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Employee benefit plans (Tables)
6 Months Ended
Jun. 30, 2020
Employee benefit plans  
Summary of the components of net periodic benefit cost

Three Months Ended June 30, 

Six Months Ended June 30, 

2020

2019

2020

2019

Interest cost

$

5

$

5

$

9

$

10

Expected return on plan assets

(7)

(6)

(13)

(12)

Amortization of net gain

1

1

Expenses paid

1

1

Net periodic benefit cost

$

(1)

$

(1)

$

(2)

$

(1)