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Reserve for Claims and Claim Expenses (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses $ 162,447 $ 143,798 $ 143,954
Claims and claim expenses recovered (96,734) (30,634) (13,852)
Reinsurance balances payable      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Aggregate deposit liabilities 32,300 39,000  
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 300 300 400
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 (100) (100)
Catastrophe      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 71,191 92,366 111,496
Catastrophe | Large Catastrophe Event      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 33,978 65,537 94,527
Catastrophe | Storm Sandy (2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 12,524 24,232 48,285
Catastrophe | April and May U.S. Tornadoes (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 10,189 13,939  
Catastrophe | Hurricanes Gustav and Ike (2008)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 4,673 6,647 16,665
Catastrophe | 2011 International Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 1,383    
Catastrophe | Deepwater Horizon (2010)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 8,116    
Catastrophe | Subprime (2007)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (8,459) (5,049)  
Catastrophe | Thailand Floods (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 18,823 11,754  
Catastrophe | New Zealand Earthquake (2010)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (1,095) (24,692) (11,340)
Catastrophe | LIBOR (2011 and 2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   11,750  
Catastrophe | Tohoku Earthquake and Tsunami (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 5,314 5,131 19,033
Catastrophe | New Zealand Earthquake (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (22,754)   10,944
Catastrophe | Small Catastrophe Event      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 37,213 26,829 16,969
Catastrophe | 2014 U.S. Winter Storms and Wind and Thunderstorm Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 28,042    
Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   6,712  
Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   (9,625) (8,225)
Attritional Claims and Claim Expenses      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 91,256 51,432 32,458
Actual Reported Claims Less than Expected Claims      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 94,515 51,432 22,300
Actuarial Assumption Changes      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (3,259)   10,158
Catastrophe Reinsurance      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 70,377 65,511 102,037
Catastrophe Reinsurance | Catastrophe      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 70,377 65,511 102,037
Catastrophe Reinsurance | Catastrophe | Large Catastrophe Event      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 31,598 47,506 85,068
Catastrophe Reinsurance | Catastrophe | Storm Sandy (2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 10,436 20,104 44,460
Catastrophe Reinsurance | Catastrophe | April and May U.S. Tornadoes (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 10,189 13,939  
Catastrophe Reinsurance | Catastrophe | Hurricanes Gustav and Ike (2008)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 4,673 6,647 16,261
Catastrophe Reinsurance | Catastrophe | 2011 International Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 1,383    
Catastrophe Reinsurance | Catastrophe | Deepwater Horizon (2010)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0    
Catastrophe Reinsurance | Catastrophe | Subprime (2007)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0  
Catastrophe Reinsurance | Catastrophe | Thailand Floods (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 18,823 9,254  
Catastrophe Reinsurance | Catastrophe | New Zealand Earthquake (2010)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (769) (24,692) (11,040)
Catastrophe Reinsurance | Catastrophe | LIBOR (2011 and 2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   0  
Catastrophe Reinsurance | Catastrophe | Tohoku Earthquake and Tsunami (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 5,314 3,489 18,033
Catastrophe Reinsurance | Catastrophe | New Zealand Earthquake (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (22,754)   10,944
Catastrophe Reinsurance | Catastrophe | Small Catastrophe Event      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 38,779 18,005 16,969
Catastrophe Reinsurance | Catastrophe | 2014 U.S. Winter Storms and Wind and Thunderstorm Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 28,042    
Catastrophe Reinsurance | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   6,712  
Catastrophe Reinsurance | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   (9,625) (8,225)
Catastrophe Reinsurance | Catastrophe | U.S. Wind and Thunderstorm Event, 2012      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   (13,362)  
Catastrophe Reinsurance | Catastrophe | Other Large and Small Catastrophe Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 17,037    
Catastrophe Reinsurance | Catastrophe Claims and Claim Expense Excluding Certain Specific Events [Member]      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses     34,214
Catastrophe Reinsurance | Attritional Claims and Claim Expenses      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 0
Catastrophe Reinsurance | Actual Reported Claims Less than Expected Claims      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 0
Catastrophe Reinsurance | Actuarial Assumption Changes      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0   0
Specialty Reinsurance      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 91,912 55,909 34,111
Specialty Reinsurance | Catastrophe      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 1,762 11,419 2,463
Specialty Reinsurance | Catastrophe | Large Catastrophe Event      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 1,762 11,419 2,463
Specialty Reinsurance | Catastrophe | Storm Sandy (2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 2,088 0 0
Specialty Reinsurance | Catastrophe | April and May U.S. Tornadoes (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0  
Specialty Reinsurance | Catastrophe | Hurricanes Gustav and Ike (2008)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 0
