Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 222,362	$ 235,764
Cost of goods sold	133,816	146,292
Gross profit	88,546	89,472
Selling, general, and administrative expenses	37,195	40,106
Technical and research expenses	9,481	9,130
Restructuring expenses, net	52	642
Operating income	41,818	39,594
Interest expense, net	3,569	3,977
Other expense/(income), net	600	15,569
Income before income taxes	37,649	20,048
Income tax expense	10,040	12,454
Net income	27,609	7,594
Net income/(loss) attributable to the noncontrolling interest	27	(1,515)
Net income attributable to the Company	$ 27,582	$ 9,109
Basic earnings per share (in dollars per share)	$ 0.85	$ 0.28
Diluted earnings per share (in dollars per share)	$ 0.85	$ 0.28
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Weighted average number of shares used in calculating basic net income per share (in shares)	32,352	32,312
Weighted average number of shares used in calculating diluted net income per share (in shares)	32,401	32,320
Dividends declared per share, Class A and Class B (in dollars per share)	$ 0.20	$ 0.19