EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
EMPLOYEE BENEFIT PLANS
Minimum age required to be eligible to participate in the 401(k) plan			21 years
Expenses accrued relating to employer matching contributions	$ 491	$ 462	$ 1,497	$ 1,436