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Investments - Amortized cost and fair value of trading securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading $ 1,480,434 $ 1,263,609
Fixed maturities, trading at fair value 1,608,882 1,235,699
Amortized cost of short-term investments, trading 24,179 60,176
Short-term investments, trading at fair value 24,169 60,330
Total investments trading 1,633,051 1,296,029
Life Funds Withheld Assets    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,480,434 1,263,609
Fixed maturities, trading at fair value 1,608,882 1,235,699
Amortized cost of short-term investments, trading 24,179 60,176
Short-term investments, trading at fair value 24,169 60,330
Trading securities, cost 1,504,613 1,323,785
Total investments trading 1,633,051 1,296,029
Life Funds Withheld Assets | U.S. Government and Government - Related/Supported    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 16,438 4,957
Fixed maturities, trading at fair value 16,866 4,990
Life Funds Withheld Assets | RMBS - Agency    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,674 370
Fixed maturities, trading at fair value 1,680 368
Life Funds Withheld Assets | RMBS - Non-Agency    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 148  
Fixed maturities, trading at fair value 151  
Life Funds Withheld Assets | Commercial mortgage-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 5,198 4,874
Fixed maturities, trading at fair value 5,614 4,803
Life Funds Withheld Assets | Other asset-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 25,744 26,405
Fixed maturities, trading at fair value 27,699 25,700
Life Funds Withheld Assets | Non-U.S. Sovereign Government, Provincial, Supranational, and Government-Related/Supported    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 356,365 373,492
Fixed maturities, trading at fair value 393,756 370,261
Financial Services Sector | Life Funds Withheld Assets | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 458,097 344,070
Fixed maturities, trading at fair value 487,472 335,956
Non-Financial Services Sector | Life Funds Withheld Assets | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 616,770 509,441
Fixed maturities, trading at fair value $ 675,644 $ 493,621