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Investments (Fixed Maturities Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 13,264,558 $ 12,465,746
Allowance for Credit Losses 186  
Fair Value 15,212,476 13,202,365
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 13,264,558 12,465,746
Gross Unrealized Gains 2,184,600 792,306
Gross Unrealized Losses 236,496 55,687
Allowance for Credit Losses 186  
Fair Value 15,212,476 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 7,215,283 6,667,347
Gross Unrealized Gains 2,004,094 491,943
Gross Unrealized Losses 5,644 39,466
Allowance for Credit Losses 0  
Fair Value 9,213,733 7,119,824
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 231,490 252,304
Gross Unrealized Gains 6,855 7,814
Gross Unrealized Losses 702 436
Allowance for Credit Losses 0  
Fair Value 237,643 259,682
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 171,762 203,386
Gross Unrealized Gains 12,886 19,518
Gross Unrealized Losses 1,240 20
Allowance for Credit Losses 0  
Fair Value 183,408 222,884
Fixed maturities | U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,834,541 1,615,060
Gross Unrealized Gains 92,000 126,947
Gross Unrealized Losses 38,870 1,331
Allowance for Credit Losses 0  
Fair Value 1,887,671 1,740,676
Fixed maturities | U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,176,551 1,159,962
Gross Unrealized Gains 25,154 50,720
Gross Unrealized Losses 37,188 3,343
Allowance for Credit Losses 186  
Fair Value 1,164,331 1,207,339
Fixed maturities | Foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 278,341 321,111
Gross Unrealized Gains 7,403 16,989
Gross Unrealized Losses 20,373 113
Allowance for Credit Losses 0  
Fair Value 265,371 337,987
Fixed maturities | Foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,209,280 1,171,411
Gross Unrealized Gains 2,195 50,069
Gross Unrealized Losses 105,708 7,995
Allowance for Credit Losses 0  
Fair Value 1,105,767 1,213,485
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 507,849 443,767
Gross Unrealized Gains 3,063 3,405
Gross Unrealized Losses 25,809 2,734
Allowance for Credit Losses 0  
Fair Value 485,103 444,438
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 562,409 557,584
Gross Unrealized Gains 27,558 20,941
Gross Unrealized Losses 449 236
Allowance for Credit Losses 0  
Fair Value 589,518 578,289
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 77,052 73,814
Gross Unrealized Gains 3,392 3,960
Gross Unrealized Losses 513 13
Allowance for Credit Losses 0  
Fair Value $ 79,931 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