EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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	$ 1,971	$ 1,779	$ 1,525