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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plans and Other Postemployment Benefit Plans Table Text Block [Line Items] |  |
Schedule of Assumptions Used [Table Text Block] | Actuarial Assumptions - The following table sets forth the weighted-average assumptions used to determine benefit obligations for pension and postemployment benefits for the periods indicated:
|  | December 31,
|  | 2018 |  | 2017
Discount rate - pension plans |  | 4.40% |  | 3.80%
Discount rate - other postemployment plans |  | 4.40% |  | 3.70%
Compensation increase rate |  | 3.20% - 4.00% |  | 3.25% - 3.35%
The following table sets forth the weighted-average assumptions used by us to determine the periodic benefit costs for the periods indicated:
|  | Years Ended December 31, |
|  | 2018 |  | 2017 |  |  | 2016 |
Discount rate - pension plans |  | 3.80% |  | 4.30% |  |  | 4.75% |
Discount rate - other postemployment plans |  | 3.70% |  | 4.20% |  |  | 4.75%/3.75% | (a)
Expected long-term return on plan assets - pension plans |  | 7.25% |  | 7.75% |  |  | 7.75% |
Expected long-term return on plan assets - other postemployment plans |  | 7.60% |  | 7.60% |  |  | 8.00%/7.75% | (b)
Compensation increase rate |  | 3.25% - 3.35% |  | 3.25% - 3.40% |  |  | 3.35% - 3.40% |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The following table sets forth our defined benefit pension and other postemployment benefit plans, benefit obligations and fair value of plan assets for the periods indicated:
| Pension Benefits |  | Other Postemployment Benefits
| December 31, |  | December 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Changes in Benefit Obligation | (Thousands of dollars) |  |
Benefit obligation, beginning of period | $ | 993,891 |  |  | $ | 966,531 |  |  | $ | 255,040 |  |  | $ | 243,548 |
Service cost | 12,919 |  |  | 12,176 |  |  | 2,354 |  |  | 2,509 |
Interest cost | 36,801 |  |  | 40,453 |  |  | 9,117 |  |  | 9,890 |
Plan participants’ contributions | — |  |  | — |  |  | 3,563 |  |  | 3,483 |
Actuarial loss (gain) | (42,540 | ) |  | 76,325 |  |  | (31,607 | ) |  | 12,129 |
Benefits paid | (50,561 | ) |  | (55,107 | ) |  | (18,323 | ) |  | (16,690 | )
Plan amendment | — |  |  | — |  |  | — |  |  | 171 |
Settlements | — |  |  | (46,487 | ) |  | — |  |  | — |
Benefit obligation, end of period | 950,510 |  |  | 993,891 |  |  | 220,144 |  |  | 255,040 |
Change in Plan Assets |  |  |  |  |  |  |
Fair value of plan assets, beginning of period | 884,804 |  |  | 739,586 |  |  | 190,226 |  |  | 166,046 |
Actual return (loss) on plan assets | (62,752 | ) |  | 135,056 |  |  | (6,325 | ) |  | 31,228 |
Employer contributions | 42,386 |  |  | 111,936 |  |  | 7,718 |  |  | 6,159 |
Plan participants’ contributions | — |  |  | — |  |  | 3,563 |  |  | 3,483 |
Benefits paid | (50,561 | ) |  | (55,107 | ) |  | (18,323 | ) |  | (16,690 | )
Settlements | 235 |  |  | (46,667 | ) |  | — |  |  | — |
Fair value of assets, end of period | 814,112 |  |  | 884,804 |  |  | 176,859 |  |  | 190,226 |
Balance at December 31 | $ | (136,398 | ) |  | $ | (109,087 | ) |  | $ | (43,285 | ) |  | $ | (64,814 | )
Current liabilities | $ | (962 | ) |  | $ | (963 | ) |  | $ | — |  |  | $ | — |
Noncurrent liabilities | (135,436 | ) |  | (108,124 | ) |  | (43,285 | ) |  | (64,814 | )
Balance at December 31 | $ | (136,398 | ) |  | $ | (109,087 | ) |  | $ | (43,285 | ) |  | $ | (64,814 | )
Schedule of Net Benefit Costs [Table Text Block] | Components of Net Periodic Benefit Cost - The following tables set forth the components of net periodic benefit cost, prior to regulatory deferrals, for our defined benefit pension and other postemployment benefit plans for the period indicated:
| Pension Benefits
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (Thousands of dollars)
Components of net periodic benefit cost |  |  |  |  |
Service cost | $ | 12,919 |  |  | $ | 12,176 |  |  | $ | 12,055 |
Interest cost (a) | 36,801 |  |  | 40,453 |  |  | 45,550 |
Expected return on assets (a) | (60,579 | ) |  | (58,496 | ) |  | (61,183 | )
Amortization of net loss (a) | 39,913 |  |  | 36,107 |  |  | 35,543 |
Net periodic benefit cost | $ | 29,054 |  |  | $ | 30,240 |  |  | $ | 31,965 |
(a) These amounts, net of any amounts capitalized as a regulatory asset since adoption of ASU 2017-07 on January 1, 2018, have been recognized as other income (expense), net in the Consolidated Statements of Income. See Note 14 for additional detail of our other income (expense), net.
