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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost to be recognized for option under share-based payment arrangement.

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