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Debt (Schedule Of Debt) (Details) - USD ($)
Sep. 30, 2020
Mar. 02, 2020
Dec. 31, 2019
Aug. 03, 2016
Debt Instrument [Line Items]        
Revolving credit facility $ 0   $ 50,000,000  
Unamortized debt issuance costs (4,239,000)   (1,879,000)  
Finance lease liabilities 8,675,000   9,679,000  
Total debt 281,936,000   312,231,000  
Less: current maturities 9,693,000   18,092,000  
Total long-term debt 272,243,000   294,139,000  
2020 Revolving Credit Facility        
Debt Instrument [Line Items]        
Revolving credit facility 0      
2020 Term Loan        
Debt Instrument [Line Items]        
Term loan $ 277,500,000 $ 300,000,000.0    
2016 Revolving Credit Facility        
Debt Instrument [Line Items]        
Revolving credit facility     50,000,000  
2016 Term Loan        
Debt Instrument [Line Items]        
Term loan     $ 254,431,000 $ 400,000,000.0