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Investments - Amortized cost and fair value of trading securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading $ 1,631,045 $ 1,548,178
Fixed maturities, trading at fair value 1,700,108 1,617,014
Amortized cost of short-term investments, trading 742 9,536
Short-term investments, trading at fair value 754 9,563
Total investments trading 1,700,862 1,626,577
Life Funds Withheld Assets    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,631,045 1,548,178
Fixed maturities, trading at fair value 1,700,108 1,617,014
Amortized cost of short-term investments, trading 742 9,536
Short-term investments, trading at fair value 754 9,563
Trading securities, cost 1,631,787 1,557,714
Total investments trading 1,700,862 1,626,577
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 16,179 14,361
Fixed maturities, trading at fair value 16,340 14,708
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 127 219
Fixed maturities, trading at fair value 126 224
Life Funds Withheld Assets | Non-U.S. Governments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 454,585 426,225
Fixed maturities, trading at fair value 469,597 444,944
Life Funds Withheld Assets | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,115,185 1,062,853
Fixed maturities, trading at fair value 1,167,081 1,111,205
Life Funds Withheld Assets | Residential mortgage-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 919 936
Fixed maturities, trading at fair value 930 961
Life Funds Withheld Assets | Commercial mortgage-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 5,194 5,242
Fixed maturities, trading at fair value 5,550 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 38,856 38,342
Fixed maturities, trading at fair value $ 40,484 $ 39,446