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Assets Held and Liability for Employees' Severance Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets Held and Liability for Employees' Severance Benefits [Abstract]
Severance costs	$ 432us-gaap_SeveranceCosts1	$ 578us-gaap_SeveranceCosts1	$ 382us-gaap_SeveranceCosts1

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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