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Variable Interest Entities (Details Textual) (USD $)	3 Months Ended		6 Months Ended
Variable Interest Entities (Details Textual) (USD $)	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Variable Interest Entity [Line Items]
Revenue from Related Parties	$ 9,744,000us-gaap_RevenueFromRelatedParties	$ 10,140,000us-gaap_RevenueFromRelatedParties	$ 18,362,000us-gaap_RevenueFromRelatedParties	$ 18,199,000us-gaap_RevenueFromRelatedParties
ES Windows LLC [Member]
Variable Interest Entity [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%		100.00%
Accounts Receivable, Related Parties	13,600,000		13,600,000		11,800,000
Revenue from Related Parties	9,600,000	7,300,000	18,100,000	11,600,000
Ventanas Solar SA [Member]
Variable Interest Entity [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%		100.00%
Accounts Receivable, Related Parties	$ 600,000		$ 600,000		$ 2,700,000
Sales Revenue Description	less than $0.1 million	less than $0.1 million	less than $0.1 million	less than $0.1 million

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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- Definition

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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