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Amount of cash inflow from exercise of option under share-based payment arrangement.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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STOCK-BASED INCENTIVE COMPENSATION (Details) - USD ($)	12 Months Ended
STOCK-BASED INCENTIVE COMPENSATION (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 03, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Weighted-average grant-date fair value per share (in dollars per share)	$ 1.13
Proceeds from stock option exercises	$ 400,000	$ 0	$ 0
Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based compensation expense	$ 400,000	$ 400,000
Weighted-average grant-date fair value per share (in dollars per share)	$ 5.94
Options granted in period (in shares)	204,928	0	0
Value of shares surrendered to satisfy tax withholding obligations	$ 2,700,000	$ 400,000
Unrecognized compensation expense	$ 1,000,000.0
Weighted average period of recognition	1 year 9 months 18 days
Restricted Stock
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based compensation expense	$ 2,300,000	1,900,000
Value of shares surrendered to satisfy tax withholding obligations	300,000	2,100,000
Unrecognized compensation expense	$ 6,000,000.0
Weighted average period of recognition	1 year 8 months 12 days
Value of shares vested in period	$ 1,500,000	1,900,000	$ 0
HC I Incentive Units
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based compensation expense	$ 200,000	1,900,000	$ 2,100,000
The 2018 Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares authorized (in shares)				4,101,735
Treasury Stock \| Restricted Stock
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Value of shares surrendered to satisfy tax withholding obligations		$ 2,000,000.0
Minimum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable range of years	7 years
Minimum \| Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting period	3 years
Minimum \| Restricted Stock
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting period	1 year
Maximum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable range of years	10 years
Maximum \| Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting period	4 years
Maximum \| Restricted Stock
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting period	4 years
Director \| Restricted Stock
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Vesting period	1 year