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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, 2018 USD ($) age | Dec. 31, 2017 USD ($) | Dec. 31, 2016 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) | $ 1,281 | $ 1,397 | $ 783
Interest cost | 199 | 188 | 243
Expected return on plan assets | (327) | (199) | (157)
Amortization of unrecognized actuarial gain | 18 | 45 |
Net periodic pension cost | $ 1,171 | $ 1,431 | $ 869

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