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Summary of Investments - SOI Fixed Maturity AFS and non-credit OTTI in AOCI (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Securities available-for-sale    
Amortized cost $ 21,392,504 $ 21,672,727
Fixed maturities available-for-sale: 22,242,518 22,153,703
Fixed maturities    
Securities available-for-sale    
Amortized cost 21,392,504 21,672,727
Gross unrealized gains 1,039,342 871,205
Gross unrealized losses 189,328 390,229
Fixed maturities available-for-sale: 22,242,518 22,153,703
OTTI (gain) loss included in AOCI (70,875) (73,929)
U.S. government direct obligations and U.S. agencies    
Securities available-for-sale    
Amortized cost 1,389,029 3,022,279
Gross unrealized gains 51,604 47,791
Gross unrealized losses 8,998 34,958
Fixed maturities available-for-sale: 1,431,635 3,035,112
OTTI (gain) loss included in AOCI 0 0
Obligations of U.S. states and their subdivisions    
Securities available-for-sale    
Amortized cost 1,879,906 1,890,568
Gross unrealized gains 230,856 214,411
Gross unrealized losses 2,195 6,317
Fixed maturities available-for-sale: 2,108,567 2,098,662
OTTI (gain) loss included in AOCI 0 0
Corporate debt securities    
Securities available-for-sale    
Amortized cost 14,559,716 13,811,597
Gross unrealized gains 617,225 477,316
Gross unrealized losses 150,546 309,164
Fixed maturities available-for-sale: 15,026,395 13,979,749
OTTI (gain) loss included in AOCI (1,167) (1,488)
Perpetual debt investments    
Securities available-for-sale    
Amortized cost 115,037 135,187
Fixed maturities available-for-sale: 108,631 113,239
Asset-backed securities    
Securities available-for-sale    
Amortized cost 1,624,832 1,226,493
Gross unrealized gains 112,104 104,274
Gross unrealized losses 14,758 18,388
Fixed maturities available-for-sale: 1,722,178 1,312,379
OTTI (gain) loss included in AOCI (69,573) (72,464)
Residential mortgage-backed securities    
Securities available-for-sale    
Amortized cost 73,038 138,292
Gross unrealized gains 2,849 3,867
Gross unrealized losses 797 1,167
Fixed maturities available-for-sale: 75,090 140,992
OTTI (gain) loss included in AOCI (135) 23
Commercial mortgage-backed securities    
Securities available-for-sale    
Amortized cost 1,286,766 1,222,257
Gross unrealized gains 22,924 23,207
Gross unrealized losses 12,003 20,182
Fixed maturities available-for-sale: 1,297,687 1,225,282
OTTI (gain) loss included in AOCI 0 0
Collateralized debt obligations    
Securities available-for-sale    
Amortized cost 579,217 361,241
Gross unrealized gains 1,780 339
Gross unrealized losses 31 53
Fixed maturities available-for-sale: 580,966 361,527
OTTI (gain) loss included in AOCI $ 0 $ 0