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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ 12,435 | $ (45,785) | $ (3,663) | $ (76,644) |
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 | $ (155) | $ (808) | $ (710) | (805) |
Property |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (16,968) | (37,512) |
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 |  |  | (17,811) | (37,512) |
Property | Large catastrophe events |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 2,764 | (8,015) |
Property | April and May U.S. Tornadoes (2011) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (4,163) | (3,396) |
Property | Tohoku Earthquake and Tsunami (2011) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 0 | (5,894) |
Property | New Zealand Earthquake (2010) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 5,001 | 8,710 |
Property | New Zealand Earthquake (2011) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 5,807 | 0 |
Property | Other |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (3,881) | (7,435) |
Property | Small catastrophe events |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (20,575) | (29,497) |
Property | Fort McMurray Wildfire (2016) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (6,386) | 0 |
Property | Tianjin Explosion (2015) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (4,896) | (6,163) |
Property | Other |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (9,293) | (23,334) |
Casualty and Specialty |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 14,015 | (38,327) |
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 |  |  | (17,004) | (32,209) |
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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