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Investments - Amortized cost and fair value of trading securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading $ 1,965,372 $ 1,946,501
Fixed maturities, trading at fair value 1,990,344 2,006,385
Amortized cost of short-term investments, trading 5,777 14,969
Short-term investments, trading at fair value 5,788 14,965
Life Funds Withheld Assets    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,965,372 1,946,501
Fixed maturities, trading at fair value 1,990,344 2,006,385
Amortized cost of short-term investments, trading 5,777 14,969
Short-term investments, trading at fair value 5,788 14,965
Trading securities, cost 1,971,149 1,961,470
Total investments trading 1,996,132 2,021,350
Life Funds Withheld Assets | U.S. Government and Government Agencies    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 9,524 11,640
Fixed maturities, trading at fair value 9,633 11,042
Life Funds Withheld Assets | US States, municipalities and political subdivisions of the States    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading   30
Fixed maturities, trading at fair value   31
Life Funds Withheld Assets | Non-U.S. Governments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 476,698 473,849
Fixed maturities, trading at fair value 489,276 485,171
Life Funds Withheld Assets | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,428,176 1,412,846
Fixed maturities, trading at fair value 1,440,572 1,460,292
Life Funds Withheld Assets | Residential mortgage-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 985 1,020
Fixed maturities, trading at fair value 919 932
Life Funds Withheld Assets | Commercial mortgage-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 7,227 7,345
Fixed maturities, trading at fair value 7,411 7,580
Life Funds Withheld Assets | Other asset-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 42,762 39,771
Fixed maturities, trading at fair value $ 42,533 $ 41,337