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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 28, 2020
Dec. 28, 2019
Statement of Financial Position [Abstract]    
Accounts Receivable, Allowance for Credit Loss, Current $ 222 $ 222
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment $ 277,017 $ 273,001
Preferred stock, par value (In dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (In shares) 10,000,000 10,000,000
Preferred stock, shares issued (In shares) 0 0
Preferred stock, shares outstanding (In shares) 0 0
Common stock, par value (In dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (In shares) 250,000,000 250,000,000
Common stock, shares issued (In shares) 76,158,251 75,764,990
Common stock, shares outstanding (In shares) 76,158,251 75,764,990