Quarterly report pursuant to Section 13 or 15(d)

Investment Fund (Details)

v3.4.0.3
Investment Fund (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Restricted Cash    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, assets $ 1,556 $ 5,419
Project Assets    
Variable Interest Entity [Line Items]    
Variable interest entity, carrying amount, assets $ 33,096 $ 32,657