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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

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