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EQUITY-BASED COMPENSATION - Equity Options (Details) - Equity options - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 28, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense | $ 1.0 | $ 1.4 | $ 2.3 | $ 2.7 |  |
Unrecognized compensation expense | $ 2.2 |  | $ 2.2 |  |  |
Weighted-average period for recognition (in years) |  |  | 1 year |  |  |
Class A Common Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share Price |  |  |  |  | $ 11.61 | $ 6.32

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