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Debt (Schedule Of Debt) (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Mar. 02, 2020
Aug. 03, 2016
Debt Instrument [Line Items]        
Unamortized debt issuance costs $ (3,520,000) $ (4,000,000)    
Finance lease liabilities 9,199,000 9,966,000    
Total debt 276,242,000 276,529,000    
Less: current maturities 16,589,000 16,910,000    
Total long-term debt 259,653,000 259,619,000    
2020 Revolving Credit Facility        
Debt Instrument [Line Items]        
Revolving credit facility 0 0    
2020 Term Loan        
Debt Instrument [Line Items]        
Term loan $ 270,563,000 $ 270,563,000 $ 300,000,000.0  
2016 Term Loan        
Debt Instrument [Line Items]        
Term loan       $ 400,000,000.0