Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016
Noncash investing and financing activities:
Property, plant and equipment purchases included in accounts payable	$ 4,825	$ 9,696
Purchase of technology included in accrued expenses	0	1,000
Divestiture of noncash assets	0	54,591
Divestiture of liabilities	$ 0	$ 2,119