INCOME TAXES - NOL rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INCOME TAXES
Net operating losses, beginning balance	$ 2,100	$ 4,200
NOL generated (utilized)	(100)	(2,200)
Other, including changes in foreign exchange rates		100
Net operating losses, end balance	2,000	2,100
Unremitted earnings of non-US subsidiaries	700		$ 0
Unrecognized tax benefits	0	0
Penalties or interest	$ 0	$ 0