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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 378,609 | $ 431,574 | $ 369,338 | $ 430,372
Total unrealized gains (losses) |  |  |  |
Included in net investment income | 10,796 | (2,259) | 29,446 | 11,032
Included in other income (loss) | 2,220 | (676) | 2,220 | (2,646)
Total foreign exchange gains (losses) | (226) | 364 | (253) | (417)
Purchases | 10,391 | 18,411 | 25,392 | 29,196
Sales |  | (424) |  |
Settlements | (20,394) | (27,828) | (44,747) | (47,527)
Reclassified from other assets to other investments |  |  |  | 0
Balance at end of the period | 381,396 | 420,010 | 381,396 | 420,010
Net investment income |  |  |  |
Total unrealized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 10,796 | (2,259) | 29,446 | 11,032
Other loss |  |  |  |
Total unrealized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 2,220 |  | 2,220 |
Fixed maturity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 37,138 | 28,067 | 27,580 | 27,792
Total unrealized gains (losses) |  |  |  |
Included in net investment income | 9,038 | 114 | 18,596 | 389
Included in other income (loss) | 0 | 0 | 0 | 0
Total foreign exchange gains (losses) | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales |  | 0 |  |
Settlements | 0 | (2,500) | 0 | (2,500)
Reclassified from other assets to other investments |  |  |  | 0
Balance at end of the period | 46,176 | 25,681 | 46,176 | 25,681
Fixed maturity investments | Net investment income |  |  |  |
Total unrealized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 9,038 | 114 | 18,596 | 389
Fixed maturity investments | Other loss |  |  |  |
Total unrealized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 0 |  | 0 |
Other Investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 342,778 | 402,206 | 344,248 | 381,067
Total unrealized gains (losses) |  |  |  |
Included in net investment income | 1,579 | (2,373) | 9,455 | 10,643
Included in other income (loss) | 0 | 0 | 0 | 0
Total foreign exchange gains (losses) | (205) | 364 | (199) | (417)
Purchases | 10,391 | 18,411 | 25,392 | 29,196
Sales |  | (424) |  |
Settlements | (20,394) | (25,328) | (44,747) | (45,027)
Reclassified from other assets to other investments |  |  |  | 18,242
Balance at end of the period | 334,149 | 393,704 | 334,149 | 393,704
Other Investments | Net investment income |  |  |  |
Total unrealized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 1,579 | (2,373) | 9,455 | 10,643
Other Investments | Other loss |  |  |  |
Total unrealized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 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 | (1,307) | 1,301 | (2,490) | 21,513
Total unrealized gains (losses) |  |  |  |
Included in net investment income | 179 | 0 | 1,395 | 0
Included in other income (loss) | 2,220 | (676) | 2,220 | (2,646)
Total foreign exchange gains (losses) | (21) | 0 | (54) | 0
Purchases | 0 | 0 | 0 | 0
Sales |  | 0 |  |
Settlements | 0 | 0 | 0 | 0
Reclassified from other assets to other investments |  |  |  | (18,242)
Balance at end of the period | 1,071 | 625 | 1,071 | 625
Other Assets and Liabilities | Net investment income |  |  |  |
Total unrealized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 179 | 0 | 1,395 | 0
Other Assets and Liabilities | Other loss |  |  |  |
Total unrealized gains (losses) |  |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | $ 2,220 |  | $ 2,220 |

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- Definition This item represents the amount of the total foreign exchange gains or losses for the period which are included in the statement of income in net foreign exchange gains or losses. Such foreign exchange gains or losses relate to those assets or liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in investment income. The fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition This item represents the amount of the total realized gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. The fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 sale 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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