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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 1,615 $ 1,803
Preferred stock, par value $ 1.000 $ 1.000
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 1.000 $ 1.000
Common stock, shares authorized 100,000,000 100,000,000
Common Stock, Shares, Outstanding 55,055,000 53,696,000
Treasury Stock, Shares 15,534,000 15,530,000