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Goodwill (Details) (EUR €) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Changes in goodwill
Goodwill, Beginning balance	€ 146,044	€ 141,286
Acquisition subsidiary	6,038
Effect of changes in exchange rates	(2,914)	4,758
Goodwill, Ending balance	149,168	146,044
Goodwill impairment test (Textual) [Abstract]
Impairment charges of goodwill	€ 0	€ 0
Date of annual goodwill impairment test	30 September

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The date of the annual goodwill impairment test.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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