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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 | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | $ 1,719 | $ 6,726
Total unrealized gains (losses) |  |
Included in net investment income | (118) | (359)
Included in other income (loss) |  | (426)
Total realized gains (losses) |  |
Included in other income (loss) | 6,339 | 6,628
Total foreign exchange gains |  | 7
Purchases | (13,444) | (80,996)
Sales |  | (84,353)
Settlements | (7,500) | (7,500)
Balance at end of the period | (13,004) | 1,719
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 |  | (359)
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 |  | (426)
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 gains (losses) |  |
Included in net investment income | (118) | (542)
Included in other income (loss) |  | 0
Total realized gains (losses) |  |
Included in other income (loss) | 0 | 0
Total foreign exchange gains |  | 0
Purchases | 0 | 0
Sales |  | 0
Settlements | (7,500) | (7,500)
Balance at end of the period | 0 | 7,618
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 |  | (359)
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
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) | (8,934)
Total unrealized gains (losses) |  |
Included in net investment income | 0 | 183
Included in other income (loss) |  | (426)
Total realized gains (losses) |  |
Included in other income (loss) | 6,339 | 6,628
Total foreign exchange gains |  | 7
Purchases | (13,444) | (80,996)
Sales |  | (84,353)
Settlements | 0 | 0
Balance at end of the period | $ (13,004) | (5,899)
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
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 |  | $ (426)

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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=66048111&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=66048111&loc=d3e19207-110258 + Details
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