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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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