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Debt (Schedule Of Debt) (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2013
Debt Instrument [Line Items]      
Revolving Credit Facility $ 220,000,000 $ 0  
Unamortized debt issuance costs (3,159,000) (3,813,000)  
Capitalized lease obligations 4,066,000 3,869,000  
Other 38,000 44,000  
Total debt 527,195,000 315,100,000  
Less: current maturities 17,354,000 17,541,000  
Total long-term debt 509,841,000 297,559,000  
2013 Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving Credit Facility 220,000,000 0  
2013 Term Loan      
Debt Instrument [Line Items]      
Term Loan $ 306,250,000 $ 315,000,000 $ 350,000,000.0