Summary of Significant Accounting Policies - Supplemental Cash Flow Items (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Supplemental Disclosures of Cash Flow Information
Interest paid	$ 2,081	$ 11,397
Taxes paid	0	0
Non-cash activities:
Purchases of property and equipment not paid	$ 215	$ 714