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Employee Benefit Plan - Net Periodic Pension Costs (Details) - Non-U.S. Plan $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) age | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Plan information |  |  |
Required rate of return under Belgian law, employer contributions | 1.60% |  |
Required rate of return under Belgian law, employee contributions | 1.60% |  |
Benefit rights vests upon statutory retirement age | age | 62 |  |
Net periodic pension costs |  |  |
Service cost (gross) | $ 1,549 | $ 1,164 | $ 1,281
Interest cost | 106 | 234 | 199
Expected return on plan assets | (271) | (242) | (327)
Amortization of unrecognized actuarial gain | (40) | (22) | 18
Net periodic pension cost | $ 1,344 | $ 1,134 | $ 1,171

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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