INCOME TAXES - (Summary of Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal:
Current	$ (29,449)	$ (982)	$ 5,162
Deferred	(3,494)	567	(751)
Federal income tax expense (benefit)	(32,943)	(415)	4,411
State:
Current	(403)	241	1,383
Deferred	(150)	(124)	(296)
State income tax expense (benefit)	(553)	117	1,087
Total income tax expense (benefit)	$ (33,496)	$ (298)	$ 5,498