Bank Loans (Details)	3 Months Ended
	Mar. 29, 2014
Bank Loans
Ownership interest in Spanish companies (as a percent)	50.00%
Spanish companies
Bank Loans
Ownership interest in Spanish companies (as a percent)	50.00%
Average weighted interest rate (as a percent)	3.20%
Spanish companies | Minimum
Bank Loans
Maturity period	1 year
Spanish companies | Maximum
Bank Loans
Maturity period	4 years