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Debt - Schedule Of Debt (Details) - USD ($)
Dec. 31, 2016
Aug. 03, 2016
Dec. 31, 2015
Dec. 31, 2013
Debt Instrument [Line Items]        
Borrowings under revolving credit facility $ 125,000,000   $ 0  
Unamortized debt issuance costs (5,437,000)   (3,813,000)  
Capitalized lease obligations, at weighted average interest rates from 2.5% to 5.0% payable in varying amounts through 2021 3,732,000   3,869,000  
Other, payable through 2019 31,000   44,000  
Debt and capital lease obligations 423,326,000   315,100,000  
Less: current maturities 15,030,000   17,541,000  
Total long-term debt $ 408,296,000   297,559,000  
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 $ 300,000,000 $ 400,000,000    
2013 Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowings under revolving credit facility     0  
2013 Term Loan        
Debt Instrument [Line Items]        
Term Loan     315,000,000 $ 350,000,000
Revolving Credit Facility | 2016 Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowings under revolving credit facility $ 125,000,000      
Revolving Credit Facility | 2013 Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowings under revolving credit facility     $ 0