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Debt (Schedule Of Debt) (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Aug. 03, 2016
Debt Instrument [Line Items]      
Revolving credit facility $ 25,000,000 $ 25,000,000  
Unamortized debt issuance costs (2,768,000) (3,065,000)  
Finance lease obligations [1] 10,910,000 4,213,000  
Other 5,000 9,000  
Total debt 298,970,000 295,777,000  
Less: current maturities 18,532,000 16,013,000  
Total long-term debt 280,438,000 279,764,000  
2016 Term Loan      
Debt Instrument [Line Items]      
Term loan $ 265,823,000 $ 269,620,000 $ 400,000,000.0
[1] See Note 14 - Leases for further disclosure regarding finance lease obligations.