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EQUITY-BASED COMPENSATION - Performance share units (Details) - Performance share units $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) item | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of times shares issued for each performance share settlement | item |  |  | 1 |  |
Grant date fair value of PSUs |  |  | $ 6.9 |  | $ 5.9
Compensation expense | $ 0.8 | $ 0.4 | 1.7 | $ 0.6 |
Fair value of outstanding shares |  |  | 11.8 |  |
Unrecognized compensation expense | $ 8.6 |  | $ 8.6 |  |
Weighted-average remaining life |  |  | 1 year 9 months 18 days |  |
Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of times shares issued for each performance share settlement | item |  |  | 0 |  |
Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of times shares issued for each performance share settlement | item |  |  | 1.75 |  |
Return on assets Less than 9.6% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of Target PSUs Earned |  |  | 0.00% |  |
Return on assets 9.6% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of Target PSUs Earned |  |  | 50.00% |  |
Return on assets 12% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of Target PSUs Earned |  |  | 100.00% |  |
Return on assets 14.4% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of Target PSUs Earned |  |  | 175.00% |  |

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