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Fair Value (Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure $ 6,580   $ 6,580     $ 6,349    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Included in other comprehensive income 18 $ 0 $ 40 $ 27        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis    
The following tables present a reconciliation of the beginning and ending balances of the Level 3 inputs for the three-month and the nine-month periods ended September 30, 2024 and 2023, for financial instruments measured on a recurring basis and classified as Level 3:

Level 3 Fair Value Measurements
Three months ended September 30, 2024 and 2023
(In thousands)Corporate debt securitiesEquity securitiesFair value
swap
Balance at July 1, 2024$6,427 $495 $(123)
Transfer into (out of) level 3— — — 
Total gains / (losses)  
Included in other income / other (expense)— 18 (500)
    Included in other comprehensive income153 — — 
Balance at September 30, 2024$6,580 $513 $(623)
Balance at July 1, 2023$6,116 $455 $(296)
Transfer into (out of) level 3, net— — — 
Total gains  
Included in other income— 11 — 
Included in other comprehensive income10 — — 
Purchases, sales, issuances and settlements, other, net— — 173 
Balance at September 30, 2023$6,126 $466 $(123)
Level 3 Fair Value Measurements
Nine months ended September 30, 2024 and 2023
(In thousands)Corporate debt securitiesEquity securitiesFair value
swap
Balance at January 1, 2024$6,349 $473 $(123)
Transfer into (out of) level 3— — — 
Total gains / (losses)
Included in other income / other (expense)— 40 (500)
    Included in other comprehensive income231 — — 
Balance at September 30, 2024$6,580 $513 $(623)
Balance at January 1, 2023$7,000 $439 $(243)
Transfers into (out of) level 3, net11 — — 
Total (losses) / gains
Included in other income / other (expense)— 27 (175)
Included in other comprehensive income(885)— — 
Purchases, sales, issuances and settlements, other, net— — 295 
Balance at September 30, 2023$6,126 $466 $(123)
          
Corporate Debt Securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 18,679   $ 18,679     17,897    
Fair Value, Recurring [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 7,861   7,861     2,089    
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Included in other comprehensive income   11            
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 153 10 231 (885)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 11        
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 513   513     473    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning 513 466 513 466 $ 495 473 $ 455 $ 439
Balance, ending 513 466 513 466 495 473 455 439
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Swap [Member]                
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning (623) (123) (623) (123) (123) (123) (296) (243)
Included in other comprehensive income (500) 0 (500) (175)        
Balance, ending (623) (123) (623) (123) (123) (123) (296) (243)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements)   173   295        
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning 6,580 6,126 6,580 6,126 6,427 6,349 6,116 7,000
Balance, ending $ 6,580 $ 6,126 $ 6,580 $ 6,126 $ 6,427 $ 6,349 $ 6,116 $ 7,000