Employee benefit plans (Tables)

3 Months Ended

Mar. 31, 2019

Employee benefit plans

Summary of the components of net periodic benefit (credits) cost

	Three Months Ended March 31,
	Pension
	2019		2018
Service cost	$	1	$	2
Interest cost		6		—
Expected return on plan assets		(6)		—
Expenses paid		—		—
Net periodic benefit (credit) cost	$	1	$	2