Financial Derivatives and Hedging Activities (Details 2) (Forward foreign currency exchange contracts [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Prepaid and Other Current Assets [Member] | Designated as hedging [Member]
Derivative at fair value
Derivative asset, fair value	$ 398	$ 1,520
Prepaid and Other Current Assets [Member] | Not designated as hedging [Member]
Derivative at fair value
Derivative asset, fair value	6	338
Other current liabilities [Member] | Designated as hedging [Member]
Derivative at fair value
Derivative liability, fair value	104
Other current liabilities [Member] | Not designated as hedging [Member]
Derivative at fair value
Derivative liability, fair value	$ 99	$ 15