Retirement Plans (Tables)

6 Months Ended

Jun. 30, 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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
United States	$	680	$	770	$	1,230	$	1,314
Canada	34		34		72		68
United Kingdom	118		98		225		214
	$	832	$	902	$	1,527	$	1,596

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 and six months ended June 30, 2019 and 2018 were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Interest cost	$	162	$	155	$	324	$	311
Expected return on plan assets	(180)		(213)		(360)		(427)
Recognized net actuarial loss	31		24		63		48
Net periodic pension cost (income)	$	13	$	(34)	$	27	$	(68)

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 and six months ended June 30, 2019 and 2018 were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Interest cost	$	54	$	52	$	108	$	104
Expected return on plan assets	(61)		(71)		(122)		(142)
Amortization of prior service costs and transition amount	11		5		22		10
Recognized net actuarial loss	53		49		106		98
Net periodic pension cost	$	57	$	35	$	114	$	70