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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]          
Allowance for credit losses, Period beginning balance $ 6,011 $ 10,395 $ 3,969 $ 0  
Allowance for credit losses, Period ending balance 7,169 7,180 7,169 7,180  
Interest and dividends due or accrued 46,082   46,082   $ 45,004
Current provision for securities without prior allowance 1,666 1,025 5,139 8,100  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (333) (3,856) (1,087) 0  
Reductions for securities sold (95) (362) (711) (830)  
Reductions for securities identified as intent (or requirement) to sell during the period (80) (22) (141) (90)  
Debt Securities, Available-for-sale, Fair Value 6,677,070   6,677,070   6,455,928
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 293,966   293,966   397,922
Fixed income securities, available-for-sale, amortized cost 6,401,167   6,401,167   6,073,517
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 10,894   10,894   11,542
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   0    
Debt Securities, Available-for-sale, Fair Value 131,058   131,058   116,140
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,600   3,600   6,239
Fixed income securities, available-for-sale, amortized cost 128,415   128,415   110,038
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 957   957   137
Available-for-sale Securities | Foreign Government [Member]          
Debt Securities, Available-for-sale [Line Items]          
Allowance for credit losses, Period beginning balance 49 28 1 0  
Allowance for credit losses, Period ending balance 47 7 47 7  
Current provision for securities without prior allowance 0 0 47 26  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (2) (2) (1) 0  
Reductions for securities sold 0 (19) 0 (19)  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0  
Debt Securities, Available-for-sale, Fair Value 15,140   15,140   18,366
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 695   695   1,569
Fixed income securities, available-for-sale, amortized cost 14,567   14,567   16,801
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 75   75   3
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 38 17 4 0  
Allowance for credit losses, Period ending balance 99 15 99 15  
Current provision for securities without prior allowance 61 9 84 15  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 0 (11) 11 0  
Reductions for securities sold 0 0 0 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0  
Debt Securities, Available-for-sale, Fair Value 1,165,924   1,165,924   1,247,137
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 71,507   71,507   87,564
Fixed income securities, available-for-sale, amortized cost 1,094,619   1,094,619   1,159,588
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 103   103   11
Available-for-sale Securities | Corporate Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Allowance for credit losses, Period beginning balance 3,477 8,077 2,782 0  
Allowance for credit losses, Period ending balance 4,719 5,358 4,719 5,358  
Current provision for securities without prior allowance 1,307 1,016 3,413 6,100  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 64 (3,455) (765) 0  
Reductions for securities sold (49) (265) (570) (659)  
Reductions for securities identified as intent (or requirement) to sell during the period (80) (15) (141) (83)  
Debt Securities, Available-for-sale, Fair Value 2,544,526   2,544,526   2,328,052
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 131,442   131,442   180,971
Fixed income securities, available-for-sale, amortized cost 2,420,904   2,420,904   2,152,203
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3,101   3,101   2,340
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 1,399 1,389 592 0  
Allowance for credit losses, Period ending balance 926 1,121 926 1,121  
Current provision for securities without prior allowance 46 0 573 1,237  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (517) (210) (219) 0  
Reductions for securities sold (2) (51) (20) (109)  
Reductions for securities identified as intent (or requirement) to sell during the period 0 (7) 0 (7)  
Debt Securities, Available-for-sale, Fair Value 1,339,801   1,339,801   1,026,551
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 18,896   18,896   20,166
Fixed income securities, available-for-sale, amortized cost 1,326,348   1,326,348   1,014,820
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 4,517   4,517   7,843
Available-for-sale Securities | Residential Mortgage Backed Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Allowance for credit losses, Period beginning balance 1,034 831 561 0  
Allowance for credit losses, Period ending balance 1,363 647 1,363 647  
Current provision for securities without prior allowance 248 0 1,018 690  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 125 (157) (95) 0  
Reductions for securities sold (44) (27) (121) (43)  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0  
Debt Securities, Available-for-sale, Fair Value 816,782   816,782   1,051,788
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 33,361   33,361   53,065
Fixed income securities, available-for-sale, amortized cost 785,840   785,840   999,485
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,056   1,056   201
Available-for-sale Securities | Commercial Mortgage Backed Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Allowance for credit losses, Period beginning balance 14 53 29 0  
Allowance for credit losses, Period ending balance 15 32 15 32  
Current provision for securities without prior allowance 4 0 4 32  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (3) (21) (18) 0  
Reductions for securities sold 0 0 0 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 $ 0 0 $ 0  
Debt Securities, Available-for-sale, Fair Value 663,839   663,839   667,894
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 34,465   34,465   48,348
Fixed income securities, available-for-sale, amortized cost 630,474   630,474   620,582
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,085   1,085   1,007
Available-for-sale Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Interest and dividends due or accrued $ 44,900   $ 44,900   $ 43,800