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OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Pension and postretirement benefits [Abstract] |  |  |  |  |
Amortization of net actuarial loss, Gross Amount | [1] | $ 580 | $ 822 | $ 1,739 | $ 2,939
Amortization of net actuarial loss, Income Tax (Provision) Benefit | [1] | (142) | (315) | (423) | (1,125)
Amortization of net actuarial loss, Net Amount | [1] | 438 | 507 | 1,316 | 1,814
Actuarial gains (losses), Gross Amount | [1] |  |  | (609) | 22,014
Actuarial gains (losses), Income Tax (Provision) Benefit | [1] |  |  | 148 | (8,435)
Actuarial gains (losses), Net Amount | [1] |  |  | (461) | 13,579
Foreign currency translation, Gross Amount |  | (60) | (164) | (69) | (164)
Foreign currency translation, Income Tax (Provision) Benefit |  | 0 | 0 | 0 | 0
Foreign currency translation, Net Amount |  | (60) | (164) | (69) | (164)
Total other comprehensive income (loss), Gross Amount |  | 520 | 658 | 1,061 | 24,789
Total other comprehensive income (loss), Income Tax (Provision) Benefit |  | (142) | (315) | (8,200) | (9,560)
Total other comprehensive income (loss), net of taxes |  | $ 378 | $ 343 | (7,139) | 15,229
ASU 2018-02 [Member] |  |  |  |  |
Pension and postretirement benefits [Abstract] |  |  |  |  |
Adoption of ASU 2018-02 - reclassification to retained earnings, Gross Amount |  |  |  | 0 | 0
Adoption of ASU 2018-02 - reclassification to retained earnings, Income Tax (Provision) Benefit |  |  |  | (7,925) | 0
Adoption of ASU 2018-02 - reclassification to retained earnings, Net Amount |  |  |  | $ (7,925) | $ 0
[1] | Actuarial gains/(losses) are amortized into other income (expense). (See Note 13 - Retirement Plans)

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