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Employee benefit plans (Tables)
9 Months Ended
Sep. 30, 2020
Employee benefit plans  
Schedule of components of net periodic benefit cost

Pension Benefits

Three Months Ended September 30, 

    

2020

    

2019

Components of net periodic pension benefit:

    

    

Interest cost

$

164

$

128

Expected return on plan assets

 

(371)

 

(217)

Amortization of unrecognized net gain

 

65

 

45

Net periodic benefit

$

(142)

$

(44)

Pension Benefits

Nine Months Ended September 30, 

    

2020

    

2019

Components of net periodic pension benefit:

    

    

Interest cost

$

381

$

447

Expected return on plan assets

 

(865)

 

(759)

Amortization of unrecognized net gain

 

152

 

159

Net periodic benefit

$

(332)

$

(153)