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Summary of Significant Accounting Policies (Acquisitions Narrative) (Details) € in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2017 USD ($) | Jan. 31, 2017 EUR (€) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 EUR (€) | Jan. 31, 2017 EUR (€)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Earn-out consideration, operating and financing activities |  |  | $ 8,474 |  |  |  |  |  |
Payment of earn-out consideration paid within operating activities |  |  |  | $ (3,196) | $ 2,308 | $ 213 |  |  |
Earn-out consideration cash payment within financing activities |  |  |  |  | 3,394 |  |  |  |
Orlaco [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash | $ 79,675 | € 74,939 |  |  |  |  |  |  |
Cash paid to seller at closing | $ 71,701 |  |  |  |  |  |  |  | € 67,439
Acquisition payment held in escrow to secure payment for working capital and other adjustments | € |  |  |  |  |  |  |  |  | € 7,500
Expense related to fair value adjustment for earn-out consideration |  |  |  |  |  | $ 369 |  |  |
Orlaco [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [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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