Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Company's derivative instruments recorded at fair value
Total derivatives assets	$ 31
Not Designated as Hedging Instrument
Derivative Instruments
Typical hedge period, maximum	1 year
Company's derivative instruments recorded at fair value
Total derivatives assets	31
Foreign currency option contracts | Not Designated as Hedging Instrument | Other current assets
Company's derivative instruments recorded at fair value
Total derivatives assets	$ 31