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Investments (Fixed Maturities Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 14,916,971 $ 12,465,746
Allowance for Credit Losses 568  
Fair Value 17,398,916 13,202,365
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 14,916,971 12,465,746
Gross Unrealized Gains 2,531,893 792,306
Gross Unrealized Losses 49,380 55,687
Allowance for Credit Losses 568  
Fair Value 17,398,916 13,202,365
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 7,203,259 6,667,347
Gross Unrealized Gains 1,928,710 491,943
Gross Unrealized Losses 12,705 39,466
Allowance for Credit Losses 0  
Fair Value 9,119,264 7,119,824
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 259,429 252,304
Gross Unrealized Gains 17,032 7,814
Gross Unrealized Losses 256 436
Allowance for Credit Losses 0  
Fair Value 276,205 259,682
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 160,922 203,386
Gross Unrealized Gains 21,978 19,518
Gross Unrealized Losses 19 20
Allowance for Credit Losses 0  
Fair Value 182,881 222,884
Fixed maturities | U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,691,422 1,615,060
Gross Unrealized Gains 278,335 126,947
Gross Unrealized Losses 7,392 1,331
Allowance for Credit Losses 0  
Fair Value 2,962,365 1,740,676
Fixed maturities | U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,509,192 1,159,962
Gross Unrealized Gains 111,697 50,720
Gross Unrealized Losses 6,114 3,343
Allowance for Credit Losses 217  
Fair Value 1,614,558 1,207,339
Fixed maturities | Foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 329,721 321,111
Gross Unrealized Gains 24,333 16,989
Gross Unrealized Losses 7,032 113
Allowance for Credit Losses 0  
Fair Value 347,022 337,987
Fixed maturities | Foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,233,676 1,171,411
Gross Unrealized Gains 77,343 50,069
Gross Unrealized Losses 11,890 7,995
Allowance for Credit Losses 351  
Fair Value 1,298,778 1,213,485
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 804,636 443,767
Gross Unrealized Gains 8,765 3,405
Gross Unrealized Losses 3,950 2,734
Allowance for Credit Losses 0  
Fair Value 809,451 444,438
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 649,810 557,584
Gross Unrealized Gains 57,148 20,941
Gross Unrealized Losses 19 236
Allowance for Credit Losses 0  
Fair Value 706,939 578,289
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 74,904 73,814
Gross Unrealized Gains 6,552 3,960
Gross Unrealized Losses 3 13
Allowance for Credit Losses 0  
Fair Value $ 81,453 77,761
OTTI | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   (20)
Net Unrealized Gains (Losses)   14,300
OTTI | Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   0
OTTI | Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   0
OTTI | Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   0
OTTI | Fixed maturities | U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   0
OTTI | Fixed maturities | U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   0
OTTI | Fixed maturities | Foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   0
OTTI | Fixed maturities | Foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   0
OTTI | Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   (20)
OTTI | Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   0
OTTI | Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   $ 0