Segment Information (Income by Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net sales	$ 163,098	$ 153,495	$ 328,149	$ 300,135
Operating income	20,510	16,219	40,610	37,677
Equity income in unconsolidated joint ventures	392	1,062	1,311	2,039
Other income (expense), net	(517)	(76)	(646)	(1,268)
Interest expense, net	(1,304)	(720)	(2,310)	(1,468)
Income before income tax expense (benefit)	19,081	16,485	38,965	36,980
Reportable Segment [Member] | Advanced Connectivity Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	66,408	61,507	137,695	120,044
Operating income	12,046	10,300	24,883	22,260
Reportable Segment [Member] | Elastomeric Material Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	47,016	42,796	91,572	84,000
Operating income	5,533	4,580	8,548	10,310
Reportable Segment [Member] | Power Electronics Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	38,539	42,919	77,068	83,717
Operating income	851	(733)	3,219	832
Reportable Segment [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales	11,135	6,273	21,814	12,374
Operating income	$ 2,080	$ 2,072	$ 3,960	$ 4,275