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Accounts receivable (Details) (EUR €)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts receivable      
Accounts receivable, gross € 607,359 € 883,209  
Allowance for doubtful receivables (2,071) (2,582) (1,945)
Accounts receivable, net 605,288 880,627  
Allowance for doubtful receivables      
Allowance for doubtful receivables, Beginning Balance (2,582) (1,945)  
Addition for the year (458) [1] (849) [1] 1,256
Utilization of the provision 969 212  
Allowance for doubtful receivables, Ending Balance € (2,071) € (2,582) € (1,945)
[1] Addition for the year is recorded in cost of sales.