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Segment Information (Income by Reportable Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 157,489 | $ 163,098 | $ 318,056 | $ 328,149
Operating income | 18,756 | 20,582 | 42,856 | 40,752
Equity income in unconsolidated joint ventures | 708 | 392 | 1,321 | 1,311
Other income (expense), net | 191 | (517) | (356) | (646)
Interest expense, net | (1,115) | (1,304) | (2,236) | (2,310)
Income before income tax expense | 18,540 | 19,153 | 41,585 | 39,107
Advanced Connectivity Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 67,222 | 66,408 | 140,598 | 137,695
Operating income | 10,829 | 12,076 | 26,729 | 24,944
Elastomeric Material Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 45,767 | 47,016 | 92,084 | 91,572
Operating income | 5,348 | 5,548 | 10,653 | 8,581
Power Electronics Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 38,363 | 38,539 | 73,614 | 77,068
Operating income | 477 | 877 | 1,773 | 3,268
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 6,137 | 11,135 | 11,760 | 21,814
Operating income | $ 2,102 | $ 2,081 | $ 3,701 | $ 3,959

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