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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure $ 0   $ 0     $ 0    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Included in other comprehensive income 0 $ 0 $ (8) $ 5        
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 table below presents a reconciliation of the beginning and ending balances of the Level 3 inputs for the three-month and six-month periods ended June 30, 2022 and 2021, for financial instruments measured on a recurring basis and classified as Level 3:

Level 3 Fair Value Measurements
Three months ended June 30, 2022 and 2021
(In thousands)Equity
Securities		Fair value
swap
Balance at April 1, 2022$491 $(226)
Total losses  
Included in other income / expense— (221)
Balance at June 30, 2022$491 $(447)
Balance at April 1, 2021$490 $(226)
Total gains (losses)  
Included in other income / expense— — 
Balance at June 30, 2021$490 $(226)

Level 3 Fair Value Measurements
Six months ended June 30, 2022 and 2021
(In thousands)Equity
Securities		Fair value
swap
Balance at January 1, 2022$499 $(226)
Total losses  
Included in other income / expense(8)(221)
Balance at June 30, 2022$491 $(447)
Balance at January 1, 2021$485 $(226)
Total gains   
Included in other income / expense5 — 
Balance at June 30, 2021$490 $(226)
          
Fair Value, Recurring [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 1,785   $ 1,785     2,129    
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 491   491     499    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning 491 490 491 490 $ 491 499 $ 490 $ 485
Balance, ending 491 490 491 490 491 499 490 485
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 (447) (226) (447) (226) (226) (226) (226) (226)
Included in other comprehensive income (221) 0 (221) 0        
Balance, ending $ (447) $ (226) $ (447) $ (226) $ (226) $ (226) $ (226) $ (226)