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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 30, 2017
Statement of Financial Position [Abstract]    
Accounts receivable - allowances $ 12,096 $ 14,001
Property, plant and equipment, accumulated depreciation $ 468,237 $ 453,319
Common stock, shares issued (in shares) 50,473,848 49,518,000
Common stock, shares outstanding (in shares) 50,473,848 49,518,000