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Debt And Credit Agreements (Narrative) (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Mar. 01, 2016
USD ($)
Line of Credit Facility [Line Items]      
Credit spread over LIBOR, basis points (15000.00%) (150.00%)  
Available credit under the Credit Agreement $ 298,000,000 $ 298,000,000  
Secured Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 400,000,000
Line Of Credit Facility Term   5 years  
Line of credit facility, option to increase additional amount     $ 50,000,000
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   2.50  
Line of credit facility, covenant terms, maximum aggregate distributions   $ 100,000,000  
Line of credit facility, covenant terms, percentage of shareholders' equity to net income   50.00%  
Credit Facility covenant leverage ratio three times limitation   3.00  
Credit Facility limitation on dividend payments at leverage ratio greater than 3.00x   $ 4,000,000  
Credit Facility, covenants, 50% of net income limitation when leverage ratio exceeds 3.00x   50.00%  
Credit Facility covenant three point five times leverage ratio   350.00%  
Credit Facility fixed charge coverage one pt two ratio limitation   120.00%  
Indebtedness To Adjusted Ebitda Ratio Less Than Or Equal To One [Member]      
Line of Credit Facility [Line Items]      
Credit spread over LIBOR, basis points   (1.50%)