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Financial Derivatives and Hedging Activities (Details Textual)	12 Months Ended
	Dec. 31, 2012
Not designated as hedging [Member]
Financial Derivatives and Hedging Activities (Textual) [Abstract]
Maturities of foreign currency derivative contracts not designated as hedging instruments	1 month
Designated as hedging [Member]
Financial Derivatives and Hedging Activities (Textual) [Abstract]
Maximum maturity period of foreign currency derivative contracts designated as hedging instruments	12 months
Fair value Measurements [Member]
Financial Derivatives and Hedging Activities (Textual) [Abstract]
Accumulated other comprehensive income realization period	12 months