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Reserve for Claims and Claim Expenses (Liability for Catastrophe Claims) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Liability for Catastrophe Claims [Line Items]      
Prior years $ (162,447) $ (143,798) $ (143,954)
Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (71,191) (92,366) (111,496)
Attritional Claims and Claim Expenses      
Liability for Catastrophe Claims [Line Items]      
Prior years (91,256) (51,432) (32,458)
Reported Claims Less than Expected      
Liability for Catastrophe Claims [Line Items]      
Prior years (94,515) (51,432) (22,300)
Actuarial Assumption Changes      
Liability for Catastrophe Claims [Line Items]      
Prior years 3,259   (10,158)
Large Catastrophe Event | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (33,978) (65,537) (94,527)
Thailand Floods (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (18,823) (11,754)  
Tohoku Earthquake and Tsunami (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (5,314) (5,131) (19,033)
New Zealand Earthquake (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 22,754   (10,944)
2011 International Events | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (1,383)    
Storm Sandy (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (12,524) (24,232) (48,285)
April and May U.S. Tornadoes (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (10,189) (13,939)  
Deepwater Horizon (2010) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (8,116)    
Hurricanes Gustav and Ike (2008) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (4,673) (6,647) (16,665)
New Zealand Earthquake (2010) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 1,095 24,692 11,340
Subprime (2007) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 8,459 5,049  
LIBOR (2011 and 2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   (11,750)  
Hurricane Irene (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   (4,506)  
Windstorm Kyrill (2007) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   (3,615) (8,244)
Hurricane Isaac (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     2,610
Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (6,647) (13,704) (5,306)
Small Catastrophe Event | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (37,213) (26,829) (16,969)
2014 U.S. Winter Storms and Wind and Thunderstorm Events | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (28,042)    
U.S. PCS 24 Wind and Thunderstorm (2013) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   (6,712)  
European Floods (2013) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (2,272) (7,552)  
U.S. PCS 73 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   3,737  
U.S. PCS 83 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     (3,500)
U.S. PCS 70 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   9,625 8,225
U.S. PCS 76 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     (300)
Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (6,899) (25,927) (21,394)
Catastrophe Reinsurance      
Liability for Catastrophe Claims [Line Items]      
Prior years (70,377) (65,511) (102,037)
Catastrophe Reinsurance | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (70,377) (65,511) (102,037)
Catastrophe Reinsurance | Attritional Claims and Claim Expenses      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Catastrophe Reinsurance | Reported Claims Less than Expected      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Catastrophe Reinsurance | Actuarial Assumption Changes      
Liability for Catastrophe Claims [Line Items]      
Prior years 0   0
Catastrophe Reinsurance | Large Catastrophe Event | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (31,598) (47,506) (85,068)
Catastrophe Reinsurance | Thailand Floods (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (18,823) (9,254)  
Catastrophe Reinsurance | Tohoku Earthquake and Tsunami (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (5,314) (3,489) (18,033)
Catastrophe Reinsurance | New Zealand Earthquake (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 22,754   (10,944)
Catastrophe Reinsurance | 2011 International Events | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (1,383)    
Catastrophe Reinsurance | Storm Sandy (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (10,436) (20,104) (44,460)
Catastrophe Reinsurance | April and May U.S. Tornadoes (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (10,189) (13,939)  
Catastrophe Reinsurance | Deepwater Horizon (2010) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0    
Catastrophe Reinsurance | Hurricanes Gustav and Ike (2008) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (4,673) (6,647) (16,261)
Catastrophe Reinsurance | New Zealand Earthquake (2010) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 769 24,692 11,040
Catastrophe Reinsurance | Subprime (2007) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Catastrophe Reinsurance | LIBOR (2011 and 2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Catastrophe Reinsurance | Hurricane Irene (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   (4,506)  
Catastrophe Reinsurance | Windstorm Kyrill (2007) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   (3,615) (8,244)
Catastrophe Reinsurance | Hurricane Isaac (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     2,610
Catastrophe Reinsurance | Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (5,686) (10,644) (776)
Catastrophe Reinsurance | Small Catastrophe Event | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (38,779) (18,005) (16,969)
Catastrophe Reinsurance | 2014 U.S. Winter Storms and Wind and Thunderstorm Events | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (28,042)    
Catastrophe Reinsurance | U.S. PCS 24 Wind and Thunderstorm (2013) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   (6,712)  
Catastrophe Reinsurance | European Floods (2013) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (2,272) (7,552)  
Catastrophe Reinsurance | U.S. PCS 73 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   3,737  
Catastrophe Reinsurance | U.S. PCS 83 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     (3,500)
Catastrophe Reinsurance | U.S. PCS 70 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   9,625 8,225
Catastrophe Reinsurance | U.S. PCS 76 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     (300)
Catastrophe Reinsurance | Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (8,465) (17,103) (21,394)
Specialty Reinsurance      
Liability for Catastrophe Claims [Line Items]      
Prior years (91,912) (55,909) (34,111)
Specialty Reinsurance | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (1,762) (11,419) (2,463)
Specialty Reinsurance | Attritional Claims and Claim Expenses      
Liability for Catastrophe Claims [Line Items]      
Prior years (90,150) (44,490) (31,648)
Specialty Reinsurance | Reported Claims Less than Expected      
Liability for Catastrophe Claims [Line Items]      
Prior years (94,944) (44,490) (21,216)
Specialty Reinsurance | Actuarial Assumption Changes      
Liability for Catastrophe Claims [Line Items]      
Prior years 4,794   (10,432)
Specialty Reinsurance | Large Catastrophe Event | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (1,762) (11,419) (2,463)
Specialty Reinsurance | Thailand Floods (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 (2,500)  
Specialty Reinsurance | Tohoku Earthquake and Tsunami (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 (1,642) (1,000)
Specialty Reinsurance | New Zealand Earthquake (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0   0
Specialty Reinsurance | 2011 International Events | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0    
