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Financial Instruments and Fair Value Measurements (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Feb. 18, 2020 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Borrowings outstanding	$ 130,000		$ 130,000		$ 136,000
Interest expense	1,447	$ 1,882	5,073	$ 4,322
Payment of earn-out consideration paid within operating activities			1,453	(3,045)
Transfers in or out of Level 3			0
Cash Flow Hedging [Member] | U.S. Dollar Denominated Foreign Currency Forward Contracts Euro Functional Currency [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	0	800	0	800	0
Cash Flow Hedging [Member] | Mexican Peso-Denominated Foreign Currency Forward Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	12,653		12,653		1,242
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts						$ 50,000
Interest expense	165	156	486	274
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Credit Facility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Borrowings outstanding	$ 130,000		$ 130,000
Net Investment Hedging [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Number of hedge contracts | contract	2		2
Net Investment Hedging [Member] | Net Investment Hedge Due 2026 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	$ 25,000		$ 25,000
Net Investment Hedging [Member] | Net Investment Hedge Due 2028 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	25,000		25,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Forward Currency Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	12,653		12,653		1,242
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	50,000		50,000		50,000
Electronics [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Interest expense	228	103	523	503
Control Devices [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Interest expense	$ 122	99	$ 362	269
Control Devices [Member] | Particulate Matter Fixed Assets [Member] | Tallinn, Estonia Facility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Asset impairments					$ 2,326
Control Devices [Member] | Selling, General and Administrative Expenses [Member] | Particulate Matter Fixed Assets [Member] | Tallinn, Estonia Facility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Asset impairments		$ 2,326		$ 2,326

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