RESTRUCTURING (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2013 employee	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Restructuring and Related Activities [Abstract]
Number of positions eliminated | employee	100
Restructuring cost		$ 6,300
Restructuring charges		$ 0	$ 0	$ 4,490