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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure $ 6,427   $ 6,427     $ 6,349    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Included in other comprehensive income 0 $ 0 $ 22 $ 16        
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 six-month periods ended June 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 June 30, 2024 and 2023
(In thousands)Corporate debt securitiesEquity securitiesFair value
swap
Balance at April 1, 2024$6,372 $495 $(123)
Transfer into (out of) level 3— — — 
Total gains  
Included in other income— — — 
    Included in other comprehensive income55 — — 
Balance at June 30, 2024$6,427 $495 $(123)
Balance at April 1, 2023$6,855 $449 $(121)
Transfer into (out of) level 3, net(611)— — 
Total (losses) / gains  
Included in other income / other (expense)— 6 (175)
Included in other comprehensive income(128)— — 
Balance at June 30, 2023$6,116 $455 $(296)
Level 3 Fair Value Measurements
Six months ended June 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
Included in other income— 22 — 
    Included in other comprehensive income78 — — 
Balance at June 30, 2024$6,427 $495 $(123)
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)— 16 (175)
Included in other comprehensive income(895)— — 
Purchases, sales, issuances and settlements, other, net— — 122 
Balance at June 30, 2023$6,116 $455 $(296)
          
Corporate Debt Securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 18,744   $ 18,744     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 2,870   2,870     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   6            
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) 55 (128) 78 (895)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 (611) 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 495   495     473    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning 495 455 495 455 $ 495 473 $ 449 $ 439
Balance, ending 495 455 495 455 495 473 449 439
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 (123) (296) (123) (296) (123) (123) (121) (243)
Included in other comprehensive income 0 (175) 0 (175)        
Balance, ending (123) (296) (123) (296) (123) (123) (121) (243)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements)       122        
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 6,427 6,116 6,427 6,116 6,372 6,349 6,855 7,000
Balance, ending $ 6,427 $ 6,116 $ 6,427 $ 6,116 $ 6,372 $ 6,349 $ 6,855 $ 7,000