ACQUISITION - Intangible useful life (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Gears Acquisition
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years 8 months 12 days	9 years 3 months 18 days
Customer Relationships [Member] | Gears Acquisition
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Non-compete agreements [Member] | Gears Acquisition
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years