Derivatives and Hedging Activities (Details 1) (Derivatives designated as cash flow hedging instruments [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Reconciliation of Gain (Loss) by Hedging Instruments, by Income Statement Location
Gain (loss) recognized in other comprehensive income (loss), effective portion, Net, Total	$ 56	$ (338)	$ (12)	$ (123)
Gain (loss) reclassified from accumulated OCI into income, effective portion, Net, Total	60	(41)	212	(283)
Foreign Exchange Option Contracts [Member]
Reconciliation of Gain (Loss) by Hedging Instruments, by Income Statement Location
Gain (loss) recognized in other comprehensive income (loss), effective portion, Net, Total	42	(113)	(19)	42
Gain (loss) reclassified from accumulated OCI into income, effective portion, Net, Total	33	(12)	137	(240)
Foreign Exchange Forward Contracts [Member]
Reconciliation of Gain (Loss) by Hedging Instruments, by Income Statement Location
Gain (loss) recognized in other comprehensive income (loss), effective portion, Net, Total	14	(225)	7	(165)
Gain (loss) reclassified from accumulated OCI into income, effective portion, Net, Total	$ 27	$ (29)	$ 75	$ (43)