Debt And Credit Agreements (Narrative) (Details)	12 Months Ended
	Dec. 31, 2021 USD ($)
Line of Credit Facility [Line Items]
Available credit under the Credit Agreement	$ 287,000,000
Payments of Dividends	$ 200,000,000
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%