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EQUITY-BASED COMPENSATION - Performance share units (Details)	12 Months Ended
	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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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