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Derivative Instruments and Hedging Activities - (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Derivative [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 78	$ 27
Derivative, Notional Amount	2,861invest_DerivativeNotionalAmount		1,610invest_DerivativeNotionalAmount
Derivative Asset, Fair Value, Gross Asset	$ 144		$ 222

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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