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Debt - Schedule Of Debt (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Aug. 03, 2016
Debt Instrument [Line Items]      
Borrowings under revolving credit facility $ 25,000,000 $ 125,000,000  
Unamortized debt issuance costs (4,251,000) (5,437,000)  
Capitalized lease obligations, at weighted average interest rates from 2.5% to 5.0% payable in varying amounts through 2023 4,571,000 3,732,000  
Other, payable through 2019 20,000 31,000  
Debt and capital lease obligations 310,150,000 423,326,000  
Less: current maturities 15,364,000 15,030,000  
Total long-term debt $ 294,786,000 408,296,000  
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 $ 284,810,000 300,000,000 $ 400,000,000
Revolving Credit Facility | 2016 Revolving Credit Facility      
Debt Instrument [Line Items]      
Borrowings under revolving credit facility $ 25,000,000 $ 125,000,000