v2.4.0.6

Investments (Tables) | 3 Months Ended
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Mar. 31, 2013
Investments [Abstract] |
Schedule of Fair Value of Fixed Maturity Investments Trading | The following table summarizes the fair value of fixed maturity investments trading:
|  | March 31, 2013 |  | December 31, 2012 |
| U.S. treasuries | $ | 1,186,742 |  |  | $ | 1,259,800 |  |
| Agencies | 285,969 |  |  | 315,154 |  |
| Non-U.S. government (Sovereign debt) | 199,561 |  |  | 133,198 |  |
| Non-U.S. government-backed corporate | 291,077 |  |  | 349,514 |  |
| Corporate | 1,598,749 |  |  | 1,607,233 |  |
| Agency mortgage-backed | 433,661 |  |  | 399,619 |  |
| Non-agency mortgage-backed | 223,392 |  |  | 230,747 |  |
| Commercial mortgage-backed | 284,825 |  |  | 361,645 |  |
| Asset-backed | 7,909 |  |  | 8,511 |  |
| Total fixed maturity investments trading | $ | 4,511,885 |  |  | $ | 4,665,421 |  |
Schedule of Fair Value of Fixed Maturity Investments Available For Sale | The following table summarizes the amortized cost, fair value and related unrealized gains and losses and non-credit other-than-temporary impairments of fixed maturity investments available for sale:
|  |  |  | Included in Accumulated Other Comprehensive Income |  |  |  |  |
| At March 31, 2013 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Non-Credit Other-Than- Temporary Impairments (1) |
| Corporate | $ | 4,253 |  |  | $ | 626 |  |  | $ | (57 | ) |  | $ | 4,822 |  |  | $ | (62 | ) |
| Agency mortgage-backed | 6,378 |  |  | 500 |  |  | (1 | ) |  | 6,877 |  |  | — |  |
| Non-agency mortgage-backed | 13,889 |  |  | 2,946 |  |  | (10 | ) |  | 16,825 |  |  | (808 | ) |
| Commercial mortgage-backed | 10,730 |  |  | 1,546 |  |  | — |  |  | 12,276 |  |  | — |  |
| Asset-backed | 4,074 |  |  | 380 |  |  | — |  |  | 4,454 |  |  | — |  |
| Total fixed maturity investments available for sale | $ | 39,324 |  |  | $ | 5,998 |  |  | $ | (68 | ) |  | $ | 45,254 |  |  | $ | (870 | ) |
|  |  |  | Included in Accumulated Other Comprehensive Income |  |  |  |  |
| At December 31, 2012 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Non-Credit Other-Than- Temporary Impairments (1) |
| Corporate | $ | 7,065 |  |  | $ | 1,002 |  |  | $ | (93 | ) |  | $ | 7,974 |  |  | $ | (85 | ) |
| Agency mortgage-backed | 8,280 |  |  | 632 |  |  | — |  |  | 8,912 |  |  | — |  |
| Non-agency mortgage-backed | 14,613 |  |  | 2,989 |  |  | (10 | ) |  | 17,592 |  |  | (835 | ) |
| Commercial mortgage-backed | 37,292 |  |  | 7,229 |  |  | — |  |  | 44,521 |  |  | — |  |
| Asset-backed | 4,195 |  |  | 248 |  |  | — |  |  | 4,443 |  |  | — |  |
| Total fixed maturity investments available for sale | $ | 71,445 |  |  | $ | 12,100 |  |  | $ | (103 | ) |  | $ | 83,442 |  |  | $ | (920 | ) |
(1) | Represents the non-credit component of other-than-temporary impairments recognized in accumulated other comprehensive income since the adoption of guidance related to the recognition and presentation of other-than-temporary impairments under FASB ASC Topic Financial Instruments – Debt and Equity Securities, during the second quarter of 2009, adjusted for subsequent sales of securities. It does not include the change in fair value subsequent to the impairment measurement date.
