PROPERTY, PLANT AND EQUIPMENT Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
PROPERTY, PLANT AND EQUIPMENT
Depreciation expense	$ 5,000	$ 5,300	$ 4,300
Impairment charges	$ 0	$ 600