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Investments - Amortized cost and fair value of trading securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading $ 1,724,250 $ 1,548,178
Fixed maturities, trading at fair value 1,772,877 1,617,014
Amortized cost of short-term investments, trading 0 9,536
Short-term investments, trading at fair value 0 9,563
Total investments trading 1,772,877 1,626,577
Life Funds Withheld Assets    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,724,250 1,548,178
Fixed maturities, trading at fair value 1,772,877 1,617,014
Amortized cost of short-term investments, trading 0 9,536
Short-term investments, trading at fair value 0 9,563
Trading securities, cost 1,724,250 1,557,714
Total investments trading 1,772,877 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 16,922 14,361
Fixed maturities, trading at fair value 16,308 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 74 219
Fixed maturities, trading at fair value 70 224
Life Funds Withheld Assets | Non-U.S. Governments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 455,646 426,225
Fixed maturities, trading at fair value 463,489 444,944
Life Funds Withheld Assets | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,203,351 1,062,853
Fixed maturities, trading at fair value 1,243,221 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 880 936
Fixed maturities, trading at fair value 838 961
Life Funds Withheld Assets | Commercial mortgage-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 7,101 5,242
Fixed maturities, trading at fair value 7,318 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 40,276 38,342
Fixed maturities, trading at fair value $ 41,633 $ 39,446