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Derivative Instruments (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Information regarding the effect of the forward contracts, net of the underlying exposure, on the Consolidated Statements of Operations
Amount of Gain (Loss) Recognized in Income on Derivatives			$ (526,000)
Derivative Instruments (Textual) [Abstract]
Net foreign currency gain (loss)	(504,000)	(328,000)	(1,265,000)
Currency forward contracts [Member] | Foreign currency gain (loss) [Member]
Information regarding the effect of the forward contracts, net of the underlying exposure, on the Consolidated Statements of Operations
Amount of Gain (Loss) Recognized in Income on Derivatives	34,000	62,000
Currency forward contracts [Member] | Prepaid expenses and other current assets [Member]
Information regarding the fair value of the forward contracts outstanding
Asset Derivatives, Fair Value	14,000	83,000
Currency forward contracts [Member] | Accrued expenses [Member]
Information regarding the fair value of the forward contracts outstanding
Liability Derivatives, Fair Value	$ 165,000	$ 125,000

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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-Publisher FASB

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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