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 |