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Derivative Instruments (Details Textual) In Millions, unless otherwise specified | Dec. 31, 2011 USD ($) | Dec. 31, 2011 EUR (€) | Dec. 31, 2010 USD ($)
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Derivatives Instruments (Textual) [Abstract] |  |  |
Minimum variable interest rate on Debt | 0.30% | 0.30% |
Maximum variable interest rate on Debt | 2.75% | 2.75% |
Reduced Principal amount denominated Interest rate swaps | $ 90.9 | € 70.1 |
Derivative Fair value Liabilities, net | $ (0.6) |  | $ (10.0)

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