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Investments (Investment affiliate details) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Remaining commitment $ 222,806 $ 234,775    
Investments in investment affiliates, at cost 75,302 61,944    
Investments in affiliates 113,471 100,137    
Investment affiliate        
Schedule of Equity Method Investments [Line Items]        
Remaining commitment 107,386 125,996    
Investments in investment affiliates, at cost [1] 75,302 61,944    
Investments in affiliates 113,471 100,137 $ 94,697 $ 100,431
Investment affiliate | Aquiline Financial Services Fund II LP        
Schedule of Equity Method Investments [Line Items]        
Investments in investment affiliates, at cost $ 33,008 $ 33,349    
Voting ownership % 0.00% 0.00%    
Equity ownership % 8.10% 8.10%    
Investments in affiliates $ 49,208 $ 51,914    
Investment affiliate | Aquiline Financial Services Fund III LP        
Schedule of Equity Method Investments [Line Items]        
Investments in investment affiliates, at cost $ 24,737 $ 24,737    
Voting ownership % 0.00% 0.00%    
Equity ownership % 9.00% 9.00%    
Investments in affiliates $ 47,114 $ 44,733    
Investment affiliate | Aquiline Tech        
Schedule of Equity Method Investments [Line Items]        
Investments in investment affiliates, at cost $ 3,858 $ 3,858    
Voting ownership % 0.00% 0.00%    
Equity ownership % 10.60% 10.60%    
Investments in affiliates $ 3,450 $ 3,490    
Investment affiliate | Aquiline Armour        
Schedule of Equity Method Investments [Line Items]        
Investments in investment affiliates, at cost $ 13,699      
Voting ownership % 0.00%      
Equity ownership % 15.20%      
Investments in affiliates $ 13,699      
[1] The Company’s investments in investment affiliates have been treated as equity method investments with the corresponding gains and losses recorded in income as “Income from investment affiliates.”