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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, 2012	Dec. 31, 2011	Dec. 31, 2010
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		1,600,000	0
Number of shares sold by Related Party.		0
Number of board members Related Party can nominate		1
Number of Related Party Representatives on Board		0
Revenue from Related Parties		$ 6,458,000	$ 7,119,000	$ 4,645,000

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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- Definition

Number of new stock issued during the period.

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- Definition

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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