CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 211,999	$ 271,133	$ 673,753	$ 796,454
Cost of goods sold	124,697	167,026	393,999	495,394
Gross profit	87,302	104,107	279,754	301,060
Selling, general, and administrative expenses	39,518	39,841	118,167	121,602
Technical and research expenses	8,301	8,832	26,304	28,323
Restructuring expenses, net	710	(244)	4,189	1,139
Operating income	38,773	55,678	131,094	149,996
Interest expense, net	2,242	3,987	10,042	13,035
Other expense/(income), net	(2,745)	(1,628)	13,915	(1,906)
Income before income taxes	39,276	53,319	107,137	138,867
Income tax expense	9,686	13,194	37,504	35,075
Net income	29,590	40,125	69,633	103,792
Net income/(loss) attributable to the noncontrolling interest	1	116	(1,419)	539
Net income attributable to the Company	$ 29,589	$ 40,009	$ 71,052	$ 103,253
Earnings per share attributable to Company shareholders - Basic (in dollars per share)	$ 0.92	$ 1.24	$ 2.20	$ 3.20
Earnings per share attributable to Company shareholders - Diluted (in dollars per share)	$ 0.91	$ 1.24	$ 2.20	$ 3.20
Shares of the Company used in computing earnings per share:
Weighted average number of shares outstanding, Basic (in shares)	32,337	32,306	32,326	32,293
Weighted average number of shares outstanding, Diluted (in shares)	32,344	32,317	32,333	32,305
Dividends declared per share (in dollars per share)	$ 0.19	$ 0.18	$ 0.57	$ 0.54