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EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
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