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Reserve for Claims and Claim Expenses (Liability for Catastrophe Claims) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | $ (164,126) | $ (162,447) | $ (143,798)
Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (1,110) | (870) | (6,137)
Property |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (104,876) | (93,786) | (87,258)
Property | Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | 0 | (1,501) | 0
Property | Large and Small Catastrophe Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (104,876) | (92,285) | (87,258)
Property | Large Catastrophe Event |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (33,926) | (34,280) | (58,009)
Property | Thailand Floods (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (15,131) | (18,823) | (11,754)
Property | Tohoku Earthquake and Tsunami (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (7,314) | (5,313) | (5,408)
Property | New Zealand Earthquake (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | 1,987 | 22,754 | (3,088)
Property | 2011 International Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (20,458) | (1,382) | (20,250)
Property | Storm Sandy (2012) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (10,849) | (12,503) | (24,232)
Property | April and May U.S. Tornadoes (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (4,213) | (10,190) | (14,272)
Property | New Zealand Earthquake (2010) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | 6,904 | 1,095 | 24,692
Property | Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (5,310) | (11,300) | (23,947)
Property | Small Catastrophe Event |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (70,950) | (58,005) | (29,249)
Property | U.S. PCS 13/14 Wind and Thunderstorm (2013) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (6,286) | (1,882) | (4,239)
Property | Tianjin Explosion (2015) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (5,686) | 0 | 0
Property | U.S. PCS 15 Wind and Thunderstorm (2013) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (5,648) | 418 | 2,400
Property | U.S. PCS 81 Wind and Thunderstorm (2015) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (5,098) | 0 | 0
Property | U.S. PCS 70 Wind and Thunderstorm (2012) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (3,772) | (1,220) | 13,362
Property | U.S. PCS 24 Wind and Thunderstorm (2013) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (229) | (809) | (6,712)
Property | European Floods (2013) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (40) | (2,466) | (8,496)
Property | Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (44,191) | (52,046) | (25,564)
Casualty and Specialty |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (58,140) | (67,791) | (50,403)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | (52,601) | (72,551) | (50,403)
Casualty and Specialty | Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Prior years | $ (5,539) | $ 4,760 | $ 0

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