EMPLOYEE BENEFITS (Employee benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Discretionary matching contribution to retirement plan by employer (as a percent)	2.00%
Vesting period	2 years
Contribution by employer for retirement plan	$ 1,934	$ 740	$ 549