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Summary of Investments - SOI Fixed Maturity AFS and non-credit OTTI in AOCI (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Securities available-for-sale    
Amortized cost $ 22,125,948 $ 21,672,727
Fixed maturities available-for-sale: 23,012,869 22,153,703
Fixed maturities    
Securities available-for-sale    
Amortized cost 22,125,948 21,672,727
Gross unrealized gains 1,039,206 871,205
Gross unrealized losses 152,285 390,229
Fixed maturities available-for-sale: 23,012,869 22,153,703
OTTI (gain) loss included in AOCI (66,925) (73,929)
U.S. government direct obligations and U.S. agencies    
Securities available-for-sale    
Amortized cost 1,502,617 3,022,279
Gross unrealized gains 49,176 47,791
Gross unrealized losses 8,333 34,958
Fixed maturities available-for-sale: 1,543,460 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 1,884,136 1,890,568
Gross unrealized gains 228,301 214,411
Gross unrealized losses 1,619 6,317
Fixed maturities available-for-sale: 2,110,818 2,098,662
OTTI (gain) loss included in AOCI 0 0
Corporate debt securities    
Securities available-for-sale    
Amortized cost 14,991,367 13,811,597
Gross unrealized gains 622,399 477,316
Gross unrealized losses 118,566 309,164
Fixed maturities available-for-sale: 15,495,200 13,979,749
OTTI (gain) loss included in AOCI (1,088) (1,488)
Perpetual debt investments    
Securities available-for-sale    
Amortized cost 115,037 135,187
Fixed maturities available-for-sale: 111,141 113,239
Asset-backed securities    
Securities available-for-sale    
Amortized cost 1,578,590 1,226,493
Gross unrealized gains 110,333 104,274
Gross unrealized losses 12,173 18,388
Fixed maturities available-for-sale: 1,676,750 1,312,379
OTTI (gain) loss included in AOCI (65,696) (72,464)
Residential mortgage-backed securities    
Securities available-for-sale    
Amortized cost 68,946 138,292
Gross unrealized gains 2,618 3,867
Gross unrealized losses 645 1,167
Fixed maturities available-for-sale: 70,919 140,992
OTTI (gain) loss included in AOCI (141) 23
Commercial mortgage-backed securities    
Securities available-for-sale    
Amortized cost 1,375,325 1,222,257
Gross unrealized gains 22,547 23,207
Gross unrealized losses 10,920 20,182
Fixed maturities available-for-sale: 1,386,952 1,225,282
OTTI (gain) loss included in AOCI 0 0
Collateralized debt obligations    
Securities available-for-sale    
Amortized cost 724,967 361,241
Gross unrealized gains 3,832 339
Gross unrealized losses 29 53
Fixed maturities available-for-sale: 728,770 361,527
OTTI (gain) loss included in AOCI $ 0 $ 0