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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative, Fair Value, Net $ 7,648 $ 5,152 $ 3,284
Unsecured Debt $ 706,300 $ 427,500 $ 612,500