Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Sale-Leaseback (Details)

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Summary of Significant Accounting Policies - Sale-Leaseback (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
project
Mar. 31, 2015
USD ($)
project
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Sale Leaseback Transaction [Line Items]        
Proceeds from sale of solar-PV projects     $ 7,581 $ 0
Solar Photovoltaic Projects        
Sale Leaseback Transaction [Line Items]        
Maximum combined funding amount $ 50,000   $ 50,000  
Number of solar photovoltaic projects sold | project 0 2    
Proceeds from sale of solar-PV projects   $ 7,581    
Percentage of fair value threshold, integral equipment     10.00%  
Sale leaseback transaction, deferred gain   1,029    
Capital lease assets   $ 3,511    
Capital lease liabilities $ 3,511   $ 3,511  
Lease terms (in years)   20 years    
Solar Photovoltaic Projects | Minimum        
Sale Leaseback Transaction [Line Items]        
Monthly payments   $ 43    
Solar Photovoltaic Projects | Maximum        
Sale Leaseback Transaction [Line Items]        
Monthly payments   $ 414