Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2021

Defined Benefit Plan Disclosure

Schedule of Costs of Retirement Plans

The following table summarizes the expense associated with the contributions made to these plans for the periods presented:

	Three Months Ended March 31,
	2021		2020
United States	$	364	$	(138)
Canada	46		39
United Kingdom	119		111
	$	529	$	12

United States

Defined Benefit Plan Disclosure

Schedule of Net Benefit Costs

Net periodic pension costs for the United States defined benefit pension plan for the three months ended March 31, 2021 and 2020 were as follows:

	Three Months Ended March 31,
	2021		2020
Interest cost	$	43	$	56
Expected return on plan assets	(62)		(58)
Recognized net actuarial loss	25		13
Net periodic pension cost	$	6	$	11

United Kingdom

Defined Benefit Plan Disclosure

Schedule of Net Benefit Costs

Net periodic pension costs for the United Kingdom defined benefit pension plan for the three months ended March 31, 2021 and 2020 were as follows:

	Three Months Ended March 31,
	2021		2020
Interest cost	$	28	$	44
Expected return on plan assets	(65)		(59)
Amortization of prior service costs and transition amount	7		6
Recognized net actuarial loss	83		64
Net periodic pension cost	$	53	$	55