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Investments (Schedule of Net Investment Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses $ 31,917 $ 27,849 $ 116,953 $ 106,984
Investment expenses (3,579) (2,908) (10,304) (8,554)
Net investment income 28,338 24,941 106,649 98,430
Fixed maturity investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 37,023 24,519 96,753 74,751
Short term investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 267 251 761 727
Equity investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 1,791 736 6,308 2,311
Other investments, Hedge funds and private equity investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses (14,505) (3,320) 1,333 17,337
Other investments, Other        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 7,261 5,547 11,443 11,558
Cash and cash equivalents        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses $ 80 $ 116 $ 355 $ 300