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Investments (Schedule of Net Investment Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses $ 27,849 $ 62,653 $ 106,984 $ 137,794
Investment expenses (2,908) (2,722) (8,554) (8,498)
Net investment income 24,941 59,931 98,430 129,296
Fixed maturity investments
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 24,519 24,423 74,751 71,148
Short term investments
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 251 563 727 1,318
Equity investments
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 736 706 2,311 1,050
Other investments, Hedge funds and private equity investments
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses (3,320) 14,179 17,337 31,296
Other investments, Other
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 5,547 22,735 11,558 32,874
Cash and cash equivalents
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses $ 116 $ 47 $ 300 $ 108