Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2019

Defined Benefit Plan Disclosure

Schedule of Costs of Retirement Plans

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

	Three Months Ended March 31,
	2019		2018
United States	$	550	$	544
Canada	38		33
United Kingdom	107		117
	$	695	$	694

Pension Plan | 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, 2019 and 2018 were as follows:

	Three Months Ended March 31,
	2019		2018
Interest cost	$	162	$	155
Expected return on plan assets	(180)		(213)
Recognized net actuarial loss	31		24
Net periodic pension cost (income)	$	13	$	(34)

Pension Plan | 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, 2019 and 2018 were as follows:

	Three Months Ended March 31,
	2019		2018
Interest cost	$	54	$	53
Expected return on plan assets	(62)		(72)
Amortization of prior service costs and transition amount	11		5
Recognized net actuarial loss	53		49
Net periodic pension cost	$	56	$	35