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Other Post-

(in thousands)

Pension Benefits

Retirement Benefits

For the Three Months Ended September 30,

2022

2021

2022

2021

Service cost

$

2,855

$

2,620

$

25

$

23

Interest cost

3,756

3,552

77

91

Expected return on plan assets

(11,714

)

(11,463

)

—

—

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

450

717

(139

)

(192

)

Net periodic benefit cost

$

(4,653

)

$

(4,574

)

$

(37

)

$

(78

)

(in thousands)

Pension Benefits

Retirement Benefits

For the Nine Months Ended September 30,

2022

2021

2022

2021

Service cost

$

8,584

$

8,996

$

75

$

71

Interest cost

10,881

9,982

230

257

Expected return on plan assets

(34,900

)

(34,854

)

—

—

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

2,380

4,471

(417

)

(501

)

Special termination benefits

—

16,052

—

4,137

Net periodic benefit cost (benefit)

$

(13,055

)

$

4,647

$

(112

)

$

3,964