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Derivative Instruments and Hedging Activities - (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Derivative, Notional Amount	$ 3,723	$ 2,672
Derivative Asset, Fair Value, Gross Asset	$ (64)	$ 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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