Retirement Plans (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
United States	$	408	$	433	$	772	$	295
Canada	40		30		86		69
United Kingdom	135		101		255		210
	$	583	$	564	$	1,113	$	574

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 six months ended June 30, 2021 and 2020 were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Interest cost	$	43	$	56	$	86	$	112
Expected return on plan assets	(62)		(58)		(124)		(115)
Recognized net actuarial loss	25		13		49		27
Net periodic pension cost	$	6	$	11	$	11	$	24

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 six months ended June 30, 2021 and 2020 were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Interest cost	$	28	$	43	$	56	$	86
Expected return on plan assets	(65)		(58)		(130)		(116)
Amortization of prior service costs and transition amount	7		6		14		12
Recognized net actuarial loss	83		63		166		126
Net periodic pension cost	$	53	$	54	$	106	$	108