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Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 04, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss from discontinued operations |  | $ 18,241 | $ 5,406 | $ 582
Test and Inspection Services |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from divestiture of businesses | $ 4,000 |  |  |
Loss from discontinued operations | $ 10,034 |  |  |

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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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