| Other Postemployment Benefits
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (Thousands of dollars)
Components of net periodic benefit cost |  |  |  |  |
Service cost | $ | 2,354 |  |  | $ | 2,509 |  |  | $ | 2,675 |
Interest cost (a) | 9,117 |  |  | 9,890 |  |  | 10,235 |
Expected return on assets (a) | (14,284 | ) |  | (12,590 | ) |  | (12,370 | )
Amortization of unrecognized prior service cost (a) | (4,567 | ) |  | (4,597 | ) |  | (3,316 | )
Amortization of net loss (a) | 3,887 |  |  | 6,484 |  |  | 5,369 |
Net periodic benefit cost (credit) | $ | (3,493 | ) |  | $ | 1,696 |  |  | $ | 2,593 |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | Other Comprehensive Income (Loss) - The following table sets forth the amounts recognized in other comprehensive income (loss), net of regulatory deferrals, related to our defined benefit pension benefits for the period indicated:
| Pension Benefits
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (Thousands of dollars)
Net gain (loss) arising during the period | $ | 1,173 |  |  | $ | (2,101 | ) |  | $ | (1,262 | )
Amortization of loss | 1,082 |  |  | 837 |  |  | 751 |
Deferred income taxes | (848 | ) |  | 486 |  |  | 197 |
Total recognized in other comprehensive income (loss) | $ | 1,407 |  |  | $ | (778 | ) |  | $ | (314 | )
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] | The tables below set forth the amounts in accumulated other comprehensive loss that had not yet been recognized as components of net periodic benefit expense for the periods indicated:
| Pension Benefits
| December 31,
| 2018 |  | 2017
| (Thousands of dollars)
Accumulated loss | $ | (419,238 | ) |  | $ | (378,595 | )
Accumulated other comprehensive loss before regulatory assets | (419,238 | ) |  | (378,595 | )
Regulatory asset for regulated entities | 412,545 |  |  | 369,647 |
Accumulated other comprehensive loss after regulatory assets | (6,693 | ) |  | (8,948 | )
Deferred income taxes | 2,607 |  |  | 3,455 |
Accumulated other comprehensive loss, net of tax | $ | (4,086 | ) |  | $ | (5,493 | )
| Other Postemployment Benefits
| December 31,
| 2018 |  | 2017
| (Thousands of dollars)
Prior service credit (cost) | $ | 875 |  |  | $ | 5,442 |
Accumulated loss | (34,144 | ) |  | (49,030 | )
Accumulated other comprehensive loss before regulatory assets | $ | (33,269 | ) |  | $ | (43,588 | )
Regulatory asset for regulated entities | 33,269 |  |  | 43,588 |
Accumulated other comprehensive loss after regulatory assets | $ | — |  |  | $ | — |
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] | The following table sets forth the amounts recognized in either accumulated comprehensive income (loss) or regulatory assets expected to be recognized as components of net periodic benefit expense in the next fiscal year:
| Pension Benefits |  | Other Postemployment Benefits
Amounts to be recognized in 2019 | (Thousands of dollars)
Prior service credit (cost) | $ | — |  |  | $ | (673 | )
Actuarial net loss | $ | 33,039 |  |  | $ | 2,244 |
Schedule of Health Care Cost Trend Rates [Table Text Block] | Health Care Cost Trend Rates - The following table sets forth the assumed health care cost-trend rates for the periods indicated:
| 2018 |  | 2017
Health care cost-trend rate assumed for next year | 7.00% |  | 7.00%
Rate to which the cost-trend rate is assumed to decline (the ultimate trend rate) | 5.00% |  | 5.00%
Year that the rate reaches the ultimate trend rate | 2024 |  | 2023
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] | Assumed health care cost-trend rates have a significant effect on the amounts reported for our other postemployment benefit plans. A one percentage point change in assumed health care cost-trend rates would have the following effects:
| One Percentage |  | One Percentage
| Point Increase |  | Point Decrease
