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Investments - Amortized cost and fair value of trading securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading $ 1,385,588 $ 1,263,609
Fixed maturities, trading at fair value 1,478,407 1,235,699
Amortized cost of short-term investments, trading 18,495 60,176
Short-term investments, trading at fair value 18,499 60,330
Total investments trading 1,496,906 1,296,029
Life Funds Withheld Assets    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,385,588 1,263,609
Fixed maturities, trading at fair value 1,478,407 1,235,699
Amortized cost of short-term investments, trading 18,495 60,176
Short-term investments, trading at fair value 18,499 60,330
Trading securities, cost 1,404,083 1,323,785
Total investments trading 1,496,906 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 17,827 4,957
Fixed maturities, trading at fair value 18,570 4,990
Life Funds Withheld Assets | RMBS - Agency    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,844 370
Fixed maturities, trading at fair value 1,868 368
Life Funds Withheld Assets | RMBS - Non-Agency    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 190  
Fixed maturities, trading at fair value 197  
Life Funds Withheld Assets | Commercial mortgage-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 4,970 4,874
Fixed maturities, trading at fair value 5,223 4,803
Life Funds Withheld Assets | Collateralized debt obligations    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 0  
Fixed maturities, trading at fair value 0  
Life Funds Withheld Assets | Other asset-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 24,858 26,405
Fixed maturities, trading at fair value 25,965 25,700
Life Funds Withheld Assets | US States and political subdivisions of the States    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 0  
Fixed maturities, trading at fair value 0  
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 376,968 373,492
Fixed maturities, trading at fair value 417,411 370,261
Financial Services Sector | Life Funds Withheld Assets | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 400,872 344,070
Fixed maturities, trading at fair value 416,325 335,956
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 558,059 509,441
Fixed maturities, trading at fair value $ 592,848 $ 493,621