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Related Parties (Details Textual) (USD $)	3 Months Ended	12 Months Ended
Related Parties (Details Textual) (USD $)	Jun. 30, 2000	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Parties - Enel (Additional Textual) [Abstract]
Stock Issued During Period, Value, New Issues	$ 130,700,000
Stock Issued During Period, Shares, New Issues	3,000,000
Number of shares sold by Related Party.			0elon_NumberOfSharesSoldByRelatedParty
Number of board members Related Party can nominate			1
Number of Related Party Representatives on Board			0
Revenue from Related Parties		$ 2,993,000us-gaap_RevenueFromRelatedParties	$ 7,363,000us-gaap_RevenueFromRelatedParties	$ 6,458,000us-gaap_RevenueFromRelatedParties

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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