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NATURE OF OPERATIONS - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue
Incremental costs of obtaining a contract			true
Product sales	$ 41,115	$ 39,179	$ 73,389	$ 70,375
Dealer commission, reimbursed dealer expenses and other similar costs	3,007	7,849	5,189	12,756
Revenue from contract with customer product and service benchmark | Customer concentration risk | Independent third party and affiliates
Disaggregation of Revenue
Product sales	$ 2,400	$ 14,320	$ 5,065	$ 26,306
Concentration risk percentage	5.80%	36.60%	6.80%	37.40%
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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