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Debt (Schedule Of Debt) (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Aug. 03, 2016
Debt Instrument [Line Items]      
Revolving credit facility $ 25,000,000 $ 25,000,000  
Unamortized debt issuance costs (3,658,000) (4,251,000)  
Capitalized lease obligations 4,546,000 4,571,000  
Other 14,000 20,000  
Total debt 303,117,000 310,150,000  
Less: current maturities 15,625,000 15,364,000  
Total long-term debt 287,492,000 294,786,000  
2016 Term Loan      
Debt Instrument [Line Items]      
Term loan $ 277,215,000 $ 284,810,000 $ 400,000,000