Schedule of Contractual Maturities of Fixed Maturity Investments | Contractual maturities of fixed maturity investments are as follows. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Trading |  | Available for Sale |  | Total Fixed Maturity Investments |
| At March 31, 2013 | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |
| Due in less than one year | $ | 216,198 |  |  | $ | 215,538 |  |  | $ | — |  |  | $ | — |  |  | $ | 216,198 |  |  | $ | 215,538 |  |
| Due after one through five years | 2,613,378 |  |  | 2,636,410 |  |  | 2,312 |  |  | 2,648 |  |  | 2,615,690 |  |  | 2,639,058 |  |
| Due after five through ten years | 549,292 |  |  | 568,695 |  |  | 1,155 |  |  | 1,234 |  |  | 550,447 |  |  | 569,929 |  |
| Due after ten years | 129,104 |  |  | 141,455 |  |  | 786 |  |  | 940 |  |  | 129,890 |  |  | 142,395 |  |
| Mortgage-backed | 914,832 |  |  | 941,878 |  |  | 30,998 |  |  | 35,978 |  |  | 945,830 |  |  | 977,856 |  |
| Asset-backed | 7,481 |  |  | 7,909 |  |  | 4,073 |  |  | 4,454 |  |  | 11,554 |  |  | 12,363 |  |
| Total | $ | 4,430,285 |  |  | $ | 4,511,885 |  |  | $ | 39,324 |  |  | $ | 45,254 |  |  | $ | 4,469,609 |  |  | $ | 4,557,139 |  |
Schedule of Fair Value of Equity Investments Trading | The following table summarizes the fair value of equity investments trading:
|  | March 31, 2013 |  | December 31, 2012 |
| Financial institution securities | $ | 555 |  |  | $ | 58,186 |  |
Schedule of Net Investment Income (Loss) | The components of net investment income are as follows:
|  | Three months ended March 31, |
|  | 2013 |  | 2012 |
| Fixed maturity investments | $ | 24,310 |  |  | $ | 26,333 |  |
| Short term investments | 318 |  |  | 500 |  |
| Equity investments | — |  |  | 170 |  |
| Other investments |  |  |  |
| Hedge funds and private equity investments | 14,880 |  |  | 28,473 |  |
| Other | 6,995 |  |  | 14,170 |  |
| Cash and cash equivalents | 52 |  |  | 26 |  |
|  | 46,555 |  |  | 69,672 |  |
| Investment expenses | (2,940 | ) |  | (2,701 | ) |
| Net investment income | $ | 43,615 |  |  | $ | 66,971 |  |
Schedule of Net Realized and Unrealized Gains On Investments and Net Other-Than-Temporary Impairments | Net realized and unrealized gains on investments and net other-than-temporary impairments are as follows:
|  | Three months ended March 31, |
|  | 2013 |  | 2012 |
| Gross realized gains | $ | 34,080 |  |  | $ | 36,286 |  |
| Gross realized losses | (4,554 | ) |  | (6,950 | ) |
| Net realized gains on fixed maturity investments | 29,526 |  |  | 29,336 |  |
| Net unrealized (losses) gains on fixed maturity investments trading | (23,065 | ) |  | 14,257 |  |
| Net realized gains on equity investments trading | 17,561 |  |  | — |  |
| Net unrealized (losses) gains on equity investments trading | (10,172 | ) |  | 2,520 |  |
| Net realized and unrealized gains on investments | $ | 13,850 |  |  | $ | 46,113 |  |
| Total other-than-temporary impairments | $ | — |  |  | $ | (161 | ) |
| Portion recognized in other comprehensive income, before taxes | — |  |  | 27 |  |
| Net other-than-temporary impairments | $ | — |  |  | $ | (134 | ) |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | The following table provides an analysis of the components of other comprehensive income and reclassifications out of accumulated other comprehensive income.
