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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

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