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Financial Instruments and Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Feb. 18, 2020
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Borrowings outstanding	$ 126,000		$ 126,000		$ 136,000
Interest expense	1,860	$ 1,410	3,626	$ 2,440
Payment of earn-out consideration paid within operating activities			1,215	(233)
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	1,400	0	1,400	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	10,880		10,880		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	163	114	321	118
Cash Flow Hedging [Member] \| Interest Rate Swap [Member] \| Credit Facility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Borrowings outstanding	126,000		126,000
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	10,880		10,880		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	164	313	295	400
Control Devices [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Interest expense	$ 108	$ 89	$ 240	$ 170
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