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Board of Management and Supervisory Board Remuneration (Details Textual) (EUR €) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
Measurement period long term incentive | three calendar years |  |
Board of Management and Supervisory Board Remuneration (Additional Textual) [Abstract] |  |  |
Maximum severance amount | One Year Base Salary |  |
Period for retention of options by Board of Management | 2 years |  |
Period for retention of shares by Board of Management at least | 2 years |  |
Net cost allowance paid to member's of Supervisory Board, except Chairman of the Supervisory Board | € 1,800 |  |
Net cost allowance paid to Chairman of the Supervisory Board | 2,400 |  |
Period for notice of termination from the date on which change of control occurs | 12 months |  |
Additional compensation for one U.S. member to fulfill certain obligations towards the U.S. government | 10,000 |  |
Period in which cost of shares awards are charged to the consolidated statement of operations | 3 years |  |
Period which the average share price remains fixed | 15 days |  |
Period over which the average share price remains fixed prior to closing of transactions | 30 days |  |
Percent of employee contribution in pension plan of pension base | 4.00% |  |
Share exchange ratio description | each 100 ordinary shares for 77 ordinary shares |  |
Short Term Incentive Plan [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
Number of performance criteria for short term incentive plan | 6 |  |
Cash payout based on performance evaluation | 1,800,000 |  |
Weighting of the five quantitative criteria | 80.00% |  |
Weighting of sixth performance criteria based on qualitative objectives | 20.00% |  |
Percentage target ROAIC position compare to peer group, weighted | 80.00% |  |
Qualitative target to keep performing high standards, weighted | 20.00% |  |
Financial targets Board of Management | 3 |  |
Technology leadership target Board of Management | 1 |  |
Market position target Board of Management | 1 |  |
Quantitative performance criteria Board of Management | 5 |  |
Board of Management and Supervisory Board Remuneration (Additional Textual) [Abstract] |  |  |
Technology leadership target Board of Management | 1 |  |
Market position target Board of Management | 1 |  |
Long Term Incentive Plan [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
Maximum value of performance shares award to Board of Management as a percentage of base salary | 146.25% |  |
Fixed period for performance shares to be awarded | 2 years |  |
On target level of performance related long term incentive as percentage of the base salary | 80.00% |  |
Other Members of Board of Management [Member] | Short Term Incentive Plan [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
On target level performance related to short term incentive as percentage of base salary | 60.00% |  |
Frits W. Frohlich [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
Additional remuneration vice chairman supervisory board | 3,750 |  |
E. Meurice [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
Amount of adjustment in board of management performance share | (106,266) | (148,040) | (296,287)
Period for appointments of members of board of management | 4 years |  |
Reappointment period of members of board of management | 4 years |  |
Vested shares | 37,621 |  |
P.T.F.M. Wennink [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
Amount of adjustment in board of management performance share | (65,785) | (91,645) | (183,612)
Period for appointments of members of board of management | indefinite |  |
Vested shares | 23,289 |  |
M.A. van den Brink [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
Amount of adjustment in board of management performance share | (69,831) | (97,281) | (191,972)
Period for appointments of members of board of management | indefinite |  |
Vested shares | 24,722 |  |
Chief Executive Officer [Member] | Short Term Incentive Plan [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
On target level performance related to short term incentive as percentage of base salary | 75.00% |  |
F.J. van Hout [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
Amount of adjustment in board of management performance share | (57,838) |  |
Period for appointments of members of board of management | 4 years |  |
Reappointment period of members of board of management | 4 years |  |
Vested shares | 20,474 |  |
F.J.M. Schneider Maunoury [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
Period for appointments of members of board of management | 4 years |  |
Reappointment period of members of board of management | 4 years |  |
Vice Chairman [Member] |  |  |
Board of Management and Supervisory Board Remuneration (Textual) [Abstract] |  |  |
Additional remuneration vice chairman supervisory board | € 5,000 |  |

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