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Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	$ 4,182	$ 2,672
Derivative Asset, Fair Value, Gross Asset	$ 181	$ 99

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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