CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,147	$ 1,007
Property, plant and equipment, accumulated depreciation	$ 391,898	$ 381,584
Capital Stock, par value (in dollars per share)	$ 1	$ 1
Capital Stock, authorized shares (in shares)	50,000	50,000
Capital Stock, shares issued (in shares)	18,616	18,574
Capital Stock, shares outstanding (in shares)	18,616	18,574