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Fair Values of Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Cusip One [Member] Numbers | Dec. 31, 2012 Cusip Two [Member] Numbers | Dec. 31, 2012 Cusip Three [Member] Numbers | Dec. 31, 2012 Cusip Four [Member] Numbers | Dec. 31, 2012 Collateralized Debt Obligations [Member] | Dec. 31, 2011 Collateralized Debt Obligations [Member] | Dec. 31, 2012 Collateralized Debt Obligations [Member] Cusip One [Member] | Dec. 31, 2012 Collateralized Debt Obligations [Member] Cusip Two [Member] | Dec. 31, 2012 Collateralized Debt Obligations [Member] Cusip Three [Member] | Dec. 31, 2012 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 | $ 183,945 | $ 183,131 |  |  |  |  |  |  |  |  | $ 5,208 | $ 5,214 | $ 1,256,972 | $ 1,296,077 | $ 1,302,536 | $ 1,351,903
Fair value | 187,475 | 186,962 |  |  |  |  |  |  |  |  | 1,392 | 1,361 | 249,184 | 246,509 | 568,650 | 327,289
Unrealized gains/(losses) | (3,866) | (3,858) |  |  |  |  |  |  |  |  | (3,816) | (3,853) | (1,007,788) | (1,049,569) | (733,886) | (1,024,614)
Lowest credit rating assigned |  |  | Ca |  | C |  | Ba2 |  | C |  |  |  |  |  |  |
Number of performing banks |  |  | 48 |  | 27 |  | 53 |  | 44 |  |  |  |  |  |  |
Number of performing insurance companies |  |  | 13 |  | 7 |  | 10 |  |  |  |  |  |  |  |  |
Number of issuers in default |  |  | 17 |  | 9 |  | 2 |  | 2 |  |  |  |  |  |  |
Number of issuers in deferral |  |  | 15 |  | 6 |  | 11 |  | 10 |  |  |  |  |  |  |
Defaults & deferrals as a % of performing collateral |  |  | 51.28% |  | 36.26% |  | 21.05% |  | 39.86% |  |  |  |  |  |  |
Subordination: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As a % of performing collateral |  |  | (7.37%) |  | (19.48%) |  | 33.21% |  | (12.77%) |  |  |  |  |  |  |
As a % of performing collateral - adjusted for projected future defaults |  |  | (14.22%) |  | (27.93%) |  | 28.49% |  | (24.33%) |  |  |  |  |  |  |
Other-than-temporary impairment model assumptions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year 1 - issuer average |  |  | 2.00% |  | 2.20% |  | 2.20% |  | 3.10% |  |  |  |  |  |  |
Year 2 - issuer average |  |  | 2.00% |  | 2.20% |  | 2.20% |  | 3.10% |  |  |  |  |  |  |
Year 3 - issuer average |  |  | 2.00% |  | 2.20% |  | 2.20% |  | 3.10% |  |  |  |  |  |  |
> 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 | $ 265 | $ 41,100 |  | $ 132,000 |  | $ 36,600 |  | $ 61,950 |  |  |  |  |  |  |
[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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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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