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Pension and Other Postretirement Employee Benefits (Tables)
3 Months Ended
Mar. 31, 2025
Retirement Benefits, Description [Abstract]  
Components of Net Periodic Cost (Benefit)

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 March 31,

 

 

 

Pension

 

 

OPEB

 

(in thousands)

 

2025

 

 

2024

 

 

2025

 

 

2024

 

Service cost

 

$

1,266

 

 

$

1,321

 

 

$

14

 

 

$

23

 

Interest cost

 

 

3,228

 

 

 

3,123

 

 

 

252

 

 

 

219

 

Expected return on plan assets

 

 

(2,932

)

 

 

(3,237

)

 

 

 

 

 

 

Amortization of prior service cost

 

 

 

 

 

5

 

 

 

 

 

 

 

Amortization of actuarial (gain) loss

 

 

43

 

 

 

20

 

 

 

(240

)

 

 

(331

)

Total net periodic cost

 

$

1,605

 

 

$

1,232

 

 

$

26

 

 

$

(89

)