INCOME TAXES (Uncertain tax positions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
Balance at beginning	$ 1,863	$ 2,550
Net decreases for tax positions of prior years		(841)
Net (decreases) increases due to tax positions that only affect timing	$ (1,863)	154
Balance at ending		$ 1,863