STOCK-BASED COMPENSATION - Restricted Stock (Details) - 2017 Omnibus Incentive Plan - Restricted Stock Units (RSUs) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Number of Units
Non-vested at the beginning (in units)	841,361	763,591
Granted (in units)	753,986	592,015
Vested (in units)	(187,956)	(128,130)
Forfeited (in units)	(226,509)	(386,115)
Non-vested at the end (in units)	1,180,882	841,361
Weighted Average Grant Date Fair Value (Per Unit)
Outstanding at the beginning (per unit)	$ 10.44	$ 9.98
Granted (per unit)	2.45	11.57
Vested (per unit)	10.35	9.86
Forfeited (per unit)	10.16	11.43
Outstanding at the end (per unit)	$ 5.44	$ 10.44
Director Group
Number of Units
Granted (in units)	785,498
Non-vested at the end (in units)	730,838

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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