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Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2013
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Mar. 31, 2012
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Amount of gain (loss) recognized on derivatives | $ 20,703 | $ (27,684) | ||||||||
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Net investment income (loss) [Member] | Interest Rate Futures [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Amount of gain (loss) recognized on derivatives | 2 | 1,030 | ||||||||
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Net investment income (loss) [Member] | Credit Default Swap [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Amount of gain (loss) recognized on derivatives | 434 | 558 | ||||||||
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Net foreign exchange gains (losses) [Member] | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Amount of gain (loss) recognized on derivatives | 2,388 | [1] | 3,552 | [1] | ||||||
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Net foreign exchange gains (losses) [Member] | Foreign Currency Forward Contracts, Investment Operations [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Amount of gain (loss) recognized on derivatives | 1,678 | [2] | (4,248) | [2] | ||||||
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Net foreign exchange gains (losses) [Member] | Foreign Currency Forward Contracts, Energy And Risk Operations [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Amount of gain (loss) recognized on derivatives | 1,545 | [3] | 137 | [3] | ||||||
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Other income (loss) [Member] | Energy And Weather Contracts [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Amount of gain (loss) recognized on derivatives | $ 14,656 | $ (28,713) | ||||||||
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