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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jul. 01, 2018
Dec. 31, 2017
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 963,243 965,213
Long-term portion (2) 903,257 944,882
Debt Instrument, Unamortized Discount [1] 981,276 984,806
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] 973,676 977,206
Short-term Debt [Member] | Estimate of Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term portion (2) 7,068 7,220
Long-term Debt [Member] | Estimate of Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term portion (2) [2] $ 896,189 $ 937,662
[1] Excluding net deferred financing costs
[2] Net of original issue discount.