Restructuring Charges (Details) - Office Vacancies - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014
Restructuring reserve balance
Balance at the beginning of the period	$ 462	$ 1,170
Amounts paid, net of amounts received	(424)	(452)
Adjustments		20
Balance at the end of the period	$ 38	$ 738