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Employee benefit plans (Tables)
3 Months Ended
Mar. 31, 2019
Employee benefit plans  
Schedule of net periodic benefit cost

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

 

 

 

 

 

 

 

 

 

 

Three Months Ended

 

 

 

March 31,

 

 

    

2019

 

2018

 

Service cost

 

$

1,263

 

$

1,079

 

Interest cost

 

 

84

 

 

71

 

Expected return on plan assets

 

 

(60)

 

 

(50)

 

Amortization of prior service cost

 

 

45

 

 

45

 

Amortization of actuarial losses

 

 

66

 

 

66

 

Net periodic benefit cost

 

$

1,398

 

$

1,211