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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 | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
Net Investment Income [Member]
Interest Rate Futures [Member]
|
Jun. 30, 2011
Net Investment Income [Member]
Interest Rate Futures [Member]
|
Jun. 30, 2012
Net Investment Income [Member]
Interest Rate Futures [Member]
|
Jun. 30, 2011
Net Investment Income [Member]
Interest Rate Futures [Member]
|
Jun. 30, 2012
Net Investment Income [Member]
Credit Default Swap [Member]
|
Jun. 30, 2011
Net Investment Income [Member]
Credit Default Swap [Member]
|
Jun. 30, 2012
Net Investment Income [Member]
Credit Default Swap [Member]
|
Jun. 30, 2011
Net Investment Income [Member]
Credit Default Swap [Member]
|
Jun. 30, 2012
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations [Member]
|
Jun. 30, 2011
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations [Member]
|
Jun. 30, 2012
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations [Member]
|
Jun. 30, 2011
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations [Member]
|
Jun. 30, 2012
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Investment Operations [Member]
|
Jun. 30, 2011
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Investment Operations [Member]
|
Jun. 30, 2012
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Investment Operations [Member]
|
Jun. 30, 2011
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Investment Operations [Member]
|
Jun. 30, 2012
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Energy And Risk Operations [Member]
|
Jun. 30, 2011
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Energy And Risk Operations [Member]
|
Jun. 30, 2012
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Energy And Risk Operations [Member]
|
Jun. 30, 2011
Net Foreign Exchange Gains (Losses) [Member]
Foreign Currency Forward Contracts, Energy And Risk Operations [Member]
|
Jun. 30, 2012
Other Income (Loss) [Member]
Energy And Weather Contracts [Member]
|
Jun. 30, 2011
Other Income (Loss) [Member]
Energy And Weather Contracts [Member]
|
Jun. 30, 2012
Other Income (Loss) [Member]
Energy And Weather Contracts [Member]
|
Jun. 30, 2011
Other Income (Loss) [Member]
Energy And Weather Contracts [Member]
|
Jan. 20, 2011
Other Income (Loss) [Member]
Platinum Warrant [Member]
|
Jun. 30, 2012
Other Income (Loss) [Member]
Platinum Warrant [Member]
|
Jun. 30, 2011
Other Income (Loss) [Member]
Platinum Warrant [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Amount of gain (loss) recognized on derivatives | $ 9,208 | $ (4,600) | $ (18,476) | $ 906 | $ (2,847) | $ (7,693) | $ (1,817) | $ (8,347) | $ (24) | $ 420 | $ 534 | $ 1,142 | $ (2,183) | [1] | $ 9,208 | [1] | $ 1,369 | [1] | $ 17,007 | [1] | $ 1,899 | [2] | $ (7,752) | [2] | $ (2,349) | [2] | $ (21,152) | [2] | $ 376 | [3] | $ (212) | [3] | $ 513 | [3] | $ (648) | [3] | $ 11,987 | $ 1,429 | $ (16,726) | $ 9,929 | $ 3,000 | $ 0 | $ 2,975 | ||||||
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