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Income Taxes - Valuation allowances, uncertain tax positions and accrued interest and penalties (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Valuation allowance |  |  |  |
Increase (decrease) in valuation allowance | $ 2,700 | $ 2,100 |  |
Interest and penalties |  |  |  |
Accrued interest or penalties for income tax liabilities | 100 | 200 | $ 100 |
Change in reserve for uncertain tax benefits |  |  |  |
Reserve at beginning of year | 2,923 | 427 | 107 |
Increases related to prior year tax positions | 277 | 2,500 | 427 |
Decreases related to prior year tax positions | (37) |  |  |
Lapse of statute of limitations |  | (4) | (107) |
Settlement | (2,663) |  |  |
Total | 500 | $ 2,923 | 427 |
Uncertain tax positions |  |  |  |
Uncertain tax positions that would impact of effective tax rate | 500 |  |  |
Unrecognized tax benefits estimated decrease | $ 500 |  |  |
Belgium |  |  |  |
Uncertain tax positions |  |  |  |
Total assessment |  |  | $ 0 | $ 0

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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