EQUITY-BASED COMPENSATION - Expenses Related to Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	$ 676	$ 232	$ 1,604	$ 669
Remaining Expense To Be Recognized, If All Vesting Conditions Are Met	4,691		4,691
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	0	0	0	9
Remaining Expense To Be Recognized, If All Vesting Conditions Are Met	0		$ 0
Weighted Average Remaining Contractual Term (in years)			9 years
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	273	89	$ 819	269
Remaining Expense To Be Recognized, If All Vesting Conditions Are Met	1,322		$ 1,322
Weighted Average Remaining Contractual Term (in years)			1 year 1 month 6 days
Common Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	403	$ 143	$ 785	$ 391
Remaining Expense To Be Recognized, If All Vesting Conditions Are Met	$ 3,369		$ 3,369
Weighted Average Remaining Contractual Term (in years)			1 year 3 months 18 days

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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