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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]      
Allowance for credit losses, Period beginning balance $ 9,724 $ 3,969  
Allowance for credit losses, Period ending balance 37,599 8,781  
Accrued investment income 48,427   $ 48,247
Current provision for securities without prior allowance 18,588 5,667  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 3,463 (677)  
Reductions for securities sold (1,395) (178)  
Reductions for securities identified as intent (or requirement) to sell during the period (1,099) 0  
Debt Securities, Available-for-sale, Fair Value 6,598,822   6,709,976
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 61,993   246,301
Fixed income securities, available-for-sale, amortized cost 6,717,907   6,490,753
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 143,479   17,354
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 8,318    
Available-for-sale Securities | U.S. Government and Government Agencies [Member]      
Debt Securities, Available-for-sale [Line Items]      
Allowance for credit losses, Period beginning balance 0    
Allowance for credit losses, Period ending balance 0    
Debt Securities, Available-for-sale, Fair Value 127,093   130,458
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 490   3,629
Fixed income securities, available-for-sale, amortized cost 131,986   127,974
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 5,383   1,145
Available-for-sale Securities | Foreign Government [Member]      
Debt Securities, Available-for-sale [Line Items]      
Allowance for credit losses, Period beginning balance 46 1  
Allowance for credit losses, Period ending balance 150 56  
Current provision for securities without prior allowance 103 56  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 1 (1)  
Reductions for securities sold 0 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0  
Debt Securities, Available-for-sale, Fair Value 16,703   15,860
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 145   609
Fixed income securities, available-for-sale, amortized cost 17,160   15,420
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 452   123
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0    
Available-for-sale Securities | Obligations of States and Political Subdivisions [Member]      
Debt Securities, Available-for-sale [Line Items]      
Allowance for credit losses, Period beginning balance 137 4  
Allowance for credit losses, Period ending balance 1,991 201  
Current provision for securities without prior allowance 1,732 186  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 132 11  
Reductions for securities sold (10) 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0  
Debt Securities, Available-for-sale, Fair Value 1,125,431   1,189,308
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 15,329   68,258
Fixed income securities, available-for-sale, amortized cost 1,122,132   1,121,422
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 10,039   235
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0    
Available-for-sale Securities | Corporate Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Allowance for credit losses, Period beginning balance 6,682 2,782  
Allowance for credit losses, Period ending balance 23,066 6,166  
Current provision for securities without prior allowance 15,393 4,058  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 3,337 (527)  
Reductions for securities sold (1,247) (147)  
Reductions for securities identified as intent (or requirement) to sell during the period (1,099) 0  
Debt Securities, Available-for-sale, Fair Value 2,387,740   2,573,603
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 25,658   106,890
Fixed income securities, available-for-sale, amortized cost 2,445,468   2,478,348
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 60,320   4,953
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0    
Available-for-sale Securities | Collateralized Loan Obligations and Other Asset Backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Allowance for credit losses, Period beginning balance 939 592  
Allowance for credit losses, Period ending balance 2,283 1,470  
Current provision for securities without prior allowance 1,288 1,001  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 59 (106)  
Reductions for securities sold (3) (17)  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0  
Debt Securities, Available-for-sale, Fair Value 1,417,214   1,350,814
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 7,974   14,350
Fixed income securities, available-for-sale, amortized cost 1,444,224   1,343,687
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 32,701   6,284
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0    
Available-for-sale Securities | Residential Mortgage Backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Allowance for credit losses, Period beginning balance 1,909 561  
Allowance for credit losses, Period ending balance 10,029 864  
Current provision for securities without prior allowance 0 356  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (63) (39)  
Reductions for securities sold (135) (14)  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0  
Debt Securities, Available-for-sale, Fair Value 877,959   776,252
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,779   24,813
Fixed income securities, available-for-sale, amortized cost 903,800   756,280
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 22,591   2,932
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 8,318    
Available-for-sale Securities | Commercial Mortgage Backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Allowance for credit losses, Period beginning balance 11 29  
Allowance for credit losses, Period ending balance 80 24  
Current provision for securities without prior allowance 72 10  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (3) (15)  
Reductions for securities sold 0 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 $ 0  
Debt Securities, Available-for-sale, Fair Value 646,682   673,681
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,618   27,752
Fixed income securities, available-for-sale, amortized cost 653,137   647,622
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 11,993   1,682
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0    
Available-for-sale Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Accrued investment income $ 46,800   $ 46,300