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NATURE OF OPERATIONS - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue |  |
Incremental costs of obtaining a contract | true |
Product sales | $ 32,274 | $ 31,195
Dealer commission, reimbursed dealer expenses and other similar costs | 2,182 | 4,907
Revenue from contract with customer product and service benchmark | Customer concentration risk | Independent third party and affiliates |  |
Disaggregation of Revenue |  |
Product sales | $ 2,664 | $ 11,986
Concentration risk percentage | 8.30% | 37.20%
Minimum |  |
Disaggregation of Revenue |  |
Term of lease agreement | 96 months |
Maximum |  |
Disaggregation of Revenue |  |
Term of lease agreement | 120 months |

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