 15% with a five year lag.

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