Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Income [Abstract]
Net sales	$ 709,868	$ 745,345	$ 757,414
Cost of goods sold	431,182	453,710	466,860
Gross profit	278,686	291,635	290,554
Selling, general and administrative expenses	146,192	147,198	157,688
Technical, product engineering, and research expenses	44,753	59,128	55,667
Restructuring and other, net	$ 23,846	5,759	$ 25,108
Pension settlement expense		8,190
Operating income	$ 63,895	71,360	$ 52,091
Interest income	(1,857)	(1,541)	(1,468)
Interest expense	11,841	12,254	15,227
Other expense/(income), net	2,433	(6,853)	7,256
Income before income taxes	51,478	67,500	31,076
Income tax (benefit)/expense	(5,787)	25,751	13,372
Income from continuing operations	$ 57,265	$ 41,749	17,704
Loss from operations of discontinued businesses			(75)
Income tax benefit on discontinued operations			(29)
Loss from discontinued operations			(46)
Net income	$ 57,265	$ 41,749	17,658
Net (loss)/income attributable to the noncontrolling interest	(14)	180	141
Net income attributable to the Company	$ 57,279	$ 41,569	$ 17,517
Earnings per share attributable to Company shareholders - Basic
Income from continuing operations	$ 1.79	$ 1.31	$ 0.55
Discontinued operations	0.00	0.00	0.00
Net Income attributable to the Company	1.79	1.31	0.55
Earnings per share attributable to Company shareholders - Diluted
Income from continuing operations	1.79	1.30	0.55
Discontinued operations	0.00	0.00	0.00
Net Income attributable to the Company	1.79	1.30	0.55
Dividends declared per share, Class A and Class B	$ 0.67	$ 0.63	$ 0.59