CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Trade accounts receivable, allowances	$ 2,593	$ 2,184	$ 2,494
Treasury stock, shares	108	105	105
Common Stock
Common stock, par value (in dollars per share)	$ 0.694	$ 0.694	$ 0.694
Common stock, shares authorized	120,000	120,000	120,000
Common stock, shares issued	41,808	40,789	41,213
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.694	$ 0.694	$ 0.694
Common stock, shares authorized	40,000	40,000	40,000
Common stock, shares issued	31,179	30,286	30,309