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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
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | $ (6,596) |  | $ 6,899 |  | $ (14,795) |  | $ 11,401 |
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 | (1,990) | [1] | (13,264) | [1] | 2,109 | [1] | (10,876) | [1]
Net foreign exchange gains (losses) | Foreign Currency Forward Contracts, Investment Operations |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | 58 | [2] | (332) | [2] | (1,341) | [2] | 1,346 | [2]
Net realized and unrealized gains (losses) on investments | Interest Rate Contracts |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | (7,362) |  | 20,203 |  | (19,636) |  | 20,205 |
Net realized and unrealized gains (losses) on investments | Credit Default Swaps |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | 299 |  | 292 |  | 458 |  | 726 |
Net realized and unrealized gains (losses) on investments | Weather Contract |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | 179 |  | 0 |  | 1,395 |  | 0 |
Other loss | Call Rights |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Amount of gain (loss) recognized on derivatives | $ 2,220 |  | $ 0 |  | $ 2,220 |  | $ 0 |
[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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