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Income taxes (Details Textual) (EUR €)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes (Textual) [Abstract]      
Domestic income tax rate 25.00% 25.00% 25.50%
Income tax adjustment with respect to prior year taxes € (18,275,000) € (9,097,000) € (25,648,000)
Tax benefit recognized 95,465,000 6,634,000 (28,796,000)
Tax benefit recognized, percentage (8.30%) (0.40%) 2.30%
Tax audits in different jurisdictions 92,521,000 24,566,000  
Liability for unrecognized tax benefits 59,967,000 155,432,000 162,066,000
The amount of loss carry forward, tax effect 5,557,000 7,735,000 27,756,000
Dutch Statutory Tax Rate [Member]
      
Income Taxes (Textual) [Abstract]      
Domestic income tax rate 25.00% 25.00% 25.50%
Adjustments In Respect of Prior Years Current Taxes [Member]
      
Income Taxes (Textual) [Abstract]      
Income tax adjustment with respect to prior year taxes 18,300,000   25,600,000
Percentage of income from operations adjustments in respect to prior year taxes 1.60%   2.10%
Income tax adjustment with respect to prior year taxes due to innovation box     37,500,000
Percentage of income from operations adjustments in respect to prior year taxes due to innovation box     3.00%
United States Federal Tax Laws [Member]
      
Income Taxes (Textual) [Abstract]      
Total amount of loss carry forward, tax basis 503,700,000    
The amount of loss carry forward, tax effect 5,600,000    
Liability For Unrecognized Tax Benefits [Member]
      
Income Taxes (Textual) [Abstract]      
Period of uncertainty in payment of cash of unrecognized tax benefit   within one year  
Period of not expected payment of unrecognized tax benefits Non current   within one year  
Liability for unrecognized tax benefits 60,000,000 155,400,000  
Accrued interest and penalties recorded in the consolidated balance sheets 21,400,000 24,500,000  
Accrued interest and penalties recorded in the consolidated statements of operations 3,100,000 9,300,000 5,300,000
Unrecognized tax benefits that would impact effective tax rate € 3,000,000    
Period of estimated changes to the liability for unrecognized tax benefits next twelve months    
Tax Effect Carry Forward Losses [Member]
      
Income Taxes (Textual) [Abstract]      
Period of offsetting net operating losses 20 years    
Minimum offsetting period allowed by United States 5 years    
Maximum offsetting period allowed by United States 20 years