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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion $ 7,600 $ 7,613
Bank indebtedness and other long-term debt, net of deferred financing costs, less current portion 965,213 968,266
debt, net of unamortized issue discount 984,806 991,878
Debt Instrument, Fair Value Disclosure 944,882 1,000,934
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion [1] 7,600 7,613
Bank indebtedness and other long-term debt, net of deferred financing costs, less current portion [1] 977,206 984,265
Estimate of Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term Debt, Fair Value [1] 7,220 7,623
Long-term Debt, Fair Value [1] $ 937,662 $ 993,311
[1] (1) Excluding net deferred financing costs.