INCOME TAXES - Income Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
US federal income tax expense (benefit):
Current	$ (69)	$ 0	$ 0
Deferred	996	(3,072)	(2,688)
Federal income tax expense (benefit)	927	(3,072)	(2,688)
State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current	1,707	2,074	1,176
Deferred	199	(1,276)	(1,141)
State income tax expense (benefit)	1,906	798	35
Total income tax expense (benefit)	$ 2,833	$ (2,274)	$ (2,653)