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Segment Information (Income by Reportable Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 201,424 | $ 157,489 | $ 405,252 | $ 318,056
Operating income | 32,759 | 18,756 | 72,200 | 42,856
Equity income in unconsolidated joint ventures | 966 | 708 | 1,976 | 1,321
Other income (expense), net | (185) | 191 | 530 | (356)
Interest expense, net | (1,947) | (1,115) | (3,195) | (2,236)
Income before income tax expense | 31,593 | 18,540 | 71,511 | 41,585
Advanced Connectivity Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 74,340 | 67,222 | 152,882 | 140,598
Operating income | 13,208 | 10,829 | 32,897 | 26,729
Elastomeric Material Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 77,585 | 45,767 | 154,434 | 92,084
Operating income | 14,068 | 5,348 | 26,980 | 10,653
Power Electronics Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 43,905 | 38,363 | 86,557 | 73,614
Operating income | 3,660 | 477 | 8,595 | 1,773
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 5,594 | 6,137 | 11,379 | 11,760
Operating income | $ 1,823 | $ 2,102 | $ 3,728 | $ 3,701

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