CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 225,990	$ 273,949	$ 461,754	$ 525,321
Cost of goods sold	123,010	168,767	269,302	328,368
Gross profit	102,980	105,182	192,452	196,953
Selling, general, and administrative expenses	38,543	40,816	78,649	81,761
Technical and research expenses	8,873	9,242	18,003	19,491
Restructuring expenses, net	2,837	899	3,479	1,383
Operating income	52,727	54,225	92,321	94,318
Interest expense, net	3,823	4,631	7,800	9,048
Other expense/(income), net	1,091	930	16,660	(278)
Income before income taxes	47,813	48,664	67,861	85,548
Income tax expense	15,364	14,405	27,818	21,881
Net income	32,449	34,259	40,043	63,667
Net (loss)/income attributable to the noncontrolling interest	95	205	(1,420)	423
Net income attributable to the Company	$ 32,354	$ 34,054	$ 41,463	$ 63,244
Earnings per share attributable to Company shareholders - Basic (in dollars per share)	$ 1.00	$ 1.05	$ 1.28	$ 1.96
Earnings per share attributable to Company shareholders - Diluted (in dollars per share)	$ 1.00	$ 1.05	$ 1.28	$ 1.96
Shares of the Company used in computing earnings per share:
Weighted average number of shares outstanding, Basic (in shares)	32,328	32,299	32,320	32,286
Weighted average number of shares outstanding, Diluted (in shares)	32,336	32,311	32,328	32,298
Dividends declared per share (in dollars per share)	$ 0.19	$ 0.18	$ 0.38	$ 0.36