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Nature of Operations and Summary of Significant Accounting Policies - Revenue from Contract with Customers (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Revenue from Contract with Customer [Abstract]    
Accounts receivable $ 88,223 $ 89,624
Contract assets 2,183 2,374
Contract liabilities $ 54,525 $ 38,702