INCOME TAXES - Income Tax Uncertainties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of period	$ 5,709	$ 4,781	$ 6,637
Increases for tax positions of prior years	431	1,366	393
Decreases for tax positions of prior years	(1,978)	(1,185)	(2,711)
Increases for tax positions related to current year	600	747	462
Balance at end of period	$ 4,762	$ 5,709	$ 4,781