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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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.

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- Definition

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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Financial Instruments and Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2010 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2011 Forward Contracts [Member] Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2011 Forward Contracts [Member] Designated as Hedging Instrument [Member] EUR (€)	Dec. 31, 2010 Forward Contracts [Member] Designated as Hedging Instrument [Member] USD ($)
Derivatives, Fair Value [Line Items]
Foreign exchange contracts to purchase foreign currencies				$ 200,000
Fair value of derivative instruments, liability				100,000	200,000
Forward contract to sell foreign currency							30,000,000
Fair value of derivative instruments, asset						3,500,000		2,700,000
Bad debt expense	$ 878,000	$ 49,000	$ 1,271,000