Specialty Reinsurance | Catastrophe | 2011 International Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0    
Specialty Reinsurance | Catastrophe | Deepwater Horizon (2010)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 8,116    
Specialty Reinsurance | Catastrophe | Subprime (2007)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (8,459) (5,049)  
Specialty Reinsurance | Catastrophe | Thailand Floods (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 2,500  
Specialty Reinsurance | Catastrophe | New Zealand Earthquake (2010)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (326) 0 (300)
Specialty Reinsurance | Catastrophe | LIBOR (2011 and 2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   10,500  
Specialty Reinsurance | Catastrophe | Tohoku Earthquake and Tsunami (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 1,642 1,000
Specialty Reinsurance | Catastrophe | New Zealand Earthquake (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0   0
Specialty Reinsurance | Catastrophe | Small Catastrophe Event      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 0
Specialty Reinsurance | Catastrophe | 2014 U.S. Winter Storms and Wind and Thunderstorm Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0    
Specialty Reinsurance | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   0  
Specialty Reinsurance | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   0 0
Specialty Reinsurance | Attritional Claims and Claim Expenses      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 90,150 44,490 31,648
Specialty Reinsurance | Actual Reported Claims Less than Expected Claims      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 94,944 44,490 21,216
Specialty Reinsurance | Actuarial Assumption Changes      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (4,794)   10,432
Specialty Reinsurance | Reported Claims Less than Expected Including Certain Catastrophe Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses     23,679
Lloyd's      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (340) 16,241 8,256
Lloyd's | Catastrophe      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (1,566) 9,299 5,267
Lloyd's | Catastrophe | Large Catastrophe Event      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 6,612 5,267
Lloyd's | Catastrophe | Storm Sandy (2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 4,128 3,825
Lloyd's | Catastrophe | April and May U.S. Tornadoes (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0  
Lloyd's | Catastrophe | Hurricanes Gustav and Ike (2008)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 0
Lloyd's | Catastrophe | 2011 International Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0    
Lloyd's | Catastrophe | Deepwater Horizon (2010)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0    
Lloyd's | Catastrophe | Subprime (2007)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0  
Lloyd's | Catastrophe | Thailand Floods (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0  
Lloyd's | Catastrophe | New Zealand Earthquake (2010)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 0
Lloyd's | Catastrophe | LIBOR (2011 and 2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   1,250  
Lloyd's | Catastrophe | Tohoku Earthquake and Tsunami (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 0
Lloyd's | Catastrophe | New Zealand Earthquake (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0   0
Lloyd's | Catastrophe | Small Catastrophe Event      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (1,566) 2,687 0
Lloyd's | Catastrophe | 2014 U.S. Winter Storms and Wind and Thunderstorm Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0    
Lloyd's | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   0  
Lloyd's | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   0 0
Lloyd's | Attritional Claims and Claim Expenses      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 1,226 6,942 2,989
Lloyd's | Actual Reported Claims Less than Expected Claims      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (309) 6,942 3,263
Lloyd's | Actuarial Assumption Changes      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 1,535   (274)
Other      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 498 6,137 (450)
Other | Catastrophe      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 618 6,137 1,729
Other | Catastrophe | Large Catastrophe Event      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 618 0 1,729
Other | Catastrophe | Storm Sandy (2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 0
Other | Catastrophe | April and May U.S. Tornadoes (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0  
Other | Catastrophe | Hurricanes Gustav and Ike (2008)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 404
Other | Catastrophe | 2011 International Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0    
Other | Catastrophe | Deepwater Horizon (2010)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0    
Other | Catastrophe | Subprime (2007)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0  
Other | Catastrophe | Thailand Floods (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0  
Other | Catastrophe | New Zealand Earthquake (2010)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 0
Other | Catastrophe | LIBOR (2011 and 2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   0  
Other | Catastrophe | Tohoku Earthquake and Tsunami (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 0 0
Other | Catastrophe | New Zealand Earthquake (2011)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0   0
Other | Catastrophe | Small Catastrophe Event      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0 6,137 0
Other | Catastrophe | 2014 U.S. Winter Storms and Wind and Thunderstorm Events      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses 0    
Other | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   0  
Other | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012)      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses   0 0
Other | Attritional Claims and Claim Expenses      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (120) 0 (2,179)
Other | Actual Reported Claims Less than Expected Claims      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses (120) $ 0 (2,179)
Other | Actuarial Assumption Changes      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Liability for unpaid claims and claim expenses $ 0   $ 0