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NATURE OF OPERATIONS - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019
Disaggregation of revenue |  |  |  |  |
Incremental costs of obtaining a contract |  |  | true |  |
Dealer commission, reimbursed dealer expenses and other similar costs | $ 7,573 | $ 4,029 | $ 11,900 | $ 10,004 |
ASU 2014-09 |  |  |  |  |
Disaggregation of revenue |  |  |  |  |
Impact of adoption |  |  |  |  | $ 0

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