PENSION AND POST RETIREMENT BENEFIT PLANS - Net Periodic Benefit (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] | ||
| Interest and service cost | $ 1,995 | $ 2,138 |
| Expected return on plan assets | (3,443) | (3,342) |
| Amortization of net loss | 826 | 830 |
| Net periodic benefit | $ (622) | $ (374) |
| X | ||||||||||
- Definition Defined Benefit Plan Interest and Service Cost No definition available.
|
| X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|