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Income taxes (Details 4) (EUR €)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of the beginning and ending balance of the liability for unrecognized tax benefits    
Beginning Balance € 155,432 € 162,066
Gross increases - tax positions in prior period 4,297 11,121
Gross decreases - tax positions in prior period (92,521) (24,566)
Gross increases - tax positions in current period 3,255 21,258
Settlements    (10,403)
Lapse of statute of limitations (10,496) (4,044)
Ending Balance € 59,967 € 155,432