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Investments (Schedule of Net Investment Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses $ 57,783 $ 42,227 $ 90,532 $ 85,036
Investment expenses (3,659) (3,623) (7,545) (6,725)
Net investment income 54,124 38,604 82,987 78,311
Fixed maturity investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 46,091 33,791 82,097 59,730
Short term investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 1,227 297 2,227 494
Equity investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 865 1,913 2,528 4,517
Private equity investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 4,356 5,425 (5,002) 15,838
Other        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses 5,035 674 8,344 4,182
Cash and cash equivalents        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Investment income before investment expenses $ 209 $ 127 $ 338 $ 275