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Related Parties (Details Textual) (USD $)	3 Months Ended			6 Months Ended
Related Parties (Details Textual) (USD $)	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2000	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
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
Accounts receivable balance related to amounts owed by Enel and its designated manufacturers	112,000			112,000		1,600,000
Number of shares sold by Related Party.	0			0
Number of board members Related Party can nominate	1			1
Number of Related Party Representatives on Board	0			0
Revenue from Related Parties	$ 427,000	$ 4,187,000		$ 1,976,000	$ 6,077,000

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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