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Debt - Schedule Of Debt (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Aug. 03, 2016
Debt Instrument [Line Items]      
Borrowings under revolving credit facility $ 25,000,000 $ 25,000,000  
Unamortized debt issuance costs (3,065,000) (4,251,000)  
Capitalized lease obligations, at weighted average interest rates from 2.5% to 5.0% payable in varying amounts through 2022 4,213,000 4,571,000  
Other, payable through 2019 9,000 20,000  
Debt and capital lease obligations 295,777,000 310,150,000  
Less: current maturities 16,013,000 15,364,000  
Total long-term debt $ 279,764,000 294,786,000  
Capital Lease Obligations | Minimum      
Debt Instrument [Line Items]      
Capital Lease weighted average interest rates 2.50%    
Capital Lease Obligations | Maximum      
Debt Instrument [Line Items]      
Capital Lease weighted average interest rates 5.00%    
2016 Term Loan      
Debt Instrument [Line Items]      
Term Loan $ 269,620,000 284,810,000 $ 400,000,000
Revolving Credit Facility | 2016 Revolving Credit Facility      
Debt Instrument [Line Items]      
Borrowings under revolving credit facility $ 25,000,000 $ 25,000,000