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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2021
Employee Benefit Plans  
Schedule of net periodic benefit cost

The net periodic benefit cost was as follows (in thousands):

Three Months Ended

Six Months Ended

June 30,

June 30,

    

2021

2020

    

2021

2020

    

Service cost

 

$

1,997

$

1,477

 

$

3,952

$

2,934

 

Interest cost

 

23

47

 

45

93

 

Expected return on plan assets

 

(15)

(31)

 

(30)

(61)

 

Amortization of prior service cost

 

54

53

 

108

107

 

Amortization of actuarial losses

288

167

576

334

Net periodic benefit cost

 

$

2,347

$

1,713

 

$

4,651

$

3,407