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Fair Value Of Financial Instruments (Schedule of Changes in Fair Value Associated with Level 3 Financial Instruments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Asset-Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 1,034 $ 1,034
Unrealized gains/(losses) (9) (9)
Realized gains/(losses)   (942)
Purchases 1,114 10,245
Sales   (8,189)
Net change 1,105 1,105
Ending Balance 2,139 2,139
Syndicated Loans [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 39,810 58,467
Unrealized gains/(losses) (6) 145
Purchases 16,893 26,963
Redemptions (5,398) (34,276)
Net change 11,489 (7,168)
Ending Balance 51,299 51,299
Corporate Equity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 17,074 15,565
Unrealized gains/(losses) (7) (7)
Realized gains/(losses)   (404)
Purchases 1,607 3,520
Net change 1,600 3,109
Ending Balance 18,674 18,674
Auction Rate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 554 558
Unrealized gains/(losses) 3 (1)
Net change 3 (1)
Ending Balance 557 557
Other Investment [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 13,640 14,348
Unrealized gains/(losses) (79) (32)
Realized gains/(losses)   (755)
Purchases 27 27
Net change (52) (760)
Ending Balance $ 13,588 $ 13,588