| (Millions of dollars)
Effect on total of service and interest cost | $ | 0.2 |  |  | $ | (0.2 | )
Effect on other postemployment benefit obligation | $ | 2.3 |  |  | $ | (2.4 | )
Schedule of Allocation of Plan Assets [Table Text Block] |  | Plan Assets - Our investment strategy is to invest plan assets in accordance with sound investment practices that emphasize long-term fundamentals. The goal of this strategy is to maximize investment returns while managing risk in order to meet the plan’s current and projected financial obligations. To achieve this strategy, we have established a liability-driven investment strategy to change the allocations as the plan reaches certain funded status. The plan’s investments include a diverse blend of various domestic and international equities, investment-grade debt securities which mirror the cash flows of our liability, insurance contracts and alternative investments. The current target allocation for the assets of our defined benefit pension plan is as follows:
Investment-grade bonds | 40.0 | %
U.S. large-cap equities | 18.0 | %
Alternative investments | 14.0 | %
Developed foreign large-cap equities | 10.0 | %
Mid-cap equities | 7.0 | %
Emerging markets equities | 6.0 | %
Small-cap equities | 5.0 | %
Total | 100 | %
As part of our risk management for the plans, minimums and maximums have been set for each of the asset classes listed above. All investment managers for the plan are subject to certain restrictions on the securities they purchase and, with the exception of indexing purposes, are prohibited from owning our stock. The current target allocation for the assets of our other postemployment benefits plan is 30 percent fixed income securities and 70 percent equity securities. The following tables set forth our pension benefits and other postemployment benefits plan assets by fair value category as of the measurement date:
| Pension Benefits
| December 31, 2018
Asset Category | Level 1 | Level 2 | Level 3 | Total
| (Thousands of dollars)
Investments: |  |  |  |
Equity securities (a) | $ | 282,668 |  | $ | 35,870 |  | $ | — |  | $ | 318,538 |
Government obligations | — |  | 69,475 |  | — |  | 69,475 |
Corporate obligations (b) | — |  | 240,900 |  | — |  | 240,900 |
Cash and money market funds (c) | 2,419 |  | 71,991 |  | — |  | 74,410 |
Insurance contracts and group annuity contracts | — |  | — |  | 30,445 |  | 30,445 |
Other investments (d) | — |  | 1,139 |  | 79,205 |  | 80,344 |
Total assets | $ | 285,087 |  | $ | 419,375 |  | $ | 109,650 |  | $ | 814,112 |
(a) - This category represents securities of the various market sectors from diverse industries. (b) - This category represents bonds from diverse industries. (c) - This category is primarily money market funds. (d) - This category represents alternative investments such as hedge funds and other financial instruments.
| Pension Benefits
| December 31, 2017
Asset Category | Level 1 | Level 2 | Level 3 | Total
| (Thousands of dollars)
Investments: |  |  |  |
Equity securities (a) | $ | 301,911 |  | $ | 91,014 |  | $ | — |  | $ | 392,925 |
Government obligations | — |  | 74,596 |  | — |  | 74,596 |
Corporate obligations (b) | — |  | 260,907 |  | — |  | 260,907 |
Cash and money market funds (c) | 21,139 |  | 20,787 |  | — |  | 41,926 |
Insurance contracts and group annuity contracts | — |  | — |  | 35,158 |  | 35,158 |
Other investments (d) | — |  | 585 |  | 78,707 |  | 79,292 |
Total assets | $ | 323,050 |  | $ | 447,889 |  | $ | 113,865 |  | $ | 884,804 |
(a) - This category represents securities of the various market sectors from diverse industries. (b) - This category represents bonds from diverse industries. (c) - This category is primarily money market funds. (d) - This category represents alternative investments such as hedge funds and other financial instruments.
