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Debt (Schedule Of Debt) (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Aug. 03, 2016
Debt Instrument [Line Items]      
Revolving credit facility $ 0 $ 25,000,000  
Unamortized debt issuance costs (2,175,000) (3,065,000)  
Finance lease obligations [1] 9,980,000 4,213,000  
Other 0 9,000  
Total debt 266,033,000 295,777,000  
Less: current maturities 18,196,000 16,013,000  
Total long-term debt 247,837,000 279,764,000  
2016 Term Loan      
Debt Instrument [Line Items]      
Term loan $ 258,228,000 $ 269,620,000 $ 400,000,000.0
[1]
See Note 14 - Leases for further disclosure regarding finance lease obligations.