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Investments (Fixed Maturities Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 14,517,513 $ 12,465,746
Allowance for Credit Losses 982  
Fair Value 16,894,879 13,202,365
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 14,517,513 12,465,746
Gross Unrealized Gains 2,448,803 792,306
Gross Unrealized Losses 70,455 55,687
Allowance for Credit Losses 982  
Fair Value 16,894,879 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 7,209,338 6,667,347
Gross Unrealized Gains 1,959,308 491,943
Gross Unrealized Losses 10,467 39,466
Allowance for Credit Losses 0  
Fair Value 9,158,179 7,119,824
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 244,211 252,304
Gross Unrealized Gains 15,004 7,814
Gross Unrealized Losses 5 436
Allowance for Credit Losses 0  
Fair Value 259,210 259,682
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 161,316 203,386
Gross Unrealized Gains 19,384 19,518
Gross Unrealized Losses 25 20
Allowance for Credit Losses 0  
Fair Value 180,675 222,884
Fixed maturities | U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,552,065 1,615,060
Gross Unrealized Gains 246,280 126,947
Gross Unrealized Losses 7,499 1,331
Allowance for Credit Losses 0  
Fair Value 2,790,846 1,740,676
Fixed maturities | U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,458,519 1,159,962
Gross Unrealized Gains 87,180 50,720
Gross Unrealized Losses 8,102 3,343
Allowance for Credit Losses 0  
Fair Value 1,537,597 1,207,339
Fixed maturities | Foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 317,646 321,111
Gross Unrealized Gains 20,654 16,989
Gross Unrealized Losses 7,671 113
Allowance for Credit Losses 0  
Fair Value 330,629 337,987
Fixed maturities | Foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,231,622 1,171,411
Gross Unrealized Gains 35,456 50,069
Gross Unrealized Losses 27,817 7,995
Allowance for Credit Losses 982  
Fair Value 1,238,279 1,213,485
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 621,254 443,767
Gross Unrealized Gains 6,735 3,405
Gross Unrealized Losses 8,846 2,734
Allowance for Credit Losses 0  
Fair Value 619,143 444,438
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 647,722 557,584
Gross Unrealized Gains 52,733 20,941
Gross Unrealized Losses 20 236
Allowance for Credit Losses 0  
Fair Value 700,435 578,289
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 73,820 73,814
Gross Unrealized Gains 6,069 3,960
Gross Unrealized Losses 3 13
Allowance for Credit Losses 0  
Fair Value $ 79,886 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