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Other Post-

($ in thousands)

Pension Benefits

Retirement Benefits

For the Three Months Ended March 31,

2023

2022

2023

2022

Service cost

$

1,980

$

2,800

$

(31

)

$

25

Interest cost

5,788

3,417

216

77

Expected return on plan assets

(11,178

)

(11,475

)

—

—

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

1,770

1,348

(251

)

(139

)

Net periodic benefit cost

$

(1,640

)

$

(3,910

)

$

(66

)

$

(37

)