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Acquisitions - Summary of Fair Value Assets and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Goodwill $ 87,555 $ 51,786
Clean Energy Experts, LLC    
Business Acquisition [Line Items]    
Cash and cash equivalents 424  
Accounts receivable 639  
Intangible assets 13,290  
Accounts payable and accrued liabilities (1,247)  
Deferred tax liability (5,158)  
Identifiable assets and liabilities assumed 7,948  
Goodwill 35,769  
Total $ 43,717