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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative, Fair Value, Net $ 8,726 $ 5,152 $ 3,134
Unsecured Debt $ 575,300 $ 427,500 $ 511,300