Reconciliation of Total Segment Profit to Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Profit	$ 81,997	$ 59,467
Amortization	10,945	11,289
Unallocated General And Administrative Expenses	20,132	18,619
Operating income	50,920	29,559
Interest expense	8,473	9,218
Interest income	(80)	(69)
Other income, net	902	(675)
Income before income tax expense	$ 41,625	$ 21,085