PROPERTY, PLANT AND EQUIPMENT Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Property, Plant and Equipment [Abstract]
Depreciation	$ 1,100	$ 900	$ 2,300	$ 1,800
Spinal hardware instrument replacement expense	$ 200	$ 300	$ 760	$ 496