INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
INCOME TAXES
Effective income tax rates (as a percent)	6.40%	(75.20%)	4.10%	(51.10%)
Pretax income	$ 2,524	$ (1,228)	$ 2,633	$ (1,791)
Release of accruals for uncertain tax positions due to the expiration of statute limitations in a foreign jurisdiction	700
Unrecognized tax benefits	3,400		3,400
Interest and penalties accrued	$ 1,000		$ 1,000