IMPAIRMENTS AND OTHER CHARGES - Narrative (Details) $ in Thousands				3 Months Ended		9 Months Ended
	Jul. 31, 2020 USD ($)	Mar. 31, 2020 $ / bbl	Jan. 01, 2020 $ / bbl	Sep. 30, 2020 USD ($) reporting_unit $ / bbl	Jun. 30, 2020	Sep. 30, 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		2
Goodwill impairment				$ 36,435		$ 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	0.0100
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