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Derivative Instruments and Risk Management (Details Textual)	3 Months Ended
	Mar. 31, 2013
Derivative instruments and risk management (Textual) [Abstract]
Maturity period of foreign currency forward exchange contracts	4 years

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- Details

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- Definition

High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

+ Details

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