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Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Derivative Asset, Total | $ 34,869 |  | $ 74,714 |
Derivative Liabilities, Total | 32,149 |  | 18,917 |
Derivative Assets [Member] | Other Assets [Member] |  |  |  |
Interest rate futures | 246 |  | 2,459 |
Foreign currency forward contracts |  |  | 6,341 | [1]
Foreign currency forward contracts | 9,820 | [2] |  |
Foreign currency forward contracts | 948 | [3] |  |
Platinum warrant |  |  | 44,925 |
Credit default swaps |  |  | 3,064 |
Energy and weather contracts | 23,855 | [4] | 17,925 | [4]
Derivative Liabilities [Member] | Other Liabilities [Member] |  |  |  |
Interest rate futures | 1,019 |  | 719 |
Foreign currency forward contracts | 9,281 | [1] |  |
Foreign currency forward contracts |  |  | 3,141 | [2]
Foreign currency forward contracts |  |  | 44 | [3]
Credit default swaps | 537 |  |  |
Energy and weather contracts | $ 21,312 | [4] | $ 15,013 | [4]
[1] | Contracts used to manage foreign currency risks in underwriting 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.
[4] | Included in other assets is $28.0 million of derivative assets and $4.2 million of derivative liabilities at September 30, 2011 (December 31, 2010 - $21.7 million and $3.7 million, respectively). Included in other liabilities is $10.8 million of derivative assets and $32.1 million of derivative liabilities at September 30, 2011 (December 31, 2010 - $9.9 million and $24.9 million, respectively).

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