Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)) - USD ($) $ in Thousands	Oct. 01, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 246,431	$ 228,984
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, par value (in usd per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	200,000	200,000
Preferred Stock, Shares Outstanding	0	0
Common stock, par value (in usd per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	30,414,184	30,278,668
Common stock held in treasury, at cost (in shares)	2,569,169	2,555,785
Disposal Group, Including Discontinued Operation, Liabilities, Current	$ 0	$ 18,086
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	$ 0	$ 1,171