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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
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 $ 8 $ 5 $ 15        
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 tables below present a reconciliation of the beginning and ending balances of the Level 3 inputs for the three-month and six-month periods ended June 30, 2021 and 2020, for financial instruments measured on a recurring basis and classified as Level 3:

Level 3 Fair Value Measurements
Three months ended June 30, 2021 and 2020
(In thousands)Equity
Securities		Fair value
swap
Balance at April 1, 2021$490 $(226)
Total gains (losses)  
Included in other income— — 
Balance at June 30, 2021$490 $(226)
Balance at April 1, 2020$463 $(226)
Total gains (losses)  
Included in other income8 — 
Balance at June 30, 2020$471 $(226)

Level 3 Fair Value Measurements
Six months ended June 30, 2021 and 2020
(In thousands)Equity
Securities		Fair value
swap
Balance at January 1, 2021$485 $(226)
Total gains (losses)  
Included in other income5 — 
Balance at June 30, 2021$490 $(226)
Balance at January 1, 2020$456 $(226)
Total gains (losses)  
Included in other income15 — 
Balance at June 30, 2020$471 $(226)
          
Fair Value, Recurring [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 1,973   $ 1,973     2,511    
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 490   490     485    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning 490 471 490 471 $ 490 485 $ 463 $ 456
Balance, ending 490 471 490 471 490 485 463 456
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 (226) (226) (226) (226) (226) (226) (226) (226)
Included in other comprehensive income   0   0        
Balance, ending $ (226) $ (226) $ (226) $ (226) $ (226) $ (226) $ (226) $ (226)