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Derivative Instruments and Hedging Activities (Details 2) (Derivatives Not Designated as Hedging Instruments, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair value of derivative instruments
Asset Derivatives	$ 2,946
Liability Derivatives	520	1,522
Foreign exchange contracts \| Prepaid expenses and other
Fair value of derivative instruments
Asset Derivatives	2,946
Foreign exchange contracts \| Accrued expenses
Fair value of derivative instruments
Liability Derivatives	$ 520	$ 1,522

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