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

6 Months Ended

Jun. 30, 2018

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						Six Months Ended
	June 30, 2018			July 1, 2017			June 30, 2018			July 1, 2017
Components of pension expense (income)
Service costs--increase in benefit obligation earned	$	100		$	132		$	200		$	265
Interest cost on projected benefit obligation	179			264			359			527
Expected return on plan assets	(57		)	(170		)	(115		)	(339		)
Amortization of net actuarial loss	182			238			364			475
Amortization of prior service cost	16			15			32			31
Net pension expense of defined benefit pension plans	$	420		$	479		$	840		$	959