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5. Restricted Cash and Investments (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Restricted Cash and Investments [Abstract]    
Restricted cash $ 63,234 $ 49,818
Restricted investments 339,926 357,235
Restricted cash and investments, noncurrent 403,160 407,053
Restricted cash, current $ 39,756 $ 74,695
Solar module collection and recycling custodial account 90 days  
Product minimum service life 25 years