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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 27, 2019
GOODWILL AND OTHER INTANGIBLE ASSETS |
Schedule of changes in the carrying value of goodwill by reporting unit |
|  | December 28, |  | Additional |  | Additions / |  | December 27,
|  | 2018 |  | Purchase Cost |  | Adjustments |  | 2019
|  | (in thousands)
Reporting Unit: |  |  |  |  |  |  |  |  |  |  |  |
Energy |  | $ | 96,999 |  | $ | 39,690 |  | $ | (9,791) |  | $ | 126,898
Engineering and Consulting |  |  | 749 |  |  |  |  |  |  |  |  | 749
|  | $ | 97,748 |  | $ | 39,690 |  | $ | (9,791) |  | $ | 127,647
|  | December 29, |  | Additional |  | Additions / |  | December 28,
|  | 2017 |  | Purchase Cost |  | Adjustments |  | 2018
|  | (in thousands)
Reporting Unit: |  |  |  |  |  |  |  |  |  |  |  |
Energy |  | $ | 37,435 |  | $ | 59,466 |  | $ | 98 |  | $ | 96,999
Engineering and Consulting |  |  | 749 |  |  | — |  |  | — |  |  | 749
|  | $ | 38,184 |  | $ | 59,466 |  | $ | 98 |  | $ | 97,748
Schedule of gross amounts and accumulated amortization of the Company's acquired identifiable intangible assets with finite useful lives |
|  | December 27, 2019 |  | December 28, 2018 |  |  |  |  |  |
|  | Gross |  | Accumulated |  | Gross |  | Accumulated |  | Amortization
|  | Amount |  | Amortization |  | Amount |  | Amortization |  | Period
|  |  |  |  |  |  |  |  |  |  |  |  |  | (in years)
Finite: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Backlog |  | $ | 7,134 |  | $ | 3,763 |  | $ | 2,514 |  | $ | 2,155 |  | 1.0
Tradename |  |  | 13,351 |  |  | 4,882 |  |  | 10,301 |  |  | 3,118 |  | 2.5 |  | - |  | 6.0
Non-compete agreements |  |  | 2,320 |  |  | 1,384 |  |  | 1,420 |  |  | 1,042 |  | 4.0 |  | - |  | 5.0
Developed technology |  |  | 14,620 |  |  | 3,227 |  |  | 12,920 |  |  | 944 |  | 8.0
Customer relationships |  |  | 60,733 |  |  | 8,065 |  |  | 25,219 |  |  | 2,441 |  | 5.0 |  | - |  | 8.0
Total finite intangible assets |  | $ | 98,158 |  | $ | 21,321 |  | $ | 52,374 |  | $ | 9,700 |  |  |  |  |  |
In-process research and technology (1) |  |  | — |  |  | — |  |  | 1,690 |  |  | — |  |  |  |  |  |
Total intangible assets |  | $ | 98,158 |  | $ | 21,321 |  | $ | 54,064 |  | $ | 9,700 |  |  |  |  |  |
| (1) |  | In-process research and technology is not amortized until put into use.
Schedule of estimated amortization expense for acquired identifiable intangible assets |
|  |  | Future Intangible Asset
|  |  | Amortization expense
|  |  | (in thousands)
Fiscal year: |  |  |
2020 |  |  | 13,025
2021 |  |  | 11,622
2022 |  |  | 11,233
2023 |  |  | 9,962
2024 |  |  | 6,871
Thereafter |  |  | 24,124
|  | $ | 76,837

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