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Investments (Schedule of Net Investment Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses $ 42,227 $ 37,353 $ 85,036 $ 79,135
Investment expenses (3,623) (2,812) (6,725) (5,646)
Net investment income 38,604 34,541 78,311 73,489
Fixed maturity investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 33,791 26,372 59,730 50,232
Short term investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 297 286 494 476
Equity investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 1,913 779 4,517 1,575
Other investments, Hedge funds and private equity investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 5,425 8,340 15,838 20,657
Other investments, Other        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 674 1,483 4,182 6,011
Cash and cash equivalents        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses $ 127 $ 93 $ 275 $ 184