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Investments - Amortized cost and fair value of trading securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading $ 1,548,178 $ 1,263,609
Amortized cost of short term investments, trading 9,536 60,176
Fixed maturities, trading, at fair value 1,617,014 1,235,699
Short-term investments, at fair value 9,563 60,330
Total investments trading 1,626,577 1,296,029
Life Funds Withheld Assets    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,548,178 1,263,609
Amortized cost of short term investments, trading 9,536 60,176
Trading Securities, Cost 1,557,714 1,323,785
Fixed maturities, trading, at fair value 1,617,014 1,235,699
Short-term investments, at fair value 9,563 60,330
Total investments trading 1,626,577 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 14,361 4,957
Fixed maturities, trading, at fair value 14,708 4,990
Life Funds Withheld Assets | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 835 370
Fixed maturities, trading, at fair value 852 368
Life Funds Withheld Assets | RMBS - Non-Agency    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 101  
Fixed maturities, trading, at fair value 109  
Life Funds Withheld Assets | CMBS    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 5,242 4,874
Fixed maturities, trading, at fair value 5,526 4,803
Life Funds Withheld Assets | Other asset-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 38,342 26,405
Fixed maturities, trading, at fair value 39,446 25,700
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 219  
Fixed maturities, trading, at fair value 224  
Life Funds Withheld Assets | Non-U.S. Government    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 426,225 373,492
Fixed maturities, trading, at fair value 444,944 370,261
Financial Services Sector | Life Funds Withheld Assets | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 450,990 344,070
Fixed maturities, trading, at fair value 468,175 335,956
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 611,863 509,441
Fixed maturities, trading, at fair value $ 643,030 $ 493,621