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Investments (Narrative) (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
USD ($)
security
item
Dec. 31, 2023
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
Fair value $ 454,465 $ 472,503
Number of investments in a single issuer exceeds 10% of shareholders' equity | item 0  
Percent of shareholders equity benchmark for investments in a single issuer 10.00%  
Number of debt securities | security 551 564
Fair value of temporarily impaired securities $ 437,039 $ 458,186
Unrealized Losses 49,563 49,554
Equity securities 352 427
Corporate [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair value $ 23,688 $ 23,198
Number of debt securities | security 167 51
Fair value of temporarily impaired securities $ 23,688 $ 23,198
Unrealized Losses 2,658 3,138
Public Funds And Trust Deposits [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair value $ 231,000 $ 207,400
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Number of equity investments | item 1