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STOCK-BASED COMPENSATION PLANS - Restricted Stock Awards and Units and Performance-Based Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	4 Months Ended	9 Months Ended
	Apr. 30, 2019	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Weighted Average Grant Date Fair Value
Total grant date fair value of shares that vested during the period			$ 5,551	$ 6,765
RSAs
Shares
Unvested balance at the beginning of the period (in shares)			487,976
Granted (in shares)			0
Vested (in shares)			(304,441)
Forfeited (in shares)			(27,484)
Unvested balance at the end of the period (in shares)		156,051	156,051
Weighted Average Grant Date Fair Value
Unvested balance at the end of the period (in dollars per share)			$ 6.87
Granted (in dollars per share)			0
Vested (in dollars per share)			6.80
Forfeited (in dollars per share)			6.97
Unvested balance at end of the period (in dollars per share)		$ 7.00	$ 7.00
Total grant date fair value of shares that vested during the period			$ 10,000
RSUs
Shares
Unvested balance at the beginning of the period (in shares)			2,790,060
Granted (in shares)			6,486,016
Vested (in shares)			(1,667,289)
Forfeited (in shares)			(677,124)
Unvested balance at the end of the period (in shares)		6,931,663	6,931,663
Weighted Average Grant Date Fair Value
Unvested balance at the end of the period (in dollars per share)			$ 5.11
Granted (in dollars per share)			2.93
Vested (in dollars per share)			4.75
Forfeited (in dollars per share)			3.69
Unvested balance at end of the period (in dollars per share)		$ 3.30	$ 3.30
PSUs
Shares
Unvested balance at the beginning of the period (in shares)			1,067,073
Granted (in shares)	872,073	823,369	5,804,202
Vested (in shares)			(323,752)
Forfeited (in shares)			(377,753)
Unvested balance at the end of the period (in shares)		6,169,770	6,169,770
Weighted Average Grant Date Fair Value
Unvested balance at the end of the period (in dollars per share)			$ 5.94
Granted (in dollars per share)			1.44
Vested (in dollars per share)			5.52
Forfeited (in dollars per share)			5.22
Unvested balance at end of the period (in dollars per share)		$ 1.67	$ 1.67
Total grant date fair value of shares that vested during the period			$ 1,800

X

- Definition

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
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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 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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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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