Retirement Plans (Tables)

9 Months Ended

Sep. 30, 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 September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
United States	$	400	$	346	$	1,172	$	558
Canada	33		25		119		93
United Kingdom	131		111		386		321
	$	564	$	482	$	1,677	$	972

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 and nine months ended September 30, 2021 and 2020 were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Interest cost	$	43	$	56	$	129	$	168
Expected return on plan assets	(62)		(58)		(185)		(173)
Recognized net actuarial loss	25		13		74		40
Net periodic pension cost	$	6	$	11	$	18	$	35

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 and nine months ended September 30, 2021 and 2020 were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Interest cost	$	28	$	43	$	84	$	129
Expected return on plan assets	(65)		(59)		(195)		(177)
Amortization of prior service costs and transition amount	7		6		21		18
Recognized net actuarial loss	83		63		249		189
Net periodic pension cost	$	53	$	53	$	159	$	159