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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 381,569 | $ 378,609 | $ 310,544 | $ 369,338
Total unrealized (losses) gains |  |  |  |
Included in net investment income | (404) | 10,796 | 4,584 | 29,446
Included in other income (loss) | (348) | 2,220 | 348 | 2,220
Total realized gains (losses) |  |  |  |
Included in other income (loss) | 1,512 |  | 2,828 |
Total foreign exchange gains (losses) | 648 | (226) | (1,844) | (253)
Purchases | 6,681 | 10,391 | 92,840 | 25,392
Settlements | (30,616) | (20,394) | (49,562) | (44,747)
Balance at end of the period | 359,042 | 381,396 | 359,042 | 381,396
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 | (404) | 10,617 | 4,584 | 29,446
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 | (348) | 2,220 | (348) | 2,220
Fixed maturity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 15,474 | 37,138 | 15,660 | 27,580
Total unrealized (losses) gains |  |  |  |
Included in net investment income | (314) | 9,038 | (500) | 18,596
Included in other income (loss) | 0 | 0 | 0 | 0
Total realized gains (losses) |  |  |  |
Included in other income (loss) | 0 |  | 0 |
Total foreign exchange gains (losses) | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Settlements | (7,500) | 0 | (7,500) | 0
Balance at end of the period | 7,660 | 46,176 | 7,660 | 46,176
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 | (132) | 9,038 | (318) | 18,596
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 | 0 | 0 | 0
Other Investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 293,126 | 342,778 | 303,818 | 344,248
Total unrealized (losses) gains |  |  |  |
Included in net investment income | (106) | 1,579 | 4,908 | 9,455
Included in other income (loss) | 0 | 0 | 0 | 0
Total realized gains (losses) |  |  |  |
Included in other income (loss) | 0 |  | 0 |
Total foreign exchange gains (losses) | 654 | (205) | (1,844) | (199)
Purchases | 5,137 | 10,391 | 10,875 | 25,392
Settlements | (23,116) | (20,394) | (42,062) | (44,747)
Balance at end of the period | 275,695 | 334,149 | 275,695 | 334,149
Other 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 | (106) | 1,579 | 4,908 | 9,455
Other 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 | 0 | 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 | 72,969 | (1,307) | (8,934) | (2,490)
Total unrealized (losses) gains |  |  |  |
Included in net investment income | 16 | 179 | 176 | 1,395
Included in other income (loss) | (348) | 2,220 | 348 | 2,220
Total realized gains (losses) |  |  |  |
Included in other income (loss) | 1,512 |  | 2,828 |
Total foreign exchange gains (losses) | (6) | (21) | 0 | (54)
Purchases | 1,544 | 0 | 81,965 | 0
Settlements | 0 | 0 | 0 | 0
Balance at end of the period | 75,687 | 1,071 | 75,687 | 1,071
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 | 16 | 0 | 176 | 1,395
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 | $ (348) | $ 2,220 | $ (348) | $ 2,220

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