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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Statement of Financial Position [Abstract]    
Accounts receivable - allowances $ 25,085 $ 88,128
Property, plant and equipment, accumulated depreciation $ 445,685 $ 431,914
Common stock, shares issued (in shares) 49,339 48,643
Common stock, shares outstanding (in shares) 49,339 48,643