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Intangible Assets Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets

Gross carrying amounts and accumulated amortization of finite-lived intangible assets by major class were as follows:

 
December 31, 2019
 
December 31, 2018
 
Gross
 
Accumulated amortization
 
Net
 
Gross
 
Accumulated amortization
 
Net
Customer relationships
$
1,621

 
$
(331
)
 
$
1,290

 
$
1,615

 
$
(206
)
 
$
1,409

Trade names
541

 
(40
)
 
501

 
547

 
(17
)
 
530

Technology
158

 
(41
)
 
117

 
160

 
(18
)
 
142

Long term supply contracts
150

 
(48
)
 
102

 
143

 
(37
)
 
106

Patents
14

 
(9
)
 
5

 
14

 
(8
)
 
6

 
$
2,484

 
$
(469
)
 
$
2,015

 
$
2,479

 
$
(286
)
 
$
2,193



Amortization expense for the years ended December 31, 2019, 2018, and 2017 was $186, $148 and $39.

Annual amortization expense for each of the years from 2020 - 2023 is estimated to be $167 and 2024 is estimated to be $159.