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Intangible Assets
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
INTANGIBLE ASSETS
Amortizing intangible assets consist of the following at December 31:
 
December 31, 2017
 
Cost
 
Accumulated Amortization
 
Net
 
Weighted Average Remaining Life
Raw material supply agreement
$
6,230

 
$
(2,408
)
 
$
3,822

 
8.0 years
Renewable diesel technology
8,300

 
(1,983
)
 
6,317

 
11.5 years
Acquired customer relationships
2,900

 
(686
)
 
2,214

 
7.6 years
Ground lease
200

 
(141
)
 
59

 
3.9 years
In-process research and development
15,956

 
(1,241
)
 
14,715

 
13.8 years
Total intangible assets
$
33,586

 
$
(6,459
)
 
$
27,127

 
 
 
December 31, 2016
 
Cost
 
Accumulated Amortization
 
Net
 
Weighted Average Remaining Life
Raw material supply agreement
$
6,230

 
$
(1,987
)
 
$
4,243

 
9.0 years
Renewable diesel technology
8,300

 
(1,429
)
 
6,871

 
12.5 years
Acquired customer relationships
2,900

 
(396
)
 
2,504

 
8.6 years
Ground lease
200

 
(127
)
 
73

 
4.9 years
In-process research and development
15,956

 
(177
)
 
15,779

 
14.8 years
Total intangible assets
$
33,586

 
$
(4,116
)
 
$
29,470

 
 

The raw material supply agreement acquired is amortized over its 15 year term based on actual usage under the agreement and expires in 2025. The Company determined the estimated amount of raw materials to be purchased over the life of the agreement to calculate a per pound rate of consumption. The rate is then multiplied by the actual usage each period for expense reporting purposes.
Amortization expense of $2,343, $1,471 and $1,112 for intangible assets was recorded for the years ended December 31, 2017, 2016 and 2015, respectively.
Estimated amortization expense for fiscal years ended December 31 is as follows:
2018
$
2,425

2019
2,433

2020
2,440

2021
2,447

2022
2,441

Thereafter
14,941

Total
$
27,127