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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Intangible assets
Amortizing intangible assets consist of the following at December 31:
 
December 31, 2019
 
Cost
 
Accumulated Amortization
 
Net
Raw material supply agreement
$
6,230

 
$
(3,368
)
 
$
2,862

Renewable diesel technology
8,300

 
(3,089
)
 
5,211

Acquired customer relationships
4,747

 
(1,535
)
 
3,212

Other intangible assets
904

 
(171
)
 
733

Total intangible assets
$
20,181

 
$
(8,163
)
 
$
12,018

 
December 31, 2018
 
Cost
 
Accumulated Amortization
 
Net
Raw material supply agreement
$
6,230

 
$
(2,866
)
 
$
3,364

Renewable diesel technology
8,300

 
(2,536
)
 
5,764

Acquired customer relationships
4,747

 
(976
)
 
3,771

Other intangible assets
904

 
(157
)
 
747

Total intangible assets
$
20,181

 
$
(6,535
)
 
$
13,646
Estimated amortization expense
Estimated amortization expense for fiscal years ended December 31 is as follows:
2020
$
1,682

2021
1,688

2022
1,681

2023
1,688

2024
1,695

Thereafter
3,584

Total
$
12,018