Represents the cash outflow from payments for earn-out consideration.

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Payments for earn out consideration from operating and financing activities.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Nominal or face amount used to calculate payment on derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into (out of) level 3 of the fair value hierarchy.

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Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Fair value of the amount outstanding under the credit facility.

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Fair value portion of other liabilities.

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Financial Instruments and Fair Value Measurements (Narrative) (Details) € in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 18, 2020 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Borrowings outstanding		$ 136,000	$ 126,000
Assets fair value adjustment		0	0
Impairment of Goodwill		0	0	$ 0
Payment of earn-out consideration paid within operating activities		(3,196)	2,308	213
Earn-out consideration cash payment within financing activities			3,394
Earn-out consideration, operating and financing activities	$ 8,474
Transfers in or out of Level 3		0
Asset impairments		2,326
Particulate Matter Fixed Assets [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Asset impairments		2,326
Euro-Denominated Foreign Currency Forward Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Gain (loss) on derivative instruments held for trading purposes, net				73
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
Cash Flow Hedging [Member] \| Mexican Peso-Denominated Foreign Currency Forward Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts		1,242	0
Cash Flow Hedging [Member] \| Interest Rate Swap [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts					$ 50,000
Interest expense		433
Cash Flow Hedging [Member] \| Interest Rate Swap [Member] \| Credit Facility [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Borrowings outstanding		136,000
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		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
Not Designated as Hedging Instrument [Member] \| Euro-Denominated Foreign Currency Forward Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts		0	0	$ 0				$ 1,486
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
Orlaco [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Earn-out consideration						$ 7,500	€ 7,500
Payment of earn-out consideration paid within operating activities			5,080
Earn-out consideration cash payment within financing activities			$ 3,394