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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2018
Employee Benefit Plans [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
The following tables set forth the components of net periodic benefit cost for our pension and other postemployment benefit plans for the periods indicated:
 
Pension Benefits
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
2017
 
2018
2017
 
(Thousands of dollars)
Components of net periodic benefit cost
 
 
 
 
 
Service cost
$
3,230

$
3,044

 
$
6,460

$
6,088

Interest cost (a)
9,200

10,113

 
18,400

20,226

Expected return on assets (a)
(15,145
)
(14,624
)
 
(30,290
)
(29,248
)
Amortization of net loss (a)
9,978

9,027

 
19,956

18,054

Net periodic benefit cost
$
7,263

$
7,560

 
$
14,526

$
15,120

(a) Upon adoption of ASU 2017-07 on January 1, 2018, these amounts are recognized as other income (expense) in the Consolidated Statements of Income. See Note 11 for additional detail of our other income (expense).

 
Other Postemployment Benefits
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
2017
 
2018
2017
 
(Thousands of dollars)
Components of net periodic benefit (credit) cost
 
 
 
 
 
Service cost
$
589

$
627

 
$
1,178

$
1,254

Interest cost (a)
2,279

2,472

 
4,558

4,944

Expected return on assets (a)
(3,571
)
(3,147
)
 
(7,142
)
(6,294
)
Amortization of unrecognized prior service cost (a)
(1,142
)
(1,149
)
 
(2,284
)
(2,298
)
Amortization of net loss (a)
972

1,621

 
1,944

3,242

Net periodic benefit (credit) cost
$
(873
)
$
424

 
$
(1,746
)
$
848


(a) Upon adoption of ASU 2017-07 on January 1, 2018, these amounts are recognized as other income (expense) in the Consolidated Statements of Income. See Note 11 for additional detail of our other income (expense).