v2.4.0.6

Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2013
Summary of Derivative Instruments [Abstract] |
Schedule of Location on Consolidated Balance Sheets and Fair Value Of Principal Derivative Instruments | The table below shows the gross and net amounts of recognized derivative assets and liabilities, including the location on the consolidated balance sheets and fair value of the Company’s principal derivative instruments:
|  | Derivative Assets |
| At March 31, 2013 | Gross Amounts of Recognized Assets |  | Gross Amounts Offset in the Balance Sheet |  | Net Amounts of Assets Presented in the Balance Sheet |  | Balance Sheet Location |  | Collateral |  | Net Amount |
| Interest rate futures | $ | 429 |  |  | — |  |  | $ | 429 |  |  | Other assets |  | $ | — |  |  | $ | 429 |  |
| Foreign currency forward contracts (1) | 8,070 |  |  | — |  |  | 8,070 |  |  | Other assets |  | — |  |  | 8,070 |  |
| Foreign currency forward contracts (2) | 6,541 |  |  | 5,880 |  |  | 661 |  |  | Other assets |  | — |  |  | 661 |  |
| Credit default swaps | 547 |  |  | 299 |  |  | 248 |  |  | Other assets |  | 248 |  |  | — |  |
| Energy and weather contracts | 70,165 |  |  | 25,894 |  |  | 44,271 |  |  | Other assets |  | — |  |  | 44,271 |  |
| Total | $ | 85,752 |  |  | $ | 32,073 |  |  | $ | 53,679 |  |  |  |  | $ | 248 |  |  | $ | 53,431 |  |
|  | Derivative Liabilities |
| At March 31, 2013 | Gross Amounts of Recognized Liabilities |  | Gross Amounts Offset in the Balance Sheet |  | Net Amounts of Liabilities Presented in the Balance Sheet |  | Balance Sheet Location |  | Collateral |  | Net Amount |
| Interest rate futures | $ | 30 |  |  | — |  |  | $ | 30 |  |  | Other liabilities |  | $ | 30 |  |  | $ | — |  |
| Foreign currency forward contracts (1) | 4,227 |  |  | — |  |  | 4,227 |  |  | Other liabilities |  | — |  |  | 4,227 |  |
| Foreign currency forward contracts (3) | 211 |  |  | 58 |  |  | 153 |  |  | Other liabilities |  | 153 |  |  | — |  |
| Energy and weather contracts | 45,694 |  |  | 20,088 |  |  | 25,606 |  |  | Other liabilities |  | 1,363 |  |  | 24,243 |  |
| Total | $ | 50,162 |  |  | $ | 20,146 |  |  | $ | 30,016 |  |  |  |  | $ | 1,546 |  |  | $ | 28,470 |  |
(1) | Contracts used to manage foreign currency risks in underwriting and non-investment operations.
(2) | Contracts used to manage foreign currency risks in investment operations.
(3) | Contracts used to manage foreign currency risks in energy and risk operations.
