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Debt (Schedule Of Debt) (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Aug. 03, 2016
Debt Instrument [Line Items]      
Revolving credit facility $ 125,000,000 $ 125,000,000  
Unamortized debt issuance costs (4,844,000) (5,437,000)  
Capitalized lease obligations 4,598,000 3,732,000  
Other 25,000 31,000  
Total debt 417,184,000 423,326,000  
Less: current maturities 15,318,000 15,030,000  
Total long-term debt 401,866,000 408,296,000  
2016 Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility 125,000,000 125,000,000  
2016 Term Loan      
Debt Instrument [Line Items]      
Term loan $ 292,405,000 $ 300,000,000 $ 400,000,000