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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Table) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock |
Asset Category |  | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Cash and cash equivalents |  | $ | 23,979 |  |  | $ | 4,893 |  |  | $ | 19,086 |  |  | $ | — |
Equity securities- Mutual funds (1) |  | 459,002 |  |  | 418,390 |  |  | 40,612 |  |  | — |
Bond funds (2) |  | 219,249 |  |  | 155,120 |  |  | 64,129 |  |  | — |
Insurance Contracts (3) |  | 10,760 |  |  | — |  |  | — |  |  | 10,760 |
Other (4) |  | 1,618 |  |  | — |  |  | — |  |  | 1,618 |
December 31, 2016 |  | $ | 714,608 |  |  | $ | 578,403 |  |  | $ | 123,827 |  |  | $ | 12,378 |
Cash and cash equivalents |  | $ | 42,374 |  |  | $ | 12,551 |  |  | $ | 29,823 |  |  | $ | — |
Equity securities- Mutual funds (1) |  | 504,633 |  |  | 455,175 |  |  | 49,458 |  |  | — |
Bond funds (2) |  | 216,372 |  |  | 150,265 |  |  | 66,107 |  |  | — |
Insurance Contracts (3) |  | 10,912 |  |  | — |  |  | — |  |  | 10,912 |
Other (4) |  | 2,191 |  |  | — |  |  | — |  |  | 2,191 |
December 31, 2017 |  | $ | 776,482 |  |  | $ | 617,991 |  |  | $ | 145,388 |  |  | $ | 13,103 |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Pension Benefits |  | Postretirement Benefits
(In thousands) |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Service cost |  | $ | 25,093 |  |  | $ | 25,100 |  |  | $ | 26,873 |  |  | $ | 435 |  |  | $ | 338 |  |  | $ | 286 |
Interest cost |  | 25,895 |  |  | 30,495 |  |  | 30,050 |  |  | 762 |  |  | 996 |  |  | 842 |
Expected return on plan assets |  | (53,552 | ) |  | (54,101 | ) |  | (54,629 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service cost |  | (100 | ) |  | (46 | ) |  | 618 |  |  | (656 | ) |  | (657 | ) |  | (657 | )
Recognized net actuarial loss/(gain) |  | 12,925 |  |  | 12,029 |  |  | 16,890 |  |  | (223 | ) |  | (296 | ) |  | (551 | )
Cost of settlements/curtailments |  | 327 |  |  | — |  |  | 7,461 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (income) |  | $ | 10,588 |  |  | $ | 13,477 |  |  | $ | 27,263 |  |  | $ | 318 |  |  | $ | 381 |  |  | $ | (80 | )
ScheduleOfChangesInProjectedBenefitObligationsTableTextBlock |
|  | Pension Benefits |  | Postretirement Benefits
(In thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Change in benefit obligation: |  |  |  |  |  |  |  |
Beginning of year |  | $ | 798,605 |  |  | $ | 774,710 |  |  | $ | 24,436 |  |  | $ | 21,980 |
Service cost |  | 25,093 |  |  | 25,100 |  |  | 435 |  |  | 338 |
Interest cost |  | 25,895 |  |  | 30,495 |  |  | 762 |  |  | 996 |
Plan participants’ contributions |  | 1,655 |  |  | 1,897 |  |  | 253 |  |  | 266 |
Amendments |  | — |  |  | — |  |  | — |  |  | — |
Actuarial loss |  | 56,727 |  |  | 19,640 |  |  | 2,056 |  |  | 3,372 |
Benefits paid |  | (45,384 | ) |  | (41,115 | ) |  | (2,907 | ) |  | (2,516 | )
Actual expenses |  | (1,301 | ) |  | (1,206 | ) |  | — |  |  | — |
Currency translation adjustments |  | 7,597 |  |  | (10,916 | ) |  | — |  |  | — |
End of year |  | $ | 868,887 |  |  | $ | 798,605 |  |  | $ | 25,035 |  |  | $ | 24,436 |
Change in plan assets: |  |  |  |  |  |  |  |
Beginning of year |  | $ | 714,608 |  |  | $ | 692,074 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets |  | 94,960 |  |  | 65,872 |  |  | — |  |  | — |
Employer contribution |  | 4,561 |  |  | 8,210 |  |  | 2,654 |  |  | 2,250 |
Plan participants’ contributions |  | 1,655 |  |  | 1,897 |  |  | 253 |  |  | 266 |
Benefits paid |  | (45,384 | ) |  | (41,115 | ) |  | (2,907 | ) |  | (2,516 | )
Actual Expenses |  | (1,301 | ) |  | (1,206 | ) |  | — |  |  | — |
Currency translation adjustments |  | 7,383 |  |  | (11,124 | ) |  | — |  |  | — |
End of year |  | $ | 776,482 |  |  | $ | 714,608 |  |  | $ | — |  |  | $ | — |
Funded status |  | $ | (92,405 | ) |  | $ | (83,997 | ) |  | $ | (25,035 | ) |  | $ | (24,436 | )
|  | Pension Benefits |  | Postretirement Benefits
(In thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Amounts recognized on the balance sheet |  |  |  |  |  |  |  |
Noncurrent assets |  | $ | 8,663 |  |  | $ | 4,049 |  |  | $ | — |  |  | $ | — |
Current liabilities |  | (3,374 | ) |  | (3,498 | ) |  | (1,686 | ) |  | (1,833 | )
Noncurrent liabilities |  | (97,694 | ) |  | (84,548 | ) |  | (23,349 | ) |  | (22,603 | )
Total |  | $ | (92,405 | ) |  | $ | (83,997 | ) |  | $ | (25,035 | ) |  | $ | (24,436 | )
