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Segment Information (Income by Reportable Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Net sales | $ 214,611 | $ 203,828
Operating income | 31,044 | 39,037
Equity income in unconsolidated joint ventures | 1,007 | 1,009
Other income (expense), net | 66 | 1,119
Interest expense, net | (1,210) | (1,248)
Income before income tax expense | 30,907 | 39,917
Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 73,455 | 78,528
Operating income | 7,903 | 19,498
Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 78,083 | 76,864
Operating income | 14,159 | 12,790
Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 57,714 | 42,652
Operating income | 7,021 | 4,844
Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 5,359 | 5,784
Operating income | 1,961 | 1,905
Recognized over time |  |
Segment Reporting Information [Line Items] |  |
Net sales | 63,087 | 48,036
Recognized over time | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 0 | 0
Recognized over time | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,039 | 667
Recognized over time | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 57,400 | 42,273
Recognized over time | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 4,648 | 5,096
Recognized at a point in time |  |
Segment Reporting Information [Line Items] |  |
Net sales | 151,524 | 155,792
Recognized at a point in time | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 73,455 | 78,528
Recognized at a point in time | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 77,044 | 76,197
Recognized at a point in time | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 314 | 379
Recognized at a point in time | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 711 | 688
Segment Reconciling Items |  |
Segment Reporting Information [Line Items] |  |
Equity income in unconsolidated joint ventures | 1,007 | 1,009
Other income (expense), net | 66 | 1,119
Interest expense, net | (1,210) | (1,248)
United States |  |
Segment Reporting Information [Line Items] |  |
Net sales | 59,805 | 61,129
United States | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 12,278 | 13,220
United States | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 37,692 | 38,104
United States | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 8,578 | 8,590
United States | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,257 | 1,215
Other Americas |  |
Segment Reporting Information [Line Items] |  |
Net sales | 2,815 | 3,526
Other Americas | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 826 | 567
Other Americas | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,801 | 2,472
Other Americas | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 358 | 303
Other Americas | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | (170) | 184
Total Americas |  |
Segment Reporting Information [Line Items] |  |
Net sales | 62,620 | 64,655
Total Americas | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 13,104 | 13,787
Total Americas | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 39,493 | 40,576
Total Americas | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 8,936 | 8,893
Total Americas | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,087 | 1,399
China |  |
Segment Reporting Information [Line Items] |  |
Net sales | 65,040 | 62,047
China | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 33,507 | 37,423
China | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 20,794 | 16,915
China | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 9,422 | 6,367
China | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,317 | 1,342
Other APAC |  |
Segment Reporting Information [Line Items] |  |
Net sales | 31,742 | 31,902
Other APAC | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 15,338 | 15,924
Other APAC | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 9,160 | 9,944
Other APAC | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 6,451 | 5,119
Other APAC | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 793 | 915
Total APAC |  |
Segment Reporting Information [Line Items] |  |
Net sales | 96,782 | 93,949
Total APAC | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 48,845 | 53,347
Total APAC | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 29,954 | 26,859
Total APAC | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 15,873 | 11,486
Total APAC | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 2,110 | 2,257
Germany |  |
Segment Reporting Information [Line Items] |  |
Net sales | 23,871 | 20,486
Germany | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 6,250 | 6,075
Germany | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 2,742 | 2,293
Germany | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 14,710 | 11,935
Germany | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 169 | 183
Other EMEA |  |
Segment Reporting Information [Line Items] |  |
Net sales | 31,338 | 24,738
Other EMEA | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 5,256 | 5,319
Other EMEA | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 5,894 | 7,136
Other EMEA | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 18,195 | 10,338
Other EMEA | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,993 | 1,945
Total EMEA |  |
Segment Reporting Information [Line Items] |  |
Net sales | 55,209 | 45,224
Total EMEA | Advanced Connectivity Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 11,506 | 11,394
Total EMEA | Elastomeric Material Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 8,636 | 9,429
Total EMEA | Power Electronics Solutions |  |
Segment Reporting Information [Line Items] |  |
Net sales | 32,905 | 22,273
Total EMEA | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | $ 2,162 | $ 2,128

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