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Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Changes in restructuring liability
Severance and related costs	$ 10us-gaap_RestructuringCharges	$ 200us-gaap_RestructuringCharges
Severance
Changes in restructuring liability
Balance at the beginning of the period	481
Severance and related costs	10
Cash payments	(315)
Balance at the end of the period	$ 176

- 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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