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Debt and Credit Arrangements - Schedule of Long Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 25, 2016
Debt and Credit Arrangements    
Outstanding debt $ 470,000 $ 300,575
Unamortized debt issuance costs (3,435) (755)
Current portion of long-term debt (20,000)  
Total long-term debt, less current portion, net $ 446,565 $ 299,820