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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Retirement Plans [Abstract] |  |  |  |  |
Service period of participants not impacted by pension plan amendment |  |  |  | 15 years |
Age of plan participants not impacted by pension plan amendment |  |  |  | 50 years |
Service period of participants who are age fifty not impacted by pension plan amendment |  |  |  | 10 years |
Decrease in pension plan projected benefit obligation |  |  |  | $ (33,433) |
Pension plan defined benefit plan cost increase limit percentage |  |  |  | 4.00% |
Higman [Member] |  |  |  |  |
Retirement Plans [Abstract] |  |  |  |  |
Decrease in pension plan projected benefit obligation |  |  |  | $ (3,692) |
Pension contributions |  | $ 6,717 |  |  |
Expected additional contribution | $ 1,385 |  |  | 1,385 |
Pension Plan [Member] |  |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | 1,722 |  | $ 1,742 | 5,816 | $ 8,934
Interest cost | 3,939 |  | 3,320 | 11,544 | 10,409
Expected return on plan assets | (5,696) |  | (4,595) | (16,712) | (13,600)
Amortization of actuarial loss | 723 |  | 981 | 2,168 | 3,419
Net periodic benefit cost | 688 |  | 1,448 | 2,816 | 9,162
SERP [Member] |  |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | 0 |  | 0 | 0 | 0
Interest cost | 12 |  | 14 | 36 | 43
Expected return on plan assets | 0 |  | 0 | 0 | 0
Amortization of actuarial loss | 6 |  | 7 | 18 | 21
Net periodic benefit cost | 18 |  | 21 | 54 | 64
Other Postretirement Benefits [Member] |  |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | 0 |  | 0 | 0 | 0
Interest cost | 6 |  | 6 | 18 | 20
Amortization of actuarial loss | (149) |  | (166) | (447) | (501)
Net periodic benefit cost | $ (143) |  | $ (160) | $ (429) | $ (481)

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- Definition The service period of eligible participants of the employee pension plan who have reached the age of fifty that will be grandfathered and not be impacted by the amendment to the pension plan. + References No definition available. + Details
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- Definition The service period of eligible participants of the employee pension plan who will be grandfathered and not be impacted by the amendment to the pension plan. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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