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Foreign Currency Exchange Rate Risk Foreign Currency Exchange Rate Risk (Details 2) (Foreign exchange contracts, Not Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 4,002	$ 2,106
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 0	$ 229

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

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.

+ References+ Details