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Investments - Amortized cost and fair value of trading securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading $ 1,946,501 $ 1,548,178
Amortized cost of short term investments, trading 14,969 9,536
Fixed maturities, trading, at fair value 2,006,385 1,617,014
Short-term investments, at fair value 14,965 9,563
Total investments trading 2,021,350 1,626,577
Life Funds Withheld Assets    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,946,501 1,548,178
Amortized cost of short term investments, trading 14,969 9,536
Total investments amortized cost 1,961,470 1,557,714
Fixed maturities, trading, at fair value 2,006,385 1,617,014
Short-term investments, at fair value 14,965 9,563
Total investments trading 2,021,350 1,626,577
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 11,640 14,361
Fixed maturities, trading, at fair value 11,042 14,708
Life Funds Withheld Assets | U.S. States and political subdivisions of the States    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 30 219
Fixed maturities, trading, at fair value 31 224
Life Funds Withheld Assets | Non-U.S. Governments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 473,849 426,225
Fixed maturities, trading, at fair value 485,171 444,944
Life Funds Withheld Assets | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,412,846 1,062,853
Fixed maturities, trading, at fair value 1,460,292 1,111,205
Life Funds Withheld Assets | RMBS    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,020 936
Fixed maturities, trading, at fair value 932 961
Life Funds Withheld Assets | CMBS    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 7,345 5,242
Fixed maturities, trading, at fair value 7,580 5,526
Life Funds Withheld Assets | Other asset-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 39,771 38,342
Fixed maturities, trading, at fair value $ 41,337 $ 39,446