Foreign Currency Exchange Contracts and Hedging (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2011
Foreign currency exchange contracts and hedging
Reclassification period of total accumulated other comprehensive income expected to be transferred into income, maximum	nine months
Designated derivatives \| Foreign currency exchange contracts
Summary of the effect of derivative instruments on the condensed consolidated statement of income
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	$ (3,011)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	201
Gain (Loss) from Amount Excluded from Effectiveness Testing	(10)
Non-designated derivatives \| Foreign currency exchange contracts
Summary of the effect of derivative instruments on the condensed consolidated statement of income
Amount of Gain (Loss) Recognized in Income on Derivatives	(670)
Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Maturity of foreign currency forward or option contracts, maximum (in months)	12
Notional amount of foreign currency hedging contract	$ 57,000
Number of counterparties in derivative contracts	2

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.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Date when foreign currency exchange rate derivatives mature or expire.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Glossary Notional Amount
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