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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 | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | $ 6,335 | $ (13,610) | $ (30,671) | $ 1,192
Net realized and unrealized gains (losses) on investments | Interest Rate Futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 1,040 | (16,817) | (27,775) | (1,441)
Net realized and unrealized gains (losses) on investments | Credit Default Swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 687 | 195 | 902 | 257
Net realized and unrealized gains (losses) on investments | Weather Contract |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 0 | 10 | 0 | 180
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 | 5,097 | 817 | (92) | (5,782)
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Investment Operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | $ (489) | $ 2,185 | $ (3,706) | $ 7,978

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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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