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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Compensation And Retirement Disclosure [Abstract]  
Components of Net Periodic Benefits Cost

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

 



 

 

 

 

 

 

 

 

 

Other Post-

 

(in thousands)

 

Pension Benefits

 

 

Retirement Benefits

 

For The Three Months Ended March 31,

 

2021

 

 

2020

 

 

2021

 

 

2020

 

Service cost

 

$

3,450

 

 

$

3,275

 

 

$

27

 

 

$

22

 

Interest cost

 

 

3,460

 

 

 

3,782

 

 

 

99

 

 

 

164

 

Expected return on plan assets

 

 

(12,058

)

 

 

(11,300

)

 

—

 

 

 

—

 

Amortization of net loss and prior service costs

 

 

2,100

 

 

 

1,461

 

 

 

(146

)

 

 

(229

)

Net reduction of periodic benefit cost

 

$

(3,048

)

 

$

(2,782

)

 

$

(20

)

 

$

(43

)