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Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | $ (23,942) | $ 12,362 | $ (13,851)
Net realized and unrealized gains (losses) on investments | Interest Rate Futures |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives |  |  | (32,713)
Net realized and unrealized gains (losses) on investments | Interest Rate Futures | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | (17,379) | 5,573 |
Net realized and unrealized gains (losses) on investments | Credit Default Swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives |  |  | 328
Net realized and unrealized gains (losses) on investments | Credit Default Swaps | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 1,965 | (313) |
Net realized and unrealized gains (losses) on investments | Weather Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives |  |  | 1,454
Net realized and unrealized gains (losses) on investments | Weather Contract | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 0 | 183 |
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives |  |  | 4,457
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | (6,937) | (1,943) |
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Investment Operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives |  |  | $ 12,623
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Investment Operations | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | $ (1,591) | $ 8,862 |

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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=64837297&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=64837297&loc=SL5624171-113959 + Details
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