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EQUITY-BASED COMPENSATION - Performance share units (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of times shares issued for each performance share settlement | $ / shares | 1 |  |
Grant date fair value of PSUs | $ 4,400,000 | $ 7,000,000.0 | $ 5,900,000
Compensation expense | (1,700,000) | $ 2,100,000 | $ 500,000
Unrecognized compensation expense | $ 2,200,000 |  |
Weighted-average remaining life | 2 years |  |
Performance share units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of times shares issued for each performance share settlement | 0 |  |
Percentage of Target PSUs Earned | 0.00% |  |
Percentage of Target Amount Earned | 0.00% |  |
Performance share units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of times shares issued for each performance share settlement | 1.75 |  |
Percentage of Target PSUs Earned | 1.75% |  |
Return on assets Less than 9.6% | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target PSUs Earned | 0.00% |  |
Return on assets 9.6% | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target PSUs Earned | 50.00% |  |
Return on assets 12% | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target PSUs Earned | 100.00% |  |
Return on assets 14.4% | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target PSUs Earned | 175.00% |  |
Peer Group Outside of Top 10 | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target Amount Earned | 0.00% |  |
Peer Group Top 10 | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target Amount Earned | 50.00% |  |
Peer Group Top 7 | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target Amount Earned | 100.00% |  |
Peer Group Top 3 | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target Amount Earned | 175.00% |  |
Adjusted FCF Performance Percentage Less than 70% | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target Amount Earned | 0.00% |  |
Adjusted FCF Performance Percentage 70% | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target Amount Earned | 50.00% |  |
Adjusted FCF Performance Percentage 100% | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target Amount Earned | 100.00% |  |
Adjusted FCF Performance Percentage 130% | Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target Amount Earned | 175.00% |  |
Return On Assets Five Percent [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Target Amount Earned | 5.00% |  |

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