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Debt And Credit Agreements (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]    
Line of credit facility, maximum borrowing capacity $ 375,000,000 $ 500,000,000
Available credit under the Credit Agreement 241,000,000  
Payments of Dividends 200,000,000  
Credit Agreement, remaining aggregate dividend limit 75,000,000  
Credit Agreement, borrowing interval $ 25,000,000  
Credit Agreement, assets disposition limit 20.00%  
Secured Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of credit facility, covenant terms, maximum debt to EBITDA ratio 4.00  
Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio 3.00  
Line of credit facility, covenant terms, maximum aggregate distributions $ 75,000,000  
Credit Facility covenant leverage ratio three times limitation 3.00  
Credit Facility limitation on dividend payments at leverage ratio greater than 3.00x $ 4,750,000  
Credit Facility, covenants, 50% of net income limitation when leverage ratio exceeds 3.00x 50.00%