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Intangible Assets Intangible Assets | 12 Months Ended
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Dec. 31, 2020
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, 2020 |  | December 31, 2019
| Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net
Customer relationships | $ | 1,661 |  |  | $ | (470) |  |  | $ | 1,191 |  |  | $ | 1,621 |  |  | $ | (331) |  |  | $ | 1,290 |
Trade names | 565 |  |  | (65) |  |  | 500 |  |  | 541 |  |  | (40) |  |  | 501 |
Technology | 165 |  |  | (67) |  |  | 98 |  |  | 158 |  |  | (41) |  |  | 117 |
Long term supply contracts | 142 |  |  | (55) |  |  | 87 |  |  | 150 |  |  | (48) |  |  | 102 |
Patents | 16 |  |  | (12) |  |  | 4 |  |  | 14 |  |  | (9) |  |  | 5 |
| $ | 2,549 |  |  | $ | (669) |  |  | $ | 1,880 |  |  | $ | 2,484 |  |  | $ | (469) |  |  | $ | 2,015 |
Amortization expense for the years ended December 31, 2020, 2019, and 201 8 was $180, $186 and $148. Annual amortization expense for 2021 and 2022 is estimated to be $180, 2023 is estimated to be $179, 2024 is estimated to be $166, and 2025 is estimated to be $162.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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