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Investments - Amortized cost and fair value of trading securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading $ 1,263,609 $ 1,180
Amortized cost of short term investments, trading 60,176 0
Fixed maturities, trading, at fair value 1,235,699 1,171
Short-term investments, at fair value 60,330 0
Total investments trading 1,296,029 1,171
Life Funds Withheld Assets [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 1,263,609  
Amortized cost of short term investments, trading 60,176  
Trading Securities, Cost 1,323,785 1,180
Fixed maturities, trading, at fair value 1,235,699  
Short-term investments, at fair value 60,330  
Total investments trading 1,296,029 1,171
Life Funds Withheld Assets [Member] | U.S. Government and Government - Related/Supported [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 4,957  
Fixed maturities, trading, at fair value 4,990  
Life Funds Withheld Assets [Member] | 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 370  
Fixed maturities, trading, at fair value 368  
Life Funds Withheld Assets [Member] | Commercial Mortgage Backed Securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 4,874  
Fixed maturities, trading, at fair value 4,803  
Life Funds Withheld Assets [Member] | Other asset-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 26,405  
Fixed maturities, trading, at fair value 25,700  
Life Funds Withheld Assets [Member] | Non-U.S. Sovereign Government, Provincial, Supranational, and Government-Related/Supported [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 373,492  
Fixed maturities, trading, at fair value 370,261  
Financial Services Sector [Member] | Life Funds Withheld Assets [Member] | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 344,070  
Fixed maturities, trading, at fair value 335,956  
Non-Financial Services Sector [Member] | Life Funds Withheld Assets [Member] | Corporate    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized cost of fixed maturities, trading 509,441 1,180
Fixed maturities, trading, at fair value $ 493,621 $ 1,171