Organization and Summary of Significant Accounting Policies (Goodwill and Intangible Assets) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Number of reportable segments | Segment	4
Current Fiscal Year End Date	--12-31
Goodwill	$ 264,885	$ 237,107
Indefinite-lived other intangible asset	4,525	4,738
Definite-lived other intangible assets	172,483	155,540
Advanced Connectivity Solutions
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 51,693	51,693
Elastomeric Material Solutions
Indefinite-lived Intangible Assets [Line Items]
Sensitivity analysis, Discount rate used	11.25%
Goodwill	$ 142,589	111,575
Elastomeric Material Solutions | Measurement Input, Long-term Revenue Growth Rate
Indefinite-lived Intangible Assets [Line Items]
Sensitivity analysis, Terminal year growth rate	0.059
Curamik
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived other intangible asset	$ 4,500
Elastomer Component Division
Indefinite-lived Intangible Assets [Line Items]
Sensitivity analysis, Discount rate used	12.90%
Elastomer Component Division | Measurement Input, Long-term Revenue Growth Rate
Indefinite-lived Intangible Assets [Line Items]
Sensitivity analysis, Terminal year growth rate	0.049
Power Electronics Solutions
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 68,379	71,615
Other
Indefinite-lived Intangible Assets [Line Items]
Goodwill	2,224	$ 2,224
ACS
Indefinite-lived Intangible Assets [Line Items]
Definite-lived other intangible assets	7,900
EMS
Indefinite-lived Intangible Assets [Line Items]
Definite-lived other intangible assets	152,200
Curamik
Indefinite-lived Intangible Assets [Line Items]
Definite-lived other intangible assets	$ 12,400