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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 |  |  |  |  |

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