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Investments - Amortized cost and fair value of trading securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading $ 1,367,908 $ 1,263,609
Fixed maturities, trading at fair value 1,409,583 1,235,699
Amortized cost of short-term investments, trading 26,949 60,176
Short-term investments, trading at fair value 26,959 60,330
Total investments, trading 1,436,542 1,296,029
Life Funds Withheld Assets    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,367,908 1,263,609
Fixed maturities, trading at fair value 1,409,583 1,235,699
Amortized cost of short-term investments, trading 26,949 60,176
Short-term investments, trading at fair value 26,959 60,330
Trading securities, cost 1,394,857 1,323,785
Total investments, trading 1,436,542 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 15,567 4,957
Fixed maturities, trading at fair value 15,267 4,990
Life Funds Withheld Assets | RMBS - Agency    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,917 370
Fixed maturities, trading at fair value 1,869 368
Life Funds Withheld Assets | Commercial mortgage-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 4,675 4,874
Fixed maturities, trading at fair value 4,760 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 25,457 26,405
Fixed maturities, trading at fair value 25,615 25,700
Life Funds Withheld Assets | Non-U.S. Sovereign Government, Provincial, Supranational, and Government-Related/Supported    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 390,986 373,492
Fixed maturities, trading at fair value 421,033 370,261
Financial Services Sector | Life Funds Withheld Assets | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 379,848 344,070
Fixed maturities, trading at fair value 382,755 335,956
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 549,458 509,441
Fixed maturities, trading at fair value $ 558,284 $ 493,621