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Debt And Credit Agreements (Narrative) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Jun. 30, 2019
Dec. 31, 2019
USD ($)
Jun. 28, 2019
USD ($)
Mar. 01, 2016
USD ($)
Line of Credit Facility [Line Items]          
Credit spread over LIBOR, basis points (150.00%)        
Available credit under the Credit Agreement $ 370,000,000   $ 370,000,000    
Secured Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity $ 500,000,000   $ 500,000,000   $ 400,000,000
Line Of Credit Facility Term   5 years      
Line of credit facility, option to increase additional amount       $ 100,000,000  
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     3.00    
Line of credit facility, covenant terms, maximum aggregate distributions     $ 130,000,000    
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     $ 5,000,000    
Credit Facility, covenants, 50% of net income limitation when leverage ratio exceeds 3.00x     50.00%    
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%)