Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - Reclassification out of Accumulated Other Comprehensive Income - Post Retirement Obligations $ in Thousands	3 Months Ended
	Apr. 01, 2017 USD ($)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Service cost	$ 36
Reclassifications net of tax	$ 36