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Bank Loans (Details) - Spanish Companies
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Bank Loans    
Average weighted interest rate (as a percent) 1.90% 2.00%
Minimum    
Bank Loans    
Maturity period 1 year 1 year
Maximum    
Bank Loans    
Maturity period 2 years 2 years