INCOME TAXES - Uncertain Tax Position (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 1,158	$ 0	$ 80
Gross increases in tax positions in current period	2	0	0
Gross increase in tax positions in prior period	37	32	291
Gross decrease in tax positions in prior period	(1)	(1)	(160)
Gross increase in tax positions from acquisitions	16	1,162	0
Settlement	0	0	(211)
Lapse of statute of limitations	(51)	(35)	0
Ending balance	$ 1,161	$ 1,158	$ 0