CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net sales	$ 251,373	$ 223,603
Cost of goods sold	159,602	145,821
Gross profit	91,771	77,782
Selling, general, and administrative expenses	40,945	41,888
Technical and research expenses	10,249	10,317
Restructuring expenses, net	484	8,573
Operating income	40,093	17,004
Interest expense, net	4,417	4,288
Other (income)/expense, net	(1,208)	1,452
Income before income taxes	36,884	11,264
Income tax expense	7,476	3,365
Net income	29,408	7,899
Net income attributable to the noncontrolling interest	218	237
Net income attributable to the Company	$ 29,190	$ 7,662
Earnings per share attributable to Company shareholders - Basic	$ 0.90	$ 0.24
Earnings per share attributable to Company shareholders - Diluted	$ 0.90	$ 0.24
Shares of the Company used in computing earnings per share:
Basic	32,272	32,220
Diluted	32,285	32,236
Dividends declared per share, Class A and Class B	$ 0.18	$ 0.17