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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Benefits Cost

The following tables show the components of net periodic benefit cost included in expense for the periods indicated.



 

Three Months Ended March 31,

 

 

 

Pension Benefits

 

 

Other Post-Retirement Benefits

 

(in thousands)

 

2024

 

 

2023

 

 

2024

 

 

2023

 

Service cost

 

$

1,979

 

 

$

1,980

 

 

$

9

 

 

$

(31

)

Interest cost

 

 

5,920

 

 

 

5,788

 

 

 

154

 

 

 

216

 

Expected return on plan assets

 

 

(11,917

)

 

 

(11,178

)

 

 

—

 

 

 

—

 

Amortization of net (gain) or loss and prior service costs

 

 

1,204

 

 

 

1,770

 

 

 

(185

)

 

 

(251

)

Net periodic benefit cost

 

$

(2,814

)

 

$

(1,640

)

 

$

(22

)

 

$

(66

)