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Debt (Schedule Of Debt) (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2013
Debt Instrument [Line Items]      
Revolving credit facility $ 125,000,000 $ 0  
Unamortized debt issuance costs (5,734,000) (3,813,000)  
Capitalized lease obligations 3,977,000 3,869,000  
Other 34,000 44,000  
Total debt 523,277,000 315,100,000  
Less: current maturities 19,889,000 17,541,000  
Total long-term debt 503,388,000 297,559,000  
2016 Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility 125,000,000    
2013 Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility   0  
2016 Term Loan      
Debt Instrument [Line Items]      
Term loan $ 400,000,000    
2013 Term Loan      
Debt Instrument [Line Items]      
Term loan   $ 315,000,000 $ 350,000,000