COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Estimated future operating lease expense
2017	$ 2,401
2018	2,271
2019	1,568
2020	1,143
2021	942
Thereafter	2,092
Total	10,417
Rental expense
Rental expense	$ 2,720	$ 1,946	$ 1,976
Severance Benefit Agreements
Rental expense
Period of specified benefits to key employees Upon the subsequent severance of employment	24 months