Financial Derivatives and Hedging Activities (Details Textual)	9 Months Ended
	Sep. 30, 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