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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 381,396 | $ 420,010 | $ 369,338 | $ 430,372
Total unrealized gains (losses) |  |  |  |
Included in net investment income | (13,641) | 20,169 | 15,805 | 31,201
Included in other (loss) income | (1,956) | (625) | 264 | (625)
Total realized gains (losses) |  |  |  |
Included in other (loss) income | 225 | 281 | 225 | (2,365)
Total foreign exchange gains (losses) | (2,054) | 1,218 | (2,307) | 801
Purchases | 5,785 | 5,493 | 31,177 | 34,689
Settlements | (14,205) | (22,829) | (58,952) | (70,356)
Net transfers out of Level 3 | (24,644) |  | (24,644) |
Reclassified from other assets to other investments |  |  |  | 0
Balance at end of the period | 330,906 | 423,717 | 330,906 | 423,717
Net investment income |  |  |  |
Total realized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | (8,047) | 20,169 | 3,015 | 29,991
Other income (loss) |  |  |  |
Total realized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | (1,956) | (625) | 264 | (625)
Fixed maturity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 46,176 | 25,681 | 27,580 | 27,792
Total unrealized gains (losses) |  |  |  |
Included in net investment income | (5,596) | (311) | 13,000 | 78
Included in other (loss) income | 0 | 0 | 0 | 0
Total realized gains (losses) |  |  |  |
Included in other (loss) income | 0 | 0 | 0 | 0
Total foreign exchange gains (losses) | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | (2,500)
Net transfers out of Level 3 | (24,644) |  | (24,644) |
Reclassified from other assets to other investments |  |  |  | 0
Balance at end of the period | 15,936 | 25,370 | 15,936 | 25,370
Fixed maturity investments | Net investment income |  |  |  |
Total realized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | (2) | (311) | 210 | 78
Fixed maturity investments | Other income (loss) |  |  |  |
Total realized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 0 | 0 | 0 | 0
Other Investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 334,149 | 393,704 | 344,248 | 381,067
Total unrealized gains (losses) |  |  |  |
Included in net investment income | (8,054) | 20,480 | 1,401 | 31,123
Included in other (loss) income | 0 | 0 | 0 | 0
Total realized gains (losses) |  |  |  |
Included in other (loss) income | 0 | 0 | 0 | 0
Total foreign exchange gains (losses) | (2,074) | 1,218 | (2,273) | 801
Purchases | 12,425 | 6,056 | 37,817 | 35,252
Settlements | (14,205) | (22,829) | (58,952) | (67,856)
Net transfers out of Level 3 | 0 |  | 0 |
Reclassified from other assets to other investments |  |  |  | 18,242
Balance at end of the period | 322,241 | 398,629 | 322,241 | 398,629
Other Investments | Net investment income |  |  |  |
Total realized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | (8,054) | 20,480 | 1,401 | 29,913
Other Investments | Other income (loss) |  |  |  |
Total realized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 0 | 0 | 0 | 0
Other Assets and Liabilities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 1,071 | 625 | (2,490) | 21,513
Total unrealized gains (losses) |  |  |  |
Included in net investment income | 9 | 0 | 1,404 | 0
Included in other (loss) income | (1,956) | (625) | 264 | (625)
Total realized gains (losses) |  |  |  |
Included in other (loss) income | 225 | 281 | 225 | (2,365)
Total foreign exchange gains (losses) | 20 | 0 | (34) | 0
Purchases | (6,640) | (563) | (6,640) | (563)
Settlements | 0 | 0 | 0 | 0
Net transfers out of Level 3 | 0 |  | 0 |
Reclassified from other assets to other investments |  |  |  | (18,242)
Balance at end of the period | (7,271) | (282) | (7,271) | (282)
Other Assets and Liabilities | Net investment income |  |  |  |
Total realized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 9 | 0 | 1,404 | 0
Other Assets and Liabilities | Other income (loss) |  |  |  |
Total realized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | $ (1,956) | $ (625) | $ 264 | $ (625)

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Reclassified from Other Assets + References No definition available. + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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