Net Periodic Benefit Expense - Defined Benefit Pension Plans (Tables)

9 Months Ended

Sep. 26, 2020

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Schedule of defined benefit pension plans, components of pension expense [Table Text Block]

The results of operations included the following net periodic benefit expense (income) recognized related to our defined-benefit pension plans.

	Three Months Ended				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Components of pension expense (income)
Service costs--increase in benefit obligation earned	$	—	$	—	$	—	$	75
Interest cost on projected benefit obligation	26		31		79		167
Expected return on plan assets	—		—		—		(37)
Settlement loss	—		—		—		1,677
Amortization of net actuarial loss	22		6		66		81
Amortization of prior service cost	16		16		48		48
Net pension expense of defined benefit pension plans	$	64	$	53	$	193	$	2,011