CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net sales	$ 172,331	$ 181,324
Cost of goods sold	99,830	104,640
Gross profit	72,501	76,684
Selling, general and administrative expenses	39,421	35,233
Technical, product engineering, and research expenses	10,132	12,301
Restructuring expenses, net	679	9,001
Operating income	22,269	20,149
Interest expense, net	2,238	2,676
Other income, net	(328)	(3,285)
Income before income taxes	20,359	20,758
Income tax expense	7,043	8,519
Net income	13,316	12,239
Net (loss)/income attributable to the noncontrolling interest	(185)	26
Net income attributable to the Company	$ 13,501	$ 12,213
Earnings per share attributable to Company shareholders - Basic	$ 0.42	$ 0.38
Earnings per share attributable to Company shareholders - Diluted	$ .42	$ .38
Shares of the Company used in computing earnings per share:
Basic	32,041	31,882
Diluted	32,081	31,972
Dividends declared per share, Class A and Class B	$ 0.17	$ 0.16