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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Jul. 01, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative, Fair Value, Net $ 8,404 $ 5,152 $ 3,049
Unsecured Debt $ 543,000 $ 427,500 $ 455,000