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Debt (Schedule Of Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Debt Instrument [Line Items]      
Unamortized debt issuance costs $ (3,486) $ (3,813)  
Capitalized lease obligations 4,226 3,869  
Other 40 44  
Total debt 311,405 315,100  
Less: current maturities 17,447 17,541  
Total long-term debt 293,958 297,559  
2013 Term Loan      
Debt Instrument [Line Items]      
Term Loan $ 310,625 $ 315,000 $ 350,000