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Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | $ 6,222 | $ (23,942) | $ 12,362
Net realized and unrealized gains (losses) on investments | Interest rate futures |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | (3,252) | (17,379) | 5,573
Net realized and unrealized gains (losses) on investments | Interest rate swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 436 | 0 | 0
Net realized and unrealized gains (losses) on investments | Credit default swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 326 | 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 | 0 | 0 | 183
Net foreign exchange gains (losses) | Foreign currency forward contracts, underwriting and non-investment operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 9,628 | (6,937) | (1,943)
Net foreign exchange gains (losses) | Foreign currency forward contracts, investment operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | $ (916) | $ (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=84234895&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=84234895&loc=SL5624171-113959 + Details
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