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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, Current [1] $ 7,600 $ 7,600
Bank indebtedness and other long-term debt, less current portion 959,874 961,514
Long-term portion (2) 974,769 892,263
Debt Instrument, Unamortized Discount [1] 974,217 977,747
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank indebtedness and other long-term debt, less current portion [1],[2] 966,617 970,147
Short-term Debt [Member] | Estimate of Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term portion (2) 7,548 7,051
Long-term Debt [Member] | Estimate of Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term portion (2) [2] $ 967,221 $ 885,212
[1] Excluding net deferred financing costs
[2] Net of original issue discount.