Summary of Significant Accounting Policies - Supplemental Cash Flow Items (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015
Supplemental Disclosures of Cash Flow Information
Interest paid	$ 3,741	$ 12,400
Taxes paid	2,479	150
Non-cash activities:
Purchases of property and equipment not paid	$ 1,278	$ 1,871