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Employee and Retiree Benefit Plans (Tables)
 6 Months Ended
Jun. 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-month and six-month periods ended June 30, 2019 and 2018.

Three Months Ended June 30,

Pension Benefits
 
Other Postretirement Benefits
(Thousands of dollars)
2019
 
2018
 
2019
 
2018
Service cost
$
2,062

 
2,254

 
420

 
493

Interest cost
7,100

 
6,707

 
943

 
874

Expected return on plan assets
(6,370
)
 
(7,453
)
 
—

 
—

Amortization of prior service cost (credit)
246

 
256

 
(97
)
 
(9
)
Recognized actuarial loss
3,508

 
5,181

 
—

 
—

Net periodic benefit expense
$
6,546

 
6,945

 
1,266

 
1,358


 
Six Months Ended June 30,
 
Pension Benefits
 
Other Postretirement Benefits
(Thousands of dollars)
2019
 
2018
 
2019
 
2018
Service cost
$
4,124

 
4,509

 
840

 
987

Interest cost
14,251

 
13,444

 
1,888

 
1,748

Expected return on plan assets
(12,830
)
 
(14,959
)
 
—

 
—

Amortization of prior service cost (credit)
493

 
513

 
(195
)
 
(19
)
Recognized actuarial loss
7,022

 
10,396

 
—

 
—

Net periodic benefit expense
$
13,060

 
13,903

 
2,533

 
2,716