SHARE-BASED COMPENSATION PLANS - ESPP Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 853	$ 1,606	$ 2,577	$ 4,493
Remaining share-based compensation expense			2,577	4,493
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deductions from employees			0	116
Share-based compensation expense recognized			0	70
Remaining share-based compensation expense			$ 0	$ 113