INCOME TAXES (Summary of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Provision for (benefit from) income taxes
Current	$ 826	$ 1,427	$ (703)
Deferred income taxes	10,827	27,818	16,195
Income tax expense (benefit)	$ 11,653	$ 29,245	$ 15,492