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Interest income and expense (Details) (EUR €)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Interest Income (Expense), Net [Abstract]      
Interest income € 16,585,000 € 41,156,000 [1] € 15,125,000
Interest income on cash pools 4,200,000 6,800,000 3,600,000
Interest expense € (22,781,000) € (33,737,000) [1] € (23,301,000)
[1] As of January 1, 2011, we adopted Accounting Standards Update ("ASU") 2009-13, "Revenue Arrangements with Multiple Deliverables" which amended ASC 605-25. The ASU was adopted prospectively and had an insignificant impact on timing and allocation of revenues. See Note 1 to the consolidated financial statements.