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Investments (Schedule of Net Investment Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Investment income before investment expenses $ 41,782 $ 46,142
Investment expenses (2,834) (2,940)
Net investment income 38,948 43,202
Fixed maturity investments
    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Investment income before investment expenses 23,860 23,886
Short term investments
    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Investment income before investment expenses 190 329
Equity investments
    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Investment income before investment expenses 796 0
Other investments, Hedge funds and private equity investments
    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Investment income before investment expenses 12,317 14,880
Other investments, Other
    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Investment income before investment expenses 4,528 6,995
Cash and cash equivalents
    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Investment income before investment expenses $ 91 $ 52