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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying amount of goodwill
The following table shows the carrying amount of goodwill by reportable unit as of December 31, 2014 and the changes in goodwill for the nine months ended September 30, 2015:
 
Biomass-based Diesel
 
Services
 
Renewable Chemicals
 
Total
Balance, December 31, 2014
$
137,348

 
$
16,080

 
$
34,847

 
$
188,275

Finalization of purchase accounting
3,202

 
—

 
—

 
3,202

Balance, September 30, 2015
$
140,550

 
$
16,080

 
$
34,847

 
$
191,477