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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period |  | $ (2,680) |  | $ 1,719
Total realized and unrealized gains |  |  |  |
Purchases |  | (10,127) |  | (10,700)
Settlements |  |  |  | (7,500)
Balance at end of the period |  | (12,012) |  | (12,012)
Net investment income |  |  |  |
Total realized and unrealized gains |  |  |  |
Total realized and unrealized gains (losses) |  |  |  | (118)
Other income (loss) |  |  |  |
Total realized and unrealized gains |  |  |  |
Total realized and unrealized gains (losses) |  | 795 |  | 4,587
Other assets and (liabilities) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ (9,502) | (2,680) | $ (13,004) | (5,899)
Total realized and unrealized gains |  |  |  |
Purchases | (63) | (10,127) | 49 | (10,700)
Settlements | 5,937 |  | 5,937 | 0
Balance at end of the period | (3,493) | (12,012) | (3,493) | (12,012)
Other assets and (liabilities) | Net investment income |  |  |  |
Total realized and unrealized gains |  |  |  |
Total realized and unrealized gains (losses) |  |  |  | 0
Other assets and (liabilities) | Other income (loss) |  |  |  |
Total realized and unrealized gains |  |  |  |
Total realized and unrealized gains (losses) | $ 135 | 795 | $ 3,525 | 4,587
Fixed maturity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 0 |  | 7,618
Total realized and unrealized gains |  |  |  |
Purchases |  | 0 |  | 0
Settlements |  |  |  | (7,500)
Balance at end of the period |  | 0 |  | 0
Fixed maturity investments | Net investment income |  |  |  |
Total realized and unrealized gains |  |  |  |
Total realized and unrealized gains (losses) |  |  |  | (118)
Fixed maturity investments | Other income (loss) |  |  |  |
Total realized and unrealized gains |  |  |  |
Total realized and unrealized gains (losses) |  | $ 0 |  | $ 0

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- Definition This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or 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 (c)(1) -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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- 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=66048111&loc=d3e19207-110258 + Details
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