Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 279,746	$ 268,089
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)	30,830,203	30,640,068
Treasury Stock, Common, Shares	2,636,393	2,607,841