Organization and Summary of Significant Accounting Policies (Goodwill and Intangible Assets) (Details) $ in Thousands	12 Months Ended
	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