Segment Information (Income by Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 160,566	$ 165,051
Operating income	24,099	20,170
Equity income in unconsolidated joint ventures	613	919
Other income (expense), net	(546)	(129)
Interest expense, net	(1,121)	(1,006)
Income before income tax expense	23,045	19,954
Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	73,376	71,287
Operating income	15,900	12,868
Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	46,317	44,556
Operating income	5,305	3,033
Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	35,251	38,529
Operating income	1,296	2,391
Other
Segment Reporting Information [Line Items]
Net sales	5,622	10,679
Operating income	$ 1,598	$ 1,878