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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 | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | $ 3,663 |  | $ 10,210 |  | $ (11,132) |  | $ 21,611 |
Net foreign exchange gains | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | (1,340) | [1] | 11,388 | [1] | 769 | [1] | 512 | [1]
Net foreign exchange gains | Foreign Currency Forward Contracts, Investment Operations |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | 8,827 | [2] | (5,016) | [2] | 7,486 | [2] | (3,670) | [2]
Net realized and unrealized (losses) gains on investments | Interest Rate Contracts |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | (1,805) |  | 3,291 |  | (21,441) |  | 23,496 |
Net realized and unrealized (losses) gains on investments | Credit Default Swaps |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | (72) |  | 266 |  | 386 |  | 992 |
Net realized and unrealized (losses) gains on investments | Weather Contract |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | 9 |  | 0 |  | 1,404 |  | 0 |
Other income (loss) | Call Rights |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | (1,956) |  | 0 |  | 264 |  | 0 |
Other income (loss) | Other |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | $ 0 |  | $ 281 |  | $ 0 |  | $ 281 |
[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.

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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