Specialty Reinsurance | Storm Sandy (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (2,088) 0 0
Specialty Reinsurance | April and May U.S. Tornadoes (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Specialty Reinsurance | Deepwater Horizon (2010) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (8,116)    
Specialty Reinsurance | Hurricanes Gustav and Ike (2008) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Specialty Reinsurance | New Zealand Earthquake (2010) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 326 0 300
Specialty Reinsurance | Subprime (2007) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 8,459 5,049  
Specialty Reinsurance | LIBOR (2011 and 2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   (10,500)  
Specialty Reinsurance | Hurricane Irene (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Specialty Reinsurance | Windstorm Kyrill (2007) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0 0
Specialty Reinsurance | Hurricane Isaac (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     0
Specialty Reinsurance | Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (343) (1,826) (1,763)
Specialty Reinsurance | Small Catastrophe Event | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Specialty Reinsurance | 2014 U.S. Winter Storms and Wind and Thunderstorm Events | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0    
Specialty Reinsurance | U.S. PCS 24 Wind and Thunderstorm (2013) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Specialty Reinsurance | European Floods (2013) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Specialty Reinsurance | U.S. PCS 73 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Specialty Reinsurance | U.S. PCS 83 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     0
Specialty Reinsurance | U.S. PCS 70 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0 0
Specialty Reinsurance | U.S. PCS 76 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     0
Specialty Reinsurance | Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Lloyd's      
Liability for Catastrophe Claims [Line Items]      
Prior years 340 (16,241) (8,256)
Lloyd's | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 1,566 (9,299) (5,267)
Lloyd's | Attritional Claims and Claim Expenses      
Liability for Catastrophe Claims [Line Items]      
Prior years (1,226) (6,942) (2,989)
Lloyd's | Reported Claims Less than Expected      
Liability for Catastrophe Claims [Line Items]      
Prior years 309 (6,942) (3,263)
Lloyd's | Actuarial Assumption Changes      
Liability for Catastrophe Claims [Line Items]      
Prior years (1,535)   274
Lloyd's | Large Catastrophe Event | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 (6,612) (5,267)
Lloyd's | Thailand Floods (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Lloyd's | Tohoku Earthquake and Tsunami (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Lloyd's | New Zealand Earthquake (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0   0
Lloyd's | 2011 International Events | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0    
Lloyd's | Storm Sandy (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 (4,128) (3,825)
Lloyd's | April and May U.S. Tornadoes (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Lloyd's | Deepwater Horizon (2010) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0    
Lloyd's | Hurricanes Gustav and Ike (2008) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Lloyd's | New Zealand Earthquake (2010) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Lloyd's | Subprime (2007) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Lloyd's | LIBOR (2011 and 2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   (1,250)  
Lloyd's | Hurricane Irene (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Lloyd's | Windstorm Kyrill (2007) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0 0
Lloyd's | Hurricane Isaac (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     0
Lloyd's | Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 (1,234) (1,442)
Lloyd's | Small Catastrophe Event | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 1,566 (2,687) 0
Lloyd's | 2014 U.S. Winter Storms and Wind and Thunderstorm Events | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0    
Lloyd's | U.S. PCS 24 Wind and Thunderstorm (2013) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Lloyd's | European Floods (2013) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Lloyd's | U.S. PCS 73 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Lloyd's | U.S. PCS 83 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     0
Lloyd's | U.S. PCS 70 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0 0
Lloyd's | U.S. PCS 76 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     0
Lloyd's | Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 1,566 (2,687) 0
Other      
Liability for Catastrophe Claims [Line Items]      
Prior years (498) (6,137) 450
Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (618) (6,137) (1,729)
Other | Attritional Claims and Claim Expenses      
Liability for Catastrophe Claims [Line Items]      
Prior years 120 0 2,179
Other | Reported Claims Less than Expected      
Liability for Catastrophe Claims [Line Items]      
Prior years 120 0 2,179
Other | Actuarial Assumption Changes      
Liability for Catastrophe Claims [Line Items]      
Prior years 0   0
Other | Large Catastrophe Event | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (618) 0 (1,729)
Other | Thailand Floods (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Other | Tohoku Earthquake and Tsunami (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Other | New Zealand Earthquake (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0   0
Other | 2011 International Events | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0    
Other | Storm Sandy (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Other | April and May U.S. Tornadoes (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Other | Deepwater Horizon (2010) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0    
Other | Hurricanes Gustav and Ike (2008) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 (404)
Other | New Zealand Earthquake (2010) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0 0
Other | Subprime (2007) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Other | LIBOR (2011 and 2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Other | Hurricane Irene (2011) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Other | Windstorm Kyrill (2007) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0 0
Other | Hurricane Isaac (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     0
Other | Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years (618) 0 (1,325)
Other | Small Catastrophe Event | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 (6,137) 0
Other | 2014 U.S. Winter Storms and Wind and Thunderstorm Events | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0    
Other | U.S. PCS 24 Wind and Thunderstorm (2013) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Other | European Floods (2013) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years 0 0  
Other | U.S. PCS 73 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0  
Other | U.S. PCS 83 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     0
Other | U.S. PCS 70 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years   0 0
Other | U.S. PCS 76 Wind and Thunderstorm (2012) | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years     0
Other | Other | Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Prior years $ 0 $ (6,137) $ 0