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NATURE OF OPERATIONS - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue
Incremental costs of obtaining a contract			true
Product sales	$ 48,300	$ 36,566	$ 121,689	$ 106,940
Dealer commission, reimbursed dealer expenses and other similar costs	3,978	7,073	8,976	15,878
Revenue from contract with customer product and service benchmark | Customer concentration risk | Independent third party and affiliates
Disaggregation of Revenue
Product sales	$ 2,335	$ 13,253	$ 7,399	$ 39,559
Concentration risk percentage	4.80%	36.20%	6.10%	37.00%
Minimum
Disaggregation of Revenue
Term of lease agreement	96 months		96 months
Maximum
Disaggregation of Revenue
Term of lease agreement	120 months		120 months

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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