Additional Financial Statement Information (Schedule of Other Items in Operations) (Details) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jun. 27, 2015	Jun. 28, 2014	Sep. 27, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Foreign exchange loss	$ (279)				$ (90)		$ (1,238)	$ (515)
Interest income	36				82		91	120
Other	(171)				(239)		(196)	(288)
Other Nonoperating Income (Expense)	$ (414)	$ (929)	$ (180)	$ 123	$ (247)	$ (436)	$ (1,343)	$ (683)	$ (560)	$ (740)	$ (1,354)	$ 331