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Reserve for Claims and Claim Expenses (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 02, 2015 | Dec. 31, 2013
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses | $ 2,568,730 | $ 2,632,519 | $ 1,345,816 |  | $ 1,462,705
Net claims and claim expenses incurred – prior accident years | (164,126) | (162,447) | (143,798) |  |
Claims and claim expenses recovered | (179,820) | (96,734) | (30,634) |  |
Reinsurance balances payable |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Aggregate deposit liabilities | 25,700 | 32,300 |  |  |
Aggregate deposit assets |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Aggregate deposit assets | 0 | 0 |  |  |
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 | 300 | 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 | 6,200 | (6,200) | (100) |  |
Property |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses | 584,036 |  |  |  |
Net claims and claim expenses incurred – prior accident years | (104,876) | (93,786) | (87,258) |  |
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 | 0 | (1,501) | 0 |  |
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 | (33,926) | (34,280) | (58,009) |  |
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 | (15,131) | (18,823) | (11,754) |  |
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 | (10,849) | (12,503) | (24,232) |  |
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) | (5,408) |  |
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 | 1,987 | 22,754 | (3,088) |  |
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 | (4,213) | (10,190) | (14,272) |  |
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 | 6,904 | 1,095 | 24,692 |  |
Property | Small 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 | (70,950) | (58,005) | (29,249) |  |
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 | (5,686) | 0 | 0 |  |
Property | European Floods (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 | (40) | (2,466) | (8,496) |  |
Property | U.S. PCS 24 Wind and Thunderstorm (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 | (229) | (809) | (6,712) |  |
Property | U.S. PCS 70 Wind and Thunderstorm (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 | (3,772) | (1,220) | 13,362 |  |
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 | (21,000) | (69,300) | (51,400) |  |
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 | (20,458) | (1,382) | (20,250) |  |
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 | 1,982,580 |  |  |  |
Net claims and claim expenses incurred – prior accident years | (58,140) | (67,791) | (50,403) |  |
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 | (52,601) | (72,551) | (50,403) |  |
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 | $ (5,539) | $ 4,760 | $ 0 |  |
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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