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Acquisitions (Narrative) (Details)
customer in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jul. 31, 2015
USD ($)
utility
state
Jul. 08, 2015
USD ($)
Sep. 30, 2015
USD ($)
state
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
state
customer
Sep. 30, 2014
USD ($)
Business Acquisition [Line Items]            
Revenues     $ 91,267 $ 68,217 $ 263,313 [1] $ 240,134
Operating income (loss)     (7,250) $ (1,607) (25,531) [1] (8,945)
Payments to Acquire Businesses, Gross         $ 41,234 [1] 0
CenStar            
Business Acquisition [Line Items]            
Number of customers | customer         16  
Purchase price   $ 8,300        
EBITDA attributable to operations, earn-out   500        
Revenues     10,400   $ 10,400  
Operating income (loss)     (1,100)   1,100  
Acquisition costs     $ 100   $ 100  
Number of states in which company operates | state     3   3  
CenStar | Senior Secured Revolving Credit Facility | Convertible Debt            
Business Acquisition [Line Items]            
Acquisition liabilities incurred   16,600        
CenStar | Senior Secured Revolving Credit Facility | Convertible Debt            
Business Acquisition [Line Items]            
Working capital   10,400        
CenStar | Censtar Convertible Debt | Convertible Debt            
Business Acquisition [Line Items]            
Acquisition liabilities incurred   $ 2,100        
Oasis Power Holdings            
Business Acquisition [Line Items]            
Number of customers | customer         43  
Purchase price $ 20,000          
Revenues     $ 10,600   $ 15,400  
Operating income (loss)         $ (500) $ 100
Number of states in which company operates | state 6   6   6  
Number of utilities | utility 18          
Oasis Power Holdings | Senior Secured Revolving Credit Facility            
Business Acquisition [Line Items]            
Acquisition liabilities incurred $ 15,000          
Oasis Power Holdings | Oasis Power Holdings Convertible Debt | Convertible Debt            
Business Acquisition [Line Items]            
Acquisition liabilities incurred $ 5,000          
[1] Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC on May 12, 2015 from an affiliate. See Note 2 “Basis of Presentation” and Note 3 "Acquisitions" for further discussion.