|  | Three months ended March 31, 2013 |
|  | Investments in other ventures |  | Fixed maturity investments available for sale |  | Total |
| Beginning balance | $ | 1,625 |  |  | $ | 11,997 |  |  | $ | 13,622 |  |
| Other comprehensive loss before reclassifications | (1,505 | ) |  | (206 | ) |  | (1,711 | ) |
| Amounts reclassified from accumulated other comprehensive income by statement of operations line item: |  |  |  |  |  |
| Realized gains reclassified from accumulated other comprehensive income to net realized and unrealized gains on investments | — |  |  | (5,861 | ) |  | (5,861 | ) |
| Net current-period other comprehensive loss | (1,505 | ) |  | (6,067 | ) |  | (7,572 | ) |
| Ending balance | $ | 120 |  |  | $ | 5,930 |  |  | $ | 6,050 |  |
Schedule of Fixed Maturity Investments Available For Sale In Continual Unrealized Loss Position | The following table provides an analysis of the length of time the Company’s fixed maturity investments available for sale in an unrealized loss have been in a continual unrealized loss position.
|  | Less than 12 Months |  | 12 Months or Greater |  | Total |
| At March 31, 2013 | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |
| Corporate | $ | 387 |  |  | $ | (24 | ) |  | $ | 87 |  |  | $ | (33 | ) |  | $ | 474 |  |  | $ | (57 | ) |
| Agency mortgage-backed | 854 |  |  | (1 | ) |  | — |  |  | — |  |  | 854 |  |  | (1 | ) |
| Non-agency mortgage-backed | — |  |  | — |  |  | 101 |  |  | (10 | ) |  | 101 |  |  | (10 | ) |
| Total | $ | 1,241 |  |  | $ | (25 | ) |  | $ | 188 |  |  | $ | (43 | ) |  | $ | 1,429 |  |  | $ | (68 | ) |
|  | Less than 12 Months |  | 12 Months or Greater |  | Total |
| At December 31, 2012 | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |
| Corporate | $ | 598 |  |  | $ | (30 | ) |  | $ | 440 |  |  | $ | (63 | ) |  | $ | 1,038 |  |  | $ | (93 | ) |
| Non-agency mortgage-backed | — |  |  | — |  |  | 101 |  |  | (10 | ) |  | 101 |  |  | (10 | ) |
| Total | $ | 598 |  |  | $ | (30 | ) |  | $ | 541 |  |  | $ | (73 | ) |  | $ | 1,139 |  |  | $ | (103 | ) |
Rollforward of the Amount of Other-Than-Temporary Impairments Related To Credit Losses Recognized in Earnings For Which A Portion Of An Other-Than-Temporary Impairment Was Recognized In Accumulated Other Comprehensive Income | The following table provides a rollforward of the amount of other-than-temporary impairments related to credit losses recognized in earnings for which a portion of an other-than-temporary impairment was recognized in accumulated other comprehensive income:
|  | 2013 |  | 2012 |
| Balance – January 1 | $ | 838 |  |  | $ | 2,370 |  |
| Additions: |  |  |  |
| Amount related to credit loss for which an other-than-temporary impairment was not previously recognized | — |  |  | — |  |
| Amount related to credit loss for which an other-than-temporary impairment was previously recognized | — |  |  | 66 |  |
| Reductions: |  |  |  |
| Securities sold during the period | (27 | ) |  | (248 | ) |
| Securities for which the amount previously recognized in other comprehensive income was recognized in earnings, because the Company intends to sell the security or is more likely than not the Company will be required to sell the security | — |  |  | — |  |
| Increases in cash flows expected to be collected that are recognized over the remaining life of the security | — |  |  | — |  |
| Balance – March 31 | $ | 811 |  |  | $ | 2,188 |  |

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- Definition Tabular disclosure of trading securities (and certain trading assets) which consist of all investments in certain debt and equity securities (and other assets) that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1), b(1)-b(5) -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 -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph e -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2), b(1)-b(5) -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c),(e) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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