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Debt - Schedule Of Debt (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Capitalized Lease Obligations, at weighted average interest rates from 3.0% to 5.8% payable in varying amounts through 2020 $ 3,869,000 $ 2,883,000  
Other, payable through 2019 44,000 57,000  
Debt and capital lease obligations 318,913,000 335,440,000  
Less: current maturities 18,848,000 19,041,000  
Total long-term debt $ 300,065,000 316,399,000  
Capital Lease Obligations | Minimum      
Debt Instrument [Line Items]      
Capital Lease weighted average interest rates 3.00%    
Capital Lease Obligations | Maximum      
Debt Instrument [Line Items]      
Capital Lease weighted average interest rates 5.80%    
2013 Term Loan      
Debt Instrument [Line Items]      
Term Loan $ 315,000,000 $ 332,500,000 $ 350,000,000