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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Related Parties
-URI http://asc.fasb.org/extlink&oid=16382449

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Related Parties (Details Textual) shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2000 USD ($) shares	Sep. 30, 2016 USD ($) board_member shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) board_member shares	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Related Parties - Enel (Additional Textual) [Abstract]
Stock Issued During Period, Shares, New Issues \| shares	300
Stock Issued During Period, Value, New Issues	$ 130,700
Number of shares sold by Related Party. \| shares		0		0
Number of board members Related Party can nominate \| board_member		1		1
Number of Related Party Representatives on Board \| board_member		0		0
Revenue from Related Parties		$ 0	$ 1,680	$ 1,312	$ 3,465
Accounts receivable balance related to amounts owed by Enel and its designated manufacturers		$ 0		$ 0		$ 827