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Employee and Retiree Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Expense
The table that follows provides the components of net periodic benefit expense for the three and nine-month periods ended September 30, 2019 and 2018.

Three Months Ended September 30,

Pension Benefits
 
Other Postretirement Benefits
(Thousands of dollars)
2019
 
2018
 
2019
 
2018
Service cost
$
2,064

 
2,252

 
421

 
492

Interest cost
7,151

 
6,716

 
945

 
874

Expected return on plan assets
(6,455
)
 
(7,476
)
 
—

 
—

Amortization of prior service cost (credit)
248

 
254

 
(98
)
 
(10
)
Recognized actuarial loss
3,516

 
5,197

 
—

 
—

Net periodic benefit expense
$
6,524

 
6,943

 
1,268

 
1,356


 
Nine Months Ended September 30,
 
Pension Benefits
 
Other Postretirement Benefits
(Thousands of dollars)
2019
 
2018
 
2019
 
2018
Service cost
$
6,188

 
6,761

 
1,261

 
1,479

Interest cost
21,402

 
20,160

 
2,833

 
2,622

Expected return on plan assets
(19,285
)
 
(22,435
)
 
—

 
—

Amortization of prior service cost (credit)
741

 
767

 
(293
)
 
(29
)
Recognized actuarial loss
10,538

 
15,593

 
—

 
—

Net periodic benefit expense
$
19,584

 
20,846

 
3,801

 
4,072