Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016
Noncash investing and financing activities:
Property, plant and equipment purchases included in accounts payable	$ 6,406	$ 5,062
Purchase of technology included in accrued expenses	0	1,000
Divestiture of noncash assets	0	54,591
Divestiture of liabilities	$ 0	$ 2,119