EMPLOYEE BENEFIT PLANS- Net periodic benefit cost (credit) and related components (Details) - Multiple employer pension plan - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Multiemployer Plans [Line Items] | ||
| Interest cost | $ 63 | $ 66 |
| Expected return on plan assets | (125) | (104) |
| Amortization of net losses | 20 | 23 |
| Net periodic benefit (credit) | $ (42) | $ (15) |