INCOME TAXES - Reconciliation of income tax (expense) benefit (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income tax benefit (expense) - excluding excess tax benefit on stock compensation and CARES Act	$ 831	$ 3,127	$ (7,839)	$ (970)
Excess tax benefit on stock compensation	8,261	753	8,293	1,807
Income tax benefit from CARES Act	0	0	0	6,104
Income tax benefit	$ 9,092	$ 3,880	$ 454	$ 6,941