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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
--- | --- | ---
Jul. 18, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of the period |  | $ 310,544 | $ 369,338
Total unrealized gains (losses) |  |  |
Included in net investment income |  | (13,351) | 15,224
Included in other income (loss) |  | (426) |
Total realized gains (losses) |  |  |
Included in other income (loss) |  | 6,628 | 1,262
Total foreign exchange gains (losses) |  | (2,174) | (3,300)
Purchases |  | 105,442 | 33,990
Sales |  | (84,353) |
Settlements |  | (80,223) | (81,326)
Net transfers out of Level 3 |  |  | (24,644)
Balance at end of the period |  | 242,087 | 310,544
Fixed maturity investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of the period |  | 15,660 | 27,580
Total unrealized gains (losses) |  |  |
Included in net investment income |  | (542) | 12,724
Included in other income (loss) |  | 0 |
Total realized gains (losses) |  |  |
Included in other income (loss) |  | 0 | 0
Total foreign exchange gains (losses) |  | 0 | 0
Purchases |  | 0 | 0
Sales |  | 0 |
Settlements |  | (7,500) | 0
Net transfers out of Level 3 | $ (24,600) |  | (24,644)
Balance at end of the period |  | 7,618 | 15,660
Other investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of the period |  | 303,818 | 344,248
Total unrealized gains (losses) |  |  |
Included in net investment income |  | (12,992) | 1,045
Included in other income (loss) |  | 0 |
Total realized gains (losses) |  |  |
Included in other income (loss) |  | 0 | 0
Total foreign exchange gains (losses) |  | (2,181) | (3,279)
Purchases |  | 24,446 | 43,130
Sales |  | 0 |
Settlements |  | (72,723) | (81,326)
Net transfers out of Level 3 |  |  | 0
Balance at end of the period |  | 240,368 | 303,818
Other Assets and Liabilities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of the period |  | (8,934) | (2,490)
Total unrealized gains (losses) |  |  |
Included in net investment income |  | 183 | 1,455
Included in other income (loss) |  | (426) |
Total realized gains (losses) |  |  |
Included in other income (loss) |  | 6,628 | 1,262
Total foreign exchange gains (losses) |  | 7 | (21)
Purchases |  | 80,996 | (9,140)
Sales |  | (84,353) |
Settlements |  | 0 | 0
Net transfers out of Level 3 |  |  | 0
Balance at end of the period |  | (5,899) | (8,934)
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 |  | (13,351) | 2,434
Net investment income | Fixed maturity investments |  |  |
Total realized gains (losses) |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period |  | (359) | (66)
Net investment income | Other investments |  |  |
Total realized gains (losses) |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period |  | (12,992) | 1,045
Net investment income | Other Assets and Liabilities |  |  |
Total realized gains (losses) |  |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period |  | 0 | $ 1,455
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) |
Other income (loss) | Fixed maturity investments |  |  |
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 income (loss) | Other investments |  |  |
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 income (loss) | Other Assets and Liabilities |  |  |
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 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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