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Benefit Plans
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Benefit Plans BENEFIT PLANS
 
The following table presents the net periodic benefit cost of the Pension Plans combined:
 Three Months EndedNine Months Ended
 September 30,September 30,
 2024202320242023
 (In Thousands)
Components of net periodic benefit cost:
    
Service cost$1,253 $1,297 $3,759 $3,892 
Interest cost6,739 7,455 20,217 22,365 
Expected return on plan assets(7,443)(8,277)(22,329)(24,830)
Amortization of prior service cost475 543 1,425 1,629 
Amortization of actuarial loss1,207 1,536 3,621 4,608 
Net periodic benefit cost
$2,231 $2,554 $6,693 $7,664 

The components of net periodic benefit cost other than service cost are included in “Other (expense) / income, net” in the Condensed Consolidated Statements of Operations.

In addition, AES Indiana provides postretirement health care benefits to certain active or retired employees and the spouses of certain active or retired employees. These postretirement health care benefits and the related unfunded obligation were not material to the Financial Statements in the periods covered by this report.