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Debt (Schedule Of Debt) (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Aug. 03, 2016
Debt Instrument [Line Items]      
Revolving credit facility $ 25,000,000 $ 25,000,000  
Unamortized debt issuance costs (2,472,000) (3,065,000)  
Finance lease obligations [1] 10,276,000 4,213,000  
Other 4,000 9,000  
Total debt 294,833,000 295,777,000  
Less: current maturities 18,385,000 16,013,000  
Total long-term debt 276,448,000 279,764,000  
2016 Term Loan      
Debt Instrument [Line Items]      
Term loan $ 262,025,000 $ 269,620,000 $ 400,000,000.0
[1]
See Note 14 - Leases for further disclosure regarding finance lease obligations.