INCOME TAXES - NOL (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net operating losses
Total net operating losses	$ 2,000	$ 2,100	$ 4,200
Annual NOL carryforward available for use	71,000
Federal
Net operating losses
Total net operating losses	900	1,000
NOL write-down	48,500
Foreign
Net operating losses
Total net operating losses	200	100
State
Net operating losses
Total net operating losses	900	$ 1,000
NOL write-down	$ 17,500