Fair Value Measurements (Reconciliation of Beginning and Ending Level 3 Net Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 04, 2015	Sep. 28, 2014	Oct. 04, 2015	Sep. 28, 2014
Fair Value Disclosures [Abstract]
Balance beginning of period	$ (475)	$ (3,430)	$ (91)	$ (4,926)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0	0	(475)	0
Payments	26	2,137	36	2,065
Change in fair value (included within selling, general and administrative expenses)	(70)	7	11	1,575
Balance end of period	$ (519)	$ (1,286)	$ (519)	$ (1,286)