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Reserve for Claims and Claim Expenses (Liability for Catastrophe Claims) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | $ (40,996) | $ (164,126) | $ (162,447)
Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (1,583) | (1,110) | (870)
Property |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (45,596) | (104,876) | (93,786)
Property | Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 842 |  | (1,501)
Property | Large and Small Catastrophe Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (46,438) | (104,876) | (92,285)
Property | Large Catastrophe Event |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (7,640) | (33,926) | (34,280)
Property | Storm Sandy (2012) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (4,395) | (10,849) | (12,503)
Property | April and May U.S. Tornadoes (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (4,177) |  | (10,190)
Property | Thailand Floods (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (2,513) | (15,131) | (18,823)
Property | Hurricane Matthew (2016) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (1,239) |  |
Property | New Zealand Earthquake (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 5,807 | 1,987 | 22,754
Property | New Zealand Earthquake (2010) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 4,061 | 6,904 | 1,095
Property | Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (5,184) | (9,523) | (11,300)
Property | Tohoku Earthquake and Tsunami (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | (7,314) | (5,313)
Property | 2011 International Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (1,382)
Property | Small catastrophe events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (38,798) | (70,950) | (58,005)
Property | 2016 PCS Events (2016) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (18,550) |  |
Property | Tianjin Explosion (2015) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (8,002) | (5,686) |
Property | Fort McMurray Wildfire (2016) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (6,364) |  |
Property | Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (5,882) | (48,232) | (58,005)
Property | U.S. PCS 13/14 Wind and Thunderstorm (2013) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | (6,286) |
Property | U.S. PCS 15 Wind and Thunderstorm (2013) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | (5,648) |
Property | U.S. PCS 81 Wind and Thunderstorm (2015) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | (5,098) |
Casualty and Specialty |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 6,183 | (58,140) | (67,791)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (24,836) | (52,601) | (72,551)
Casualty and Specialty | Ogden Rate change |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 33,481 | 0 | 0
Casualty and Specialty | Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | $ (2,462) | $ (5,539) | $ 4,760
Ogden Rate [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Discount rate | (0.75%) | 2.50% |

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