Segment Information (Income by Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 203,828	$ 160,566
Operating income	39,441	24,099
Equity income in unconsolidated joint ventures	1,009	613
Other income (expense), net	715	(546)
Interest expense, net	(1,248)	(1,121)
Income before income tax expense	39,917	23,045
Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales	78,543	73,376
Operating income	19,689	15,900
Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales	76,849	46,317
Operating income	12,912	5,305
Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales	42,651	35,251
Operating income	4,935	1,296
Other
Segment Reporting Information [Line Items]
Net sales	5,785	5,622
Operating income	$ 1,905	$ 1,598