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Reserve for Claims and Claim Expenses (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 02, 2015 | Dec. 31, 2014
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses | $ 3,493,778 | $ 2,568,730 | $ 2,632,519 |  | $ 1,345,816
Net claims and claim expenses incurred – prior accident years | (40,996) | (164,126) | (162,447) |  |
Claims and claim expenses recovered | (1,558,960) | (179,820) | (96,734) |  |
Reinsurance balances payable |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Aggregate deposit liabilities | 21,700 | 25,700 |  |  |
Aggregate deposit assets |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Aggregate deposit assets | 0 | 0 |  |  |
Other |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses | 673 |  |  |  |
Net claims and claim expenses incurred – prior accident years | (1,583) | (1,110) | (870) |  |
Deposit Contracts, Underwriting Risk Only |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Claims and claim expenses recovered | 200 | 200 | 300 |  |
Deposit Contracts, Timing Risk Only |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Increase (decrease) in other income related to assumed reinsurance contracts | 3,700 | 6,200 | 6,200 |  |
Property |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses | 1,343,290 |  |  |  |
Net claims and claim expenses incurred – prior accident years | (45,596) | (104,876) | (93,786) |  |
Property | Actuarial assumption changes |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | 842 |  | (1,501) |  |
Property | Large Catastrophe Event |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | (7,640) | (33,926) | (34,280) |  |
Property | Thailand Floods (2011) |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | (2,513) | (15,131) | (18,823) |  |
Property | Storm Sandy (2012) |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | (4,395) | (10,849) | (12,503) |  |
Property | Tohoku Earthquake and Tsunami (2011) |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  | (7,314) | (5,313) |  |
Property | New Zealand Earthquake (2010) |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | 4,061 | 6,904 | 1,095 |  |
Property | New Zealand Earthquake (2011) |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | 5,807 | 1,987 | 22,754 |  |
Property | April and May U.S. Tornadoes (2011) |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | (4,177) |  | (10,190) |  |
Property | Small catastrophe events |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | (38,798) | (70,950) | (58,005) |  |
Property | U.S. PCS Wind And Thunderstorms (2015 and 2013) |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  | (17,000) |  |  |
Property | Tianjin Explosion (2015) |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | (8,002) | (5,686) |  |  |
Property | Other Large and Small Catastrophe Events |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (69,300) |  |
Property | 2011 International Events |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (1,382) |  |
Casualty and Specialty |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses | 2,149,815 |  |  |  |
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 |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | (24,836) | (52,601) | (72,551) |  |
Casualty and Specialty | Actuarial assumption changes |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (2,462) | $ (5,539) | $ 4,760 |  |
Platinum Underwriters Holdings, Ltd. |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses |  |  |  | $ 1,400,000 |
Platinum Underwriters Holdings, Ltd. | Property |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses |  |  |  | 179,700 |
Platinum Underwriters Holdings, Ltd. | Casualty and Specialty |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses |  |  |  | $ 1,200,000 |

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