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

3 Months Ended

Mar. 31, 2018

Defined Benefit Plan, Net Periodic Benefit Cost [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
	March 31, 2018			April 1, 2017
Components of pension expense (income)
Service costs--increase in benefit obligation earned	$	100		$	133
Interest cost on projected benefit obligation	180			263
Expected return on plan assets	(58		)	(169		)
Amortization of net actuarial loss	182			237
Amortization of prior service cost	16			16
Net pension expense of defined benefit pension plans	$	420		$	480