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IMPAIRMENTS AND OTHER CHARGES - Narrative (Details) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) | Mar. 31, 2020 $ / bbl | Jan. 01, 2020 $ / bbl | Sep. 30, 2020 $ / bbl | Jun. 30, 2020 | Dec. 31, 2020 USD ($) reporting_unit
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  |  |  | 4
Number of reporting units with goodwill below their carrying values | reporting_unit |  |  |  |  |  | 2
Goodwill impairment |  |  |  |  |  | $ 36,435
COVID-19 |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  | 36,400
COVID-19 | Discount Rate | Minimum |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Reporting unit, measurement input | 0.148 |  |  |  |  |
COVID-19 | Discount Rate | Maximum |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Reporting unit, measurement input | 0.164 |  |  |  |  |
COVID-19 | Innovative Pumping Solutions |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  | $ 16,000
Oil spot price (in dollars per barrel) | $ / bbl |  | 21 | 63 | 41 |  |
Percentage decrease in average oil price per barrel |  |  |  | 0.28 | 0.35 |
Reduction in weighted average costs of capital | 100 |  |  |  |  |
Increase in revenue long-term growth rate projections | 0.10 |  |  |  |  |
COVID-19 | Canada |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Goodwill impairment | $ 20,500 |  |  |  |  |
Increase in revenue long-term growth rate projections | 0.0150 |  |  |  |  |
Percentage of fair value less than carrying amount of reporting unit | 40.00% |  |  |  |  |
Decrease in pre-tax discount rate | 0.0480 |  |  |  |  |

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