Debt (Financing Liability) (Details) (USD $)	1 Months Ended	3 Months Ended
	Mar. 29, 2015	Mar. 29, 2015	Mar. 30, 2014	Dec. 28, 2014
Debt Instrument [Line Items]
Financing liability	$ 31,187,000	$ 31,187,000		$ 33,094,000
SPAIN
Debt Instrument [Line Items]
Other operating income from sale of rights to future customer receivables	361,000
Financing Agreement June 2011 | SPAIN
Debt Instrument [Line Items]
Financing liability	30,100,000	30,100,000		33,094,000
Financing arrangement, imputed interest on financing liability	6.365%	6.365%
Financing arrangement, interest expense recognized		500,000	600,000
Financing Agreement 2015 [Member] | SPAIN
Debt Instrument [Line Items]
Financing liability	$ 1,100,000	$ 1,100,000