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Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) (USD $) In Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ (17,819) |  | $ (7,021) |  | $ (16,913) |  | $ 34,446 |
Interest Rate Contract [Member] | Investment Income [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (15,235) |  | 5,806 |  | (23,582) |  | 5,341 |
Energy And Weather Contracts [Member] | Other Income [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 2,272 |  | (11) |  | 12,201 |  | 7,174 |
Other Income [Member] | Credit Default Swap [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (4,290) |  | 310 |  | (3,148) |  | 223 |
Other Income [Member] | Platinum Warrant [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net |  |  | 14,352 |  | 2,975 |  | 8,987 |
Energy And Risk Operations Foreign Currency Contracts [Member] | Foreign Currency Loss [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 775 | [1] | (790) | [1] | 127 | [1] | 126 | [1]
Foreign Currency Loss [Member] | Underwriting Operations Related Foreign Currency Contracts [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | (15,927) | [2] | (1,160) | [2] | 1,080 | [2] | (686) | [2]
Foreign Currency Loss [Member] | Investment Operations Foreign Currency Contracts [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 14,586 | [3] | $ (25,528) | [3] | $ (6,566) | [3] | $ 13,281 | [3]
[1] | Contracts used to manage foreign currency risks in energy and risk operations.
[2] | Contracts used to manage foreign currency risks in underwriting operations.
[3] | Contracts used to manage foreign currency risks in investment operations.

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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + 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 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 4: 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. + Details
Name: | us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeNet
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration