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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS - RSU (Details) - Restricted stock units $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (in shares) | shares	1,853,007
Granted (in shares) | shares	129,827
Vested (in shares) | shares	(222,244)
Forfeited (in shares) | shares	(125,053)
Ending balance (in shares) | shares	1,635,537
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance (in dollars per share) | $ / shares	$ 31.91
Granted (in dollars per share) | $ / shares	32.87
Vested (in dollars per share) | $ / shares	27.60
Forfeited (in dollars per share) | $ / shares	32.39
Ending balance (in dollars per share) | $ / shares	$ 32.37
Unrecognized compensation costs | $	$ 31.4
Weighted-average period of recognition	11 months 8 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years

X

- Definition

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

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