Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Transactions involving cash:
Interest paid	$ 17,337	$ 13,592
Interest received	400	54
Income taxes paid	1,583	2,763
Income tax refunds	70	13
Non-cash transactions:
Property, plant and equipment additions in accounts payable	$ 2,949	$ 3,984