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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 | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | $ 1,719 | $ 7,026
Total unrealized (losses) gains |  |
Included in net investment income | (118) | (26)
Total realized gains (losses) |  |
Included in other income | 1,700 | 1,316
Total foreign exchange gains (losses) |  | 6
Purchases | (525) | 80,421
Balance at end of the period | 2,776 | 88,743
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 | (118) | (26)
Fixed maturity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | 7,618 | 15,660
Total unrealized (losses) gains |  |
Included in net investment income | (118) | (186)
Total realized gains (losses) |  |
Included in other income | 0 | 0
Total foreign exchange gains (losses) |  | 0
Purchases | 0 | 0
Balance at end of the period | 7,500 | 15,474
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 | (118) | (186)
Other assets and (liabilities) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | (5,899) | (8,634)
Total unrealized (losses) gains |  |
Included in net investment income | 0 | 160
Total realized gains (losses) |  |
Included in other income | 1,700 | 1,316
Total foreign exchange gains (losses) |  | 6
Purchases | (525) | 80,421
Balance at end of the period | (4,724) | 73,269
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 | $ 0 | $ 160

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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 and liabilities 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 and liabilities 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=36462937&loc=d3e19207-110258 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value 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) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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