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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 $ 5,405,062 $ 5,283,266
Allowance for Credit Losses 2,210  
Fair Value 5,545,597 5,681,970
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5,405,062 5,283,266
Gross Unrealized Gains 318,361 422,547
Gross Unrealized Losses 175,616 23,843
Allowance for Credit Losses 2,210  
Fair Value 5,545,597 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 86,893 83,622
Gross Unrealized Gains 3,948 2,846
Gross Unrealized Losses 0 0
Allowance for Credit Losses 0  
Fair Value 90,841 86,468
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 457,869 458,152
Gross Unrealized Gains 38,967 39,675
Gross Unrealized Losses 133 0
Allowance for Credit Losses 0  
Fair Value 496,703 497,827
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 190,467 196,034
Gross Unrealized Gains 14,633 26,793
Gross Unrealized Losses 1,431 1
Allowance for Credit Losses 0  
Fair Value 203,669 222,826
Fixed maturities | U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,023,128 1,914,503
Gross Unrealized Gains 189,922 229,071
Gross Unrealized Losses 57,630 2,247
Allowance for Credit Losses 0  
Fair Value 2,155,420 2,141,327
Fixed maturities | U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 904,725 886,281
Gross Unrealized Gains 26,295 44,497
Gross Unrealized Losses 17,176 1,006
Allowance for Credit Losses 2,210  
Fair Value 911,634 929,772
Fixed maturities | Foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 239,199 256,843
Gross Unrealized Gains 14,039 22,158
Gross Unrealized Losses 8,922 385
Allowance for Credit Losses 0  
Fair Value 244,316 278,616
Fixed maturities | Foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 951,060 939,603
Gross Unrealized Gains 6,941 38,426
Gross Unrealized Losses 82,798 19,551
Allowance for Credit Losses 0  
Fair Value 875,203 958,478
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 124,733 119,602
Gross Unrealized Gains 277 800
Gross Unrealized Losses 6,543 466
Allowance for Credit Losses 0  
Fair Value 118,467 119,936
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 362,722 367,848
Gross Unrealized Gains 19,592 15,231
Gross Unrealized Losses 444 163
Allowance for Credit Losses 0  
Fair Value 381,870 382,916
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 64,266 60,778
Gross Unrealized Gains 3,747 3,050
Gross Unrealized Losses 539 24
Allowance for Credit Losses 0  
Fair Value $ 67,474 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)