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Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014 Position
Restructuring Charges [Abstract]
Number of workforce reduced		93
Percentage of reduction in workforce (in hundredths)		11.00%
Restructuring charge	$ 0us-gaap_RestructuringCharges	$ 907us-gaap_RestructuringCharges

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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