XML 52 R34.htm IDEA: XBRL DOCUMENT v3.19.1
Pension Plans And Other Postretirement Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2019
Components of Net Periodic Benefit Cost
 
Pension Benefits
 
Other Postretirement Benefits
 
2019
 
2018
 
2019
 
2018
Service cost (a)
$
4,874

 
$
5,450

 
$
772

 
$
804

Interest cost
7,138

 
6,466

 
1,372

 
1,197

Expected return on plan assets
(7,815
)
 
(8,250
)
 
(718
)
 
(500
)
Amortization of prior service cost
75

 
75

 
(275
)
 
(815
)
Net loss recognition
2,415

 
2,088

 
1,246

 
1,655

Net periodic benefit cost
$
6,687

 
$
5,829

 
$
2,397

 
$
2,341


(a)
Total service costs in the table above are recorded to the same accounts as labor expense. Labor and benefits expense is recorded to various projects based on whether the work is a capital project or an operating expense. Approximately 40 percent of all labor and benefits is capitalized to utility property and 60 percent is expensed to utility other operating expenses.