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Bank Loans (Details) (Spanish Companies)
 3 Months Ended
Mar. 31, 2015
Mar. 29, 2014
Bank Loans    
Average weighted interest rate (as a percent) 0.50%us-gaap_DebtWeightedAverageInterestRate 3.20%us-gaap_DebtWeightedAverageInterestRate
Minimum
    
Bank Loans    
Maturity period 1 year 1 year
Maximum
    
Bank Loans    
Maturity period 4 years 4 years