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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 $ 1,587,004 $ 1,437,796
Fair Value 1,771,553 1,550,096
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,587,004 1,437,796
Gross Unrealized Gains 192,983 115,301
Gross Unrealized Losses 8,434 3,001
Allowance for Credit Losses 0  
Fair Value 1,771,553 1,550,096
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 14,775 14,983
Gross Unrealized Gains 1,277 1,032
Gross Unrealized Losses 0 0
Allowance for Credit Losses 0  
Fair Value 16,052 16,015
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 162,428 123,505
Gross Unrealized Gains 17,662 10,172
Gross Unrealized Losses 0 0
Allowance for Credit Losses 0  
Fair Value 180,090 133,677
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 69,664 70,287
Gross Unrealized Gains 9,164 6,993
Gross Unrealized Losses 34 0
Allowance for Credit Losses 0  
Fair Value 78,794 77,280
Fixed maturities | U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 734,382 627,880
Gross Unrealized Gains 123,756 70,167
Gross Unrealized Losses 1,687 527
Allowance for Credit Losses 0  
Fair Value 856,451 697,520
Fixed maturities | U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 225,446 222,952
Gross Unrealized Gains 16,527 10,416
Gross Unrealized Losses 1,367 153
Allowance for Credit Losses 0  
Fair Value 240,606 233,215
Fixed maturities | Foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 52,922 53,115
Gross Unrealized Gains 6,584 4,958
Gross Unrealized Losses 326 80
Allowance for Credit Losses 0  
Fair Value 59,180 57,993
Fixed maturities | Foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 162,044 161,597
Gross Unrealized Gains 5,135 4,505
Gross Unrealized Losses 4,892 2,210
Allowance for Credit Losses 0  
Fair Value 162,287 163,892
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 18,020 17,816
Gross Unrealized Gains 545 753
Gross Unrealized Losses 128 27
Allowance for Credit Losses 0  
Fair Value 18,437 18,542
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 143,676 141,593
Gross Unrealized Gains 11,698 5,796
Gross Unrealized Losses 0 0
Allowance for Credit Losses 0  
Fair Value 155,374 147,389
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,647 4,068
Gross Unrealized Gains 635 509
Gross Unrealized Losses 0 4
Allowance for Credit Losses 0  
Fair Value $ 4,282 4,573
OTTI | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   (50)
Net Unrealized Gain (Loss)   100
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   0
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   $ (50)