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Pension and Other Postretirement Employee Benefits
 9 Months Ended
Sep. 30, 2024
Retirement Benefits, Description [Abstract]  
Pension and Other Postretirement Employee Benefits

NOTE 11. PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS

The following table details the components of net periodic cost (benefit) of our pension plans and other postretirement employee benefit plans (OPEB):

 

 

 

Three Months Ended September 30,

 

 

 

Pension

 

 

OPEB

 

(in thousands)

 

2024

 

 

2023

 

 

2024

 

 

2023

 

Service cost

 

$

1,321

 

 

$

1,355

 

 

$

22

 

 

$

27

 

Interest cost

 

 

3,124

 

 

 

3,139

 

 

 

220

 

 

 

294

 

Expected return on plan assets

 

 

(3,237

)

 

 

(3,028

)

 

 

—

 

 

 

—

 

Amortization of prior service cost

 

 

5

 

 

 

10

 

 

 

—

 

 

 

—

 

Amortization of actuarial (gain) loss

 

 

19

 

 

 

(21

)

 

 

(331

)

 

 

(166

)

Total net periodic cost

 

$

1,232

 

 

$

1,455

 

 

$

(89

)

 

$

155

 

 

 

 

 

 

Nine Months Ended September 30,

 

 

 

Pension

 

 

OPEB

 

(in thousands)

 

2024

 

 

2023

 

 

2024

 

 

2023

 

Service cost

 

$

3,964

 

 

$

4,066

 

 

$

69

 

 

$

82

 

Interest cost

 

 

9,369

 

 

 

9,414

 

 

 

658

 

 

 

881

 

Expected return on plan assets

 

 

(9,711

)

 

 

(9,081

)

 

 

—

 

 

 

—

 

Amortization of prior service cost

 

 

15

 

 

 

32

 

 

 

—

 

 

 

—

 

Amortization of actuarial (gain) loss

 

 

59

 

 

 

(63

)

 

 

(992

)

 

 

(498

)

Net periodic cost

 

$

3,696

 

 

$

4,368

 

 

$

(265

)

 

$

465

 

During the nine months ended September 30, 2024 and 2023, funding of non-qualified pension and other postretirement employee benefit plans was $3.3 million and $2.2 million, respectively. During the nine months ended September 30, 2024 and 2023, we made contributions to our qualified pension benefit plan of $4.0 million and $0, respectively.