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Reserve for Claims and Claim Expenses (Prior Year Development of the Reserve for Net Claims and Claim Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (45,104) | $ (29,255) | $ (16,098) | $ (30,859) |
Ogden Rate |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Discount rate |  |  | (0.75%) |  | 2.50%
Other |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (227) | $ 85 | $ (555) | 3 |
Property |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (24,800) | (18,989) |
Property | Actuarial assumption changes |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (843) | 0 |
Property | Large and Small Catastrophe Events |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (25,643) | (18,989) |
Property | Large catastrophe events |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 1,851 | 1,054 |
Property | New Zealand Earthquake (2011) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 5,807 | 0 |
Property | New Zealand Earthquake (2010) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 4,061 | 2,962 |
Property | April and May U.S. Tornadoes (2011) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (4,153) | (1,408) |
Property | Other |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (3,864) | (500) |
Property | Small catastrophe events |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (27,494) | (20,043) |
Property | Fort McMurray Wildfire (2016) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (5,848) | 0 |
Property | Tianjin Explosion (2015) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (4,896) | 0 |
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 |  |  | (3,906) | (6,260) |
Property | Other |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (12,844) | (13,783) |
Casualty and Specialty |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 9,257 | (11,873) |
Casualty and Specialty | Actuarial assumption changes |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (2,462) | (6,118) |
Casualty and Specialty | Actuarial methods - actual reported claims lower than expected claims |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (21,762) | (5,755) |
Casualty and Specialty | Ogden Rate change |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | $ 33,481 | $ 0 |

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