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Organization and Summary of Significant Accounting Policies (Goodwill and Intangible Assets) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Indefinite-lived Intangible Assets [Line Items] |  |  |
Currency transaction adjustment gain (loss) | $ 900 | $ (2,700) | $ 300
Number of reportable segments | Segment | 4 |  |
Goodwill | $ 237,107 | 208,431 |
Indefinite-lived other intangible asset | 4,738 | 4,168 |
Definite-lived other intangible assets | 155,540 | 132,508 |
Advanced Connectivity Solutions |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | 51,693 | $ 51,693 |
Definite-lived other intangible assets | $ 11,100 |  |
Elastomeric Material Solutions |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Sensitivity analysis, Discount rate used | 11.00% |  |
Definite-lived other intangible assets | $ 128,100 |  |
Curamik Electronics Solutions |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Sensitivity analysis, Discount rate used | 12.30% |  |
Sensitivity analysis, Terminal year growth rate | 3.00% |  |
Goodwill | $ 71,615 |  |
Indefinite-lived other intangible asset | 4,700 |  |
Definite-lived other intangible assets | 16,400 |  |
Elastomer Component Division |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 2,224 |  |

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