Amounts recognized in accumulated other comprehensive income (AOCI) |  |  |  |  |  |  |  |
Net actuarial loss (gain) |  | $ | 201,390 |  |  | $ | 198,630 |  |  | $ | (2,899 | ) |  | $ | (5,178 | )
Prior service cost |  | (1,461 | ) |  | (1,580 | ) |  | (2,718 | ) |  | (3,373 | )
Total |  | $ | 199,929 |  |  | $ | 197,050 |  |  | $ | (5,617 | ) |  | $ | (8,551 | )
Amounts in AOCI expected to be recognized in net periodic cost in the coming year: |  |  |  |  |  |  |  |
Loss (gain) recognition |  | $ | 15,615 |  |  | $ | 11,793 |  |  | $ | (29 | ) |  | $ | (203 | )
Prior service cost recognition |  | $ | (250 | ) |  | $ | (105 | ) |  | $ | (657 | ) |  | $ | (657 | )
Accumulated benefit obligation |  | $ | 834,745 |  |  | $ | 767,461 |  |  | N/A |  |  | N/A |
Information for pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |  |  |
Projected benefit obligation |  | $ | 785,039 |  |  | $ | 733,426 |  |  | N/A |  |  | N/A |
Accumulated benefit obligation |  | 752,371 |  |  | 702,282 |  |  | N/A |  |  | N/A |
Fair value of plan assets |  | 684,756 |  |  | 645,380 |  |  | N/A |  |  | N/A |
ScheduleOfAssumptionsUsedTableTextBlock |
|  | Pension Benefits |  | Postretirement Benefits
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Weighted-average assumptions in determination of benefit obligation: |  |  |  |  |  |  |  |
Discount rate |  | 3.46 | % |  | 3.88 | % |  | 3.54 | % |  | 4.00 | %
Rate of compensation increase |  | 3.55 | % |  | 3.35 | % |  | N/A |  |  | N/A |
Health care cost trends: |  |  |  |  |  |  |  |
Rate assumed for subsequent year |  | N/A |  |  | N/A |  |  | 8.30 | % |  | 8.25 | %
Ultimate rate reached in 2026 |  | N/A |  |  | N/A |  |  | 4.50 | % |  | 4.50 | %
Weighted-average assumptions in determination of net periodic benefit cost: |  |  |  |  |  |  |  |
Discount rate |  | 3.93 | % |  | 4.12 | % |  | 4.02 | % |  | 4.25 | %
Expected return on plan assets |  | 7.47 | % |  | 7.81 | % |  | N/A |  |  | N/A |
Rate of compensation increase |  | 3.54 | % |  | 3.35 | % |  | N/A |  |  | N/A |
Health care cost trends: |  |  |  |  |  |  |  |
Rate assumed for subsequent year |  | N/A |  |  | N/A |  |  | 8.25 | % |  | 8.75 | %
Ultimate rate reached in 2026 |  | N/A |  |  | N/A |  |  | 4.50 | % |  | 4.50 | %
ScheduleOfEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesTableTextBlock |
(In thousands) |  | 1% Increase |  |  | 1% Decrease |
Total service and interest cost components |  | $ | 28 |  |  | $ | (23 | )
Postretirement benefit obligation |  | $ | 502 |  |  | $ | (414 | )
ScheduleOfAllocationOfPlanAssetsTableTextBlock |
|  | As of December 31, |  | Target |  | Expected
|  | 2017 |  | 2016 |  | Exposure |  | Range
Asset class |  |  |  |  |  |  |  |
Domestic equities |  | 52% |  | 54% |  | 50% |  | 40%-60%
International equities |  | 15% |  | 13% |  | 15% |  | 10%-20%
Total equity |  | 67% |  | 67% |  | 65% |  | 55%-75%
Fixed income |  | 33% |  | 33% |  | 35% |  | 25%-45%
ScheduleOfExpectedBenefitPaymentsTableTextBlock |
(In thousands) |  | Pension Plans |  | Postretirement Plans |  | Total
2018 |  | $ | 45,604 |  |  | $ | 1,686 |  |  | $ | 47,290 |
2019 |  | 48,937 |  |  | 1,693 |  |  | 50,630 |
2020 |  | 49,859 |  |  | 1,694 |  |  | 51,553 |
2021 |  | 51,058 |  |  | 1,689 |  |  | 52,747 |
2022 |  | 50,361 |  |  | 1,678 |  |  | 52,039 |
2023 — 2027 |  | 266,582 |  |  | 8,030 |  |  | 274,612 |
Level 3 |
Defined Benefit Plan Disclosure [Line Items] |
ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock |
(In thousands) |  | Insurance Contracts |  | Other |  | Total
December 31, 2015 |  | $ | 9,720 |  |  | $ | 755 |  |  | $ | 10,475 |
Actual return on plan assets: |  |  |  |  |  |
Relating to assets still held at the reporting date |  | 148 |  |  | 35 |  |  | 183 |
Purchases, sales, and settlements |  | 1,095 |  |  | 871 |  |  | 1,966 |
Foreign currency translation adjustment |  | (203 | ) |  | (43 | ) |  | (246 | )
December 31, 2016 |  | $ | 10,760 |  |  | $ | 1,618 |  |  | $ | 12,378 |
Actual return on plan assets: |  |  |  |  |  |
Relating to assets still held at the reporting date |  | 167 |  |  | 58 |  |  | 226 |
Purchases, sales, and settlements |  | (503 | ) |  | 436 |  |  | (68 | )
Foreign currency translation adjustment |  | 488 |  |  | 79 |  |  | 567 |
December 31, 2017 |  | $ | 10,912 |  |  | $ | 2,191 |  |  | $ | 13,103 |

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