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Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Revenue from Contract with Customer [Abstract]    
Trade receivables $ 241,287 $ 260,455
Contract assets (current) 483 300
Contract assets (long-term) 4,026 2,350
Contract liabilities $ 41,374 $ 54,527