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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
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Investments, Fair Value Disclosure $ 0   $ 0  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Included in other comprehensive income $ 5 $ 7    
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 months ended March 31, 2021 and 2020, for financial instruments measured on a recurring basis and classified as Level 3:
Level 3 Fair Value Measurements
Three months ended March 31, 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 March 31, 2021$490 $(226)
Balance at January 1, 2020$456 $(226)
Total gains (losses)  
Included in other income7 — 
Balance at March 31, 2020$463 $(226)
      
Fair Value, Recurring [Member] | Equity Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Investments, Fair Value Disclosure $ 2,012   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   485  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning 490 463 485 $ 456
Balance, ending 490 463 485 456
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)
Included in other comprehensive income   0    
Balance, ending $ (226) $ (226) $ (226) $ (226)