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Investments (Schedule of Other Investments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Investments [Line Items]                      
Other investments $ 481,621       $ 504,147       $ 481,621 $ 504,147  
Net investment income 45,918 $ 28,338 $ 38,604 $ 39,707 25,886 $ 24,941 $ 34,541 $ 38,948 152,567 124,316 $ 208,028
Net unrealized gains (losses) recognized in earnings                 (13,549) (1,393) 75,789
Initial commitments 724,500               724,500    
Fulfilled commitments 528,800               528,800    
Unfunded commitments 204,500               204,500    
Other Investments                      
Schedule of Investments [Line Items]                      
Net investment income                 21,900 30,000 119,500
Other Investments | Net investment income                      
Schedule of Investments [Line Items]                      
Net unrealized gains (losses) recognized in earnings                 (13,500) (1,400) 75,800
Catastrophe bonds                      
Schedule of Investments [Line Items]                      
Other investments 241,253       200,329       241,253 200,329  
Private equity partnerships                      
Schedule of Investments [Line Items]                      
Other investments 214,848       281,932       214,848 281,932  
Senior secured bank loan fund                      
Schedule of Investments [Line Items]                      
Other investments 23,231       19,316       23,231 19,316  
Hedge funds                      
Schedule of Investments [Line Items]                      
Other investments $ 2,289       $ 2,570       2,289 2,570  
Change in estimate of fair value | Other Investments                      
Schedule of Investments [Line Items]                      
Net investment income                 $ (2,500) $ (600) $ (3,700)