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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Notes)
 6 Months Ended
Jun. 30, 2019
Defined Benefit Plan [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS

The following tables set forth the components of net periodic benefit cost (income) for our retirement and other postretirement benefit plans for the periods indicated:
 
Retirement Benefits
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
 
(Thousands of dollars)
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
1,954

 
$
1,832

 
$
3,908

 
$
3,664

Interest cost
5,126

 
4,408

 
10,252

 
8,816

Expected return on plan assets
(5,892
)
 
(5,969
)
 
(11,784
)
 
(11,938
)
Amortization of net loss
3,158

 
4,258

 
6,316

 
8,516

Net periodic benefit cost
$
4,346

 
$
4,529

 
$
8,692

 
$
9,058


 
Other Postretirement Benefits
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
 
(Thousands of dollars)
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
117

 
$
211

 
$
234

 
$
422

Interest cost
509

 
527

 
1,018

 
1,054

Expected return on plan assets
(570
)
 
(672
)
 
(1,140
)
 
(1,344
)
Amortization of prior service credit
(57
)
 
(415
)
 
(114
)
 
(830
)
Amortization of net loss
74

 
334

 
148

 
668

Net periodic benefit cost (income)
$
73

 
$
(15
)
 
$
146

 
$
(30
)