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Debt - Schedule Of Debt (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Aug. 03, 2016
Debt Instrument [Line Items]      
Revolving credit facility $ 50,000,000 $ 25,000,000  
Unamortized debt issuance costs (1,879,000) (3,065,000)  
Finance lease liabilities 9,679,000 4,213,000  
Other 0 9,000  
Total debt 312,231,000 295,777,000  
Less: current maturities 18,092,000 16,013,000  
Total long-term debt 294,139,000 279,764,000  
2016 Term Loan      
Debt Instrument [Line Items]      
Term Loan 254,431,000 269,620,000 $ 400,000,000.0
Revolving Credit Facility | 2016 Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility $ 50,000,000 $ 25,000,000