| Other Postemployment Benefits
| December 31, 2018
Asset Category | Level 1 | Level 2 | Level 3 | Total
| (Thousands of dollars)
Investments: |  |  |  |
Equity securities (a) | $ | 58,087 |  | $ | 2,382 |  | $ | — |  | $ | 60,469 |
Government obligations | — |  | 74 |  | — |  | 74 |
Corporate obligations (b) | — |  | 25,857 |  | — |  | 25,857 |
Cash and money market funds (c) | 1,249 |  | 300 |  | — |  | 1,549 |
Insurance contracts and group annuity contracts (d) | — |  | 88,910 |  | — |  | 88,910 |
Total assets | $ | 59,336 |  | $ | 117,523 |  | $ | — |  | $ | 176,859 |
(a) - This category represents securities of the various market sectors from diverse industries. (b) - This category represents bonds from diverse industries. (c) - This category is primarily money market funds. (d) - This category includes equity securities and bonds held in a captive insurance product.
| Other Postemployment Benefits
| December 31, 2017
Asset Category | Level 1 | Level 2 | Level 3 | Total
| (Thousands of dollars)
Investments: |  |  |  |
Equity securities (a) | $ | 63,180 |  | $ | 123 |  | $ | — |  | $ | 63,303 |
Government obligations | — |  | 101 |  | — |  | 101 |
Corporate obligations (b) | — |  | 25,905 |  | — |  | 25,905 |
Cash and money market funds (c) | 4,512 |  | 28 |  | — |  | 4,540 |
Insurance contracts and group annuity contracts | — |  | 96,377 |  | — |  | 96,377 |
Total assets | $ | 67,692 |  | $ | 122,534 |  | $ | — |  | $ | 190,226 |
(a) - This category represents securities of the various market sectors from diverse industries. (b) - This category represents bonds from diverse industries. (c) - This category is primarily money market funds.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] | The following table sets forth the reconciliation of Level 3 fair value measurements of our pension plans for the periods indicated:
| Pension Benefits
| Insurance Contracts |  | Other Investments |  | Total
| (Thousands of dollars)
January 1, 2017 | $ | 45,140 |  |  | $ | 57,352 |  |  | $ | 102,492 |
Net realized and unrealized gains (losses) | 2,569 |  |  | 5,055 |  |  | 7,624 |
Purchases | — |  |  | 16,300 |  |  | 16,300 |
Settlements | (12,551 | ) |  | — |  |  | (12,551 | )
December 31, 2017 | $ | 35,158 |  |  | $ | 78,707 |  |  | $ | 113,865 |
Net realized and unrealized gains (losses) | (611 | ) |  | 496 |  |  | (115 | )
Purchases | — |  |  | — |  |  | — |
Sales and settlements | (4,100 | ) |  | — |  |  | (4,100 | )
December 31, 2018 | $ | 30,445 |  |  | $ | 79,205 |  |  | $ | 109,650 |
Schedule of Expected Benefit Payments [Table Text Block] | The following table sets forth the pension benefits and other postemployment benefits payments expected to be paid in 2019-2028:
| Pension Benefits |  | Other Postemployment Benefits
Benefits to be paid in: | (Thousands of dollars)
2019 | $ | 52,368 |  |  | $ | 16,746 |
2020 | $ | 53,332 |  |  | $ | 16,737 |
2021 | $ | 54,245 |  |  | $ | 16,632 |
2022 | $ | 55,474 |  |  | $ | 16,603 |
2023 | $ | 56,477 |  |  | $ | 16,424 |
2024 through 2028 | $ | 295,565 |  |  | $ | 77,769 |

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