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Pension Plans and Other Postretirement Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2021
General Discussion Of Pension And Other Postretirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost The following table sets forth the components of net periodic benefit costs for the three months ended March 31 (dollars in thousands):

 

 

Pension Benefits

 

 

Other Postretirement Benefits

 

 

 

2021

 

 

2020

 

 

2021

 

 

2020

 

Service cost

 

$

6,246

 

 

$

5,546

 

 

$

1,008

 

 

$

979

 

Interest cost

 

 

6,580

 

 

 

6,971

 

 

 

1,376

 

 

 

1,515

 

Expected return on plan assets

 

 

(9,775

)

 

 

(9,125

)

 

 

(675

)

 

 

(630

)

Amortization of prior service cost

 

 

75

 

 

 

75

 

 

 

(275

)

 

 

(275

)

Net loss recognition

 

 

1,823

 

 

 

1,654

 

 

 

1,173

 

 

 

1,243

 

Net periodic benefit cost

 

$

4,949

 

 

$

5,121

 

 

$

2,607

 

 

$

2,832