Foreign Currency Exchange Contracts and Hedging (Details) (Foreign currency exchange contracts, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Counterparty	Dec. 31, 2010
Foreign currency exchange contracts and hedging
Notional amounts of foreign currency hedging contracts	$ 66,000
Number of counterparties in derivative contracts	1
Maturity of foreign currency forward or option contracts, maximum (in months)	12 months
Reclassification period of total accumulated other comprehensive income expected to be transferred into income, maximum (in months)	15 months
Summary of the effect of derivative instruments on the consolidated statements of income
Amount of Gain (Loss) Recognized in Income on Derivatives Not Designated as Hedging Instruments	(541)	(95)
Derivatives designated as cash flow hedges
Summary of the effect of derivative instruments on the consolidated statements of income
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	(1,376)	2,566
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	125
Gain (Loss) from Amount Excluded from Effectiveness Testing	$ (260)	$ (133)

Represents the number of counterparties to derivative hedging contracts.

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The time period estimated for the anticipated transfer of gains (losses), net from accumulated other comprehensive income into earnings.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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The net gain (loss) relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Date when foreign currency exchange rate derivatives mature or expire.

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Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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