|  | Derivative Assets |
| At December 31, 2012 | Gross Amounts of Recognized Assets |  | Gross Amounts Offset in the Balance Sheet |  | Net Amounts of Assets Presented in the Balance Sheet |  | Balance Sheet Location |  | Collateral |  | Net Amount |
| Interest rate futures | $ | 441 |  |  | — |  |  | $ | 441 |  |  | Other assets |  | $ | — |  |  | $ | 441 |  |
| Foreign currency forward contracts (1) | 7,191 |  |  | — |  |  | 7,191 |  |  | Other assets |  | — |  |  | 7,191 |  |
| Foreign currency forward contracts (2) | 2,534 |  |  | 2,296 |  |  | 238 |  |  | Other assets |  | — |  |  | 238 |  |
| Credit default swaps | 784 |  |  | 333 |  |  | 451 |  |  | Other assets |  | 310 |  |  | 141 |  |
| Energy and weather contracts | 43,432 |  |  | 13,372 |  |  | 30,060 |  |  | Other assets |  | 3,286 |  |  | 26,774 |  |
| Total | $ | 54,382 |  |  | $ | 16,001 |  |  | $ | 38,381 |  |  |  |  | $ | 3,596 |  |  | $ | 34,785 |  |
|  | Derivative Liabilities |
| At December 31, 2012 | Gross Amounts of Recognized Liabilities |  | Gross Amounts Offset in the Balance Sheet |  | Net Amounts of Liabilities Presented in the Balance Sheet |  | Balance Sheet Location |  | Collateral |  | Net Amount |
| Interest rate futures | $ | 41 |  |  | — |  |  | $ | 41 |  |  | Other liabilities |  | $ | 41 |  |  | $ | — |  |
| Foreign currency forward contracts (1) | 4,173 |  |  | — |  |  | 4,173 |  |  | Other liabilities |  | — |  |  | 4,173 |  |
| Foreign currency forward contracts (3) | 579 |  |  | 53 |  |  | 526 |  |  | Other liabilities |  | — |  |  | 526 |  |
| Energy and weather contracts | 33,678 |  |  | 19,160 |  |  | 14,518 |  |  | Other liabilities |  | — |  |  | 14,518 |  |
| Total | $ | 38,471 |  |  | $ | 19,213 |  |  | $ | 19,258 |  |  |  |  | $ | 41 |  |  | $ | 19,217 |  |
(1) | Contracts used to manage foreign currency risks in underwriting and non-investment operations.
(2) | Contracts used to manage foreign currency risks in investment operations.
(3) | Contracts used to manage foreign currency risks in energy and risk operations.
Schedule of Gain (Loss) Recognized In Consolidated Statements Of Operations Related To Derivative Instruments | The location and amount of the gain (loss) recognized in the Company’s consolidated statements of operations related to its derivative instruments is shown in the following table:
|  | Location of gain (loss) recognized on derivatives |  | Amount of gain (loss) recognized on derivatives |
| Three months ended March 31, |  |  | 2013 |  | 2012 |
| Interest rate futures | Net investment income |  | $ | 2 |  |  | $ | 1,030 |  |
| Foreign currency forward contracts (1) | Net foreign exchange gains (losses) |  | 2,388 |  |  | 3,552 |  |
| Foreign currency forward contracts (2) | Net foreign exchange gains (losses) |  | 1,678 |  |  | (4,248 | ) |
| Foreign currency forward contracts (3) | Net foreign exchange gains (losses) |  | 1,545 |  |  | 137 |  |
| Credit default swaps | Net investment income |  | 434 |  |  | 558 |  |
| Energy and weather contracts | Other income (loss) |  | 14,656 |  |  | (28,713 | ) |
| Total |  |  | $ | 20,703 |  |  | $ | (27,684 | ) |
(1) | Contracts used to manage foreign currency risks in underwriting and non-investment operations.
(2) | Contracts used to manage foreign currency risks in investment operations.
(3) | Contracts used to manage foreign currency risks in energy and risk operations.
Schedule of Gross Derivative Contract Positions Outstanding Relating To Energy And Weather Derivatives Trading Activities | As of the dates set forth below, the Company had the following gross derivative contract positions outstanding relating to its energy and weather derivatives trading activities.
|  | Quantity (1) |  |  |
|  | March 31, 2013 |  | December 31, 2012 |  | Unit of measurement |
| Energy | 106,602,407 |  |  | 107,521,592 |  |  | One million British thermal units ("MMBTUs") |
| Temperature | 4,246,626 |  |  | 8,168,052 |  |  | $ per Degree Day Fahrenheit |
| Precipitation | 4,808,787 |  |  | 4,453,934 |  |  | $ per Inch |
(1) | Represents the sum of gross long and gross short derivative contracts.

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- Definition Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -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. + Details
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