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Subsequent Events (Details) - USD ($)
$ in Thousands
Sep. 06, 2016
Jul. 31, 2016
Oct. 31, 2015
Subsequent Event [Line Items]      
Proceeds received from sale of project assets $ 9,900    
Long-term Line of Credit   $ 0 $ 2,945
NRG Energy, Inc. [Member]      
Subsequent Event [Line Items]      
Long-term Line of Credit $ 1,400 $ 10,963 $ 3,763