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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of Derivative Financial Instruments by Balance Sheet Location
The following tables provide details regarding the Company’s derivative financial instruments:
   
December 31, 2017
 
December 31, 2016
   
Assets
 
Liabilities
 
Assets
 
Liabilities
Gross amounts of commodity derivative contracts recognized at fair value
$
812

 
$
8,001

 
$
1,272

 
$
3,511

Cash collateral
8,799

 
—

 
9,366

 
—

Total gross amount recognized
9,611

 
8,001

 
10,638

 
3,511

Gross amounts offset
(8,001
)
 
(8,001
)
 
(3,511
)
 
(3,511
)
Net amount reported in the Consolidated Balance Sheets
$
1,610

 
$
—

 
$
7,127

 
$
—
Summary of Derivative Financial Instruments by Location of Gain (Loss)
The following table sets forth the pre-tax gains (losses) included in the Consolidated Statements of Operations:
   
Location of Gain (Loss)
Recognized in income
 
2017
 
2016
 
2015
Commodity derivatives
Cost of goods sold – Biomass-based diesel
 
$
(23,437
)
 
$
(35,386
)
 
$
35,983