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Discontinued Operations - Additional Disclosures (Details) $ in Millions |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 16, 2017 USD ($) | May 22, 2017 USD ($) | Dec. 31, 2016 segment | Dec. 31, 2017 USD ($) | May 23, 2017 USD ($)
Discontinued Operations and Disposal Groups [Abstract] |  |  |  |  |
Number of segments with assets and liabilities classified as discontinued operations (segment) | segment |  |  | 2 |  |
Discontinued Operations, Disposed of by Sale | Drilling Technologies |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash consideration | $ 1.0 |  |  |  |
Note receivables | $ 1.0 |  |  |  |
Notes receivable due, period | 1 year |  |  |  |
Discontinued Operations, Disposed of by Sale | Production Technologies |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash consideration |  |  |  |  | $ 2.9
Escrow deposit |  |  |  |  | $ 0.4
Discontinued Operations, Disposed of by Sale | National Oilwell Varco, L.P. | Drilling Technologies |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash consideration |  | $ 17.0 |  |  |
Escrow deposit |  | $ 1.5 |  |  |
Term of escrow deposit |  | 18 months |  |  |
Drilling Technologies And Production Technologies |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Accounts receivable |  |  |  | $ 0.3 |
Sales price hold-back |  |  |  | 1.4 |
Accrued liabilities |  |  |  | $ 1.4 |

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- Definition Disposal Group, Including Discontinued Operation, Assumed By Continuing Operations, Accounts Receivable, Current + References No definition available. + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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