INCOME TAXES - Reconciliation of income tax (expense) benefit (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income tax benefit (expense) - excluding excess tax (expense) benefit on stock compensation and CARES Act	$ 939	$ 7,750	$ (6,900)	$ 6,780
Excess tax (expense) benefit on stock compensation	(938)	175	7,355	1,982
Income tax benefit from CARES Act	0	0	0	6,104
Income tax benefit	$ 1	$ 7,925	$ 455	$ 14,866