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Acquisitions (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 27, 2016 | Jan. 27, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |
Payments for acquisition, net of cash acquired |  |  | $ 0 | $ 7,863 | $ 0
International Polymerics, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percent of membership interests acquired | 100.00% |  |  |  |
Payments for acquisition, net of cash acquired | $ 7,900 |  |  |  |
Common stock, shares issued (in shares) | 247,764 |  |  |  |
Artificial Lift |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock, shares issued (in shares) |  | 60,024 |  |  |
Percent of assets acquired |  | 100.00% |  |  |
Consideration transferred, cash payments |  | $ 1,300 |  |  |

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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