INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Balance, beginning of period	$ 1,707	$ 1,327	$ 912
Additions based on tax related to the current period	455	364	306
Additions for tax positions of prior periods	24	55	339
Reductions for tax positions of prior periods	(72)		(34)
Reductions due to the statute of limitations	(82)	(39)	(196)
Settlements	(91)
Balance, end of period	1,941	1,707	1,327
Amount of unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in future periods	1,700
Amount of interest and penalties
Interest and penalties recorded in the income statement as a component of income tax expense	57	173	42
Interest and penalties accrued on balance sheet	$ 510	$ 514	$ 341