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Related Parties (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Related Party Transactions [Line Items]            
Related Party Transaction, Description of Transaction less than $0.7 million less than $0.1 million $0.4 million less than $0.1 million    
Ventanas Solar [Member]            
Related Party Transactions [Line Items]            
Trade Receivables Held-for-sale, Reconciliation to Cash Flow, Deductions from Held-for-sale         $ 6.6  
Debt Instrument, Description of Variable Rate Basis         Libor + 4.7%  
Santa Maria Del Mar SA [Member]            
Related Party Transactions [Line Items]            
Guarantor Obligations, Current Carrying Value           $ 0.2
ESW LLC [Member]            
Related Party Transactions [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages         $ 3.9