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Employee benefit plans (Tables)
3 Months Ended
Mar. 31, 2021
Employee benefit plans  
Schedule of components of net periodic benefit cost

Pension Benefits

Three Months Ended March 31, 

    

2021

    

2020

Components of net periodic pension benefit:

    

    

Interest cost

$

105

$

54

Expected return on plan assets

 

(322)

 

(123)

Amortization of unrecognized net gain

 

76

 

22

Net periodic benefit

$

(141)

$

(47)