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Investments (Schedule of Net Investment Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses $ 37,353 $ 28,999 $ 79,135 $ 75,141
Investment expenses (2,812) (2,836) (5,646) (5,776)
Net investment income 34,541 26,163 73,489 69,365
Fixed maturity investments
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 26,372 22,839 50,232 46,725
Short term investments
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 286 426 476 755
Equity investments
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 779 344 1,575 344
Other investments, Hedge funds and private equity investments
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 8,340 2,237 20,657 17,117
Other investments, Other
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 1,483 3,144 6,011 10,139
Cash and cash equivalents
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses $ 93 $ 9 $ 184 $ 61