CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 203,190	$ 172,289	$ 375,521	$ 353,613
Cost of goods sold	124,875	117,697	224,705	222,337
Gross profit	78,315	54,592	150,816	131,276
Selling, general and administrative expenses	43,534	39,932	82,955	75,165
Technical, product engineering, and research expenses	10,276	10,411	20,408	22,712
Restructuring expenses, net	6,648	1,211	7,327	10,212
Operating income	17,857	3,038	40,126	23,187
Interest expense, net	3,691	2,702	5,929	5,378
Other (income)/expense, net	(2,017)	2,820	(2,345)	(465)
Income/(loss) before income taxes	16,183	(2,484)	36,542	18,274
Income tax expense/(benefit)	6,082	(364)	13,125	8,155
Net income/(loss)	10,101	(2,120)	23,417	10,119
Net (loss)/income attributable to the noncontrolling interest	(266)	52	(451)	78
Net income/(loss) attributable to the Company	$ 10,367	$ (2,172)	$ 23,868	$ 10,041
Earnings/(loss) per share attributable to Company shareholders - Basic	$ 0.32	$ (0.07)	$ 0.74	$ 0.31
Earnings/(loss) per share attributable to Company shareholders - Diluted	$ 0.32	$ (0.07)	$ 0.74	$ 0.31
Shares of the Company used in computing earnings per share:
Basic	32,093	31,999	32,067	31,941
Diluted	32,131	31,999	32,106	32,015
Dividends per share, Class A and Class B	$ 0.17	$ 0.17	$ 0.34	$ 0.33