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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 $ 5,624,060 $ 5,283,266
Allowance for Credit Losses 2,533  
Fair Value 6,280,086 5,681,970
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5,624,060 5,283,266
Gross Unrealized Gains 689,303 422,547
Gross Unrealized Losses 30,744 23,843
Allowance for Credit Losses 2,533  
Fair Value 6,280,086 5,681,970
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 89,216 83,622
Gross Unrealized Gains 3,336 2,846
Gross Unrealized Losses 0 0
Allowance for Credit Losses 0  
Fair Value 92,552 86,468
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 460,613 458,152
Gross Unrealized Gains 54,387 39,675
Gross Unrealized Losses 0 0
Allowance for Credit Losses 0  
Fair Value 515,000 497,827
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 194,959 196,034
Gross Unrealized Gains 38,344 26,793
Gross Unrealized Losses 102 1
Allowance for Credit Losses 0  
Fair Value 233,201 222,826
Fixed maturities | U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,086,357 1,914,503
Gross Unrealized Gains 369,055 229,071
Gross Unrealized Losses 5,174 2,247
Allowance for Credit Losses 0  
Fair Value 2,450,238 2,141,327
Fixed maturities | U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 912,038 886,281
Gross Unrealized Gains 80,388 44,497
Gross Unrealized Losses 2,661 1,006
Allowance for Credit Losses 968  
Fair Value 988,797 929,772
Fixed maturities | Foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 241,710 256,843
Gross Unrealized Gains 33,770 22,158
Gross Unrealized Losses 3,478 385
Allowance for Credit Losses 0  
Fair Value 272,002 278,616
Fixed maturities | Foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 959,879 939,603
Gross Unrealized Gains 67,985 38,426
Gross Unrealized Losses 18,204 19,551
Allowance for Credit Losses 1,565  
Fair Value 1,008,095 958,478
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 168,513 119,602
Gross Unrealized Gains 785 800
Gross Unrealized Losses 1,078 466
Allowance for Credit Losses 0  
Fair Value 168,220 119,936
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 456,095 367,848
Gross Unrealized Gains 36,910 15,231
Gross Unrealized Losses 47 163
Allowance for Credit Losses 0  
Fair Value 492,958 382,916
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 54,680 60,778
Gross Unrealized Gains 4,343 3,050
Gross Unrealized Losses 0 24
Allowance for Credit Losses 0  
Fair Value $ 59,023 63,804
OTTI | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   (138)
Net Unrealized Gains (Losses)   1,700
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   (7)
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   $ (131)