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Financial risk management (Details)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
EUR (€)
Dec. 31, 2011
EUR (€)
Dec. 31, 2010
EUR (€)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
JPY (¥)
Dec. 31, 2011
USD ($)
Dec. 31, 2011
JPY (¥)
Jun. 30, 2007
EUR (€)
Dec. 31, 2012
Sales [Member]
EUR (€)
Dec. 31, 2011
Sales [Member]
EUR (€)
Dec. 31, 2012
Cost of Sales [Member]
EUR (€)
Dec. 31, 2011
Cost of Sales [Member]
EUR (€)
Dec. 31, 2012
Fair Value Hedging [Member]
Interest Rate Swap [Member]
EUR (€)
Dec. 31, 2011
Fair Value Hedging [Member]
Interest Rate Swap [Member]
EUR (€)
Dec. 31, 2012
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
EUR (€)
Dec. 31, 2011
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
EUR (€)
Dec. 31, 2012
Cash Flow Hedging [Member]
Foreign Exchange Forward [Member]
EUR (€)
Dec. 31, 2011
Cash Flow Hedging [Member]
Foreign Exchange Forward [Member]
EUR (€)
Dec. 31, 2012
Other Hedges [Member]
Foreign Exchange Forward [Member]
EUR (€)
Dec. 31, 2011
Other Hedges [Member]
Foreign Exchange Forward [Member]
EUR (€)
Financial instruments                                        
Forward foreign exchange contracts, notional amount € 262,146,000 [1] € 389,579,000 [1]   $ 159,800,000 ¥ 8,400,000,000 $ 48,900,000 ¥ 37,200,000,000                          
Forward foreign exchange contracts, fair value 16,805,000 [1] (23,999,000) [1]                                    
Interest rate swaps, notional amount 624,900,000 [2] 641,500,000 [2]                                    
Interest rate swaps, fair value 124,050,000 [2] 109,991,000 [2]                                    
Derivative financial instruments per category                                        
Derivative assets 151,748,000 126,351,000                     128,830,000 113,924,000       5,975,000 11,332,000 16,943,000 1,095,000
Derivative liabilities 10,893,000 40,359,000                           4,780,000 3,933,000 5,688,000 3,019,000 425,000 33,407,000
Derivative assets, noncurrent 101,651,000 92,534,000                     101,651,000 92,534,000              
Derivative liabilities, noncurrent 4,032,000 3,210,000                           4,032,000 3,210,000        
Derivative assets, current 50,097,000 33,817,000                                    
Derivative liabilities, current 6,861,000 37,149,000                                    
Foreign currency market risks (Textual) [Abstract]                                        
Gain (loss) on financial instruments, net of taxes (7,547,000) 47,353,000 (1,221,000)           4,300,000 (4,400,000) (5,300,000) 10,300,000                
Total anticipated income (loss) to be released to sales/cost of sales                 4,900,000   (6,000,000)                  
Market risks and derivatives (Textual) [Abstract]                                        
Gain/(loss) on foreign currency cash flow hedge ineffectiveness 0 (200,000)                                    
Percentage of Effectiveness of Fair Value Hedges 100.00%                                      
Percentage of Effectiveness of Cash Flow Hedges 100.00%                                      
Notional principal amounts of the outstanding currency contracts 262,146,000 [1] 389,579,000 [1]   159,800,000 8,400,000,000 48,900,000 37,200,000,000                          
Derivative instruments release period 12 months                                      
Gain (Loss) in consolidated statements of operations resulting from effective cash flow hedge 8,700,000 (58,100,000) (43,500,000)                                  
Notional amount of interest rate fair value hedge derivatives 624,900,000 [2] 641,500,000 [2]                                    
Principal amount 600,000,000             600,000,000                        
Gain Loss from derivative financial instruments measured at fair value € 3,000,000 € (38,300,000) € (32,900,000)                                  
[1] Relates to forward contracts assigned as a hedge to forecasted sales and purchase transactions, to monetary assets and liabilities, mainly in U.S. dollar and Japanese Yen.
[2] Relates to interest rate swaps assigned as a hedge to interest bearing assets and liabilities mainly related to the Eurobond; the fair value of the interest rate swaps includes accrued interest.