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SEGMENT AND GEOGRAPHICAL INFORMATION - Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jul. 01, 2022 | Apr. 01, 2022 | Jun. 30, 2023 | Jul. 01, 2022
Segment reconciliation |  |  |  |  |  |
Contract revenue | $ 119,077 |  | $ 102,645 |  | $ 221,680 | $ 194,483
Depreciation and amortization | 4,128 |  | 4,426 |  | 8,328 | 8,835
Interest expense, net | 2,207 |  | 1,030 |  | 4,673 | 1,781
Segment profit (loss) before income tax expense | 640 |  | (5,999) |  | 2,328 | (12,161)
Income tax expense (benefit) | 243 |  | (1,673) |  | 999 | (4,062)
Net Income (Loss) | 397 | $ 932 | (4,326) | $ (3,773) | 1,329 | (8,099)
Energy |  |  |  |  |  |
Segment reconciliation |  |  |  |  |  |
Contract revenue | 98,015 |  | 84,675 |  | 181,300 | 159,561
Engineering and Consulting |  |  |  |  |  |
Segment reconciliation |  |  |  |  |  |
Contract revenue | 21,062 |  | 17,970 |  | 40,380 | 34,922
Operating Segments | Energy |  |  |  |  |  |
Segment reconciliation |  |  |  |  |  |
Contract revenue | 98,015 |  | 84,675 |  | 181,300 | 159,561
Depreciation and amortization | 3,877 |  | 4,183 |  | 7,801 | 8,340
Interest expense, net | 1 |  | 1 |  | 3 | 5
Segment profit (loss) before income tax expense | 603 |  | (6,357) |  | 3,374 | (10,710)
Income tax expense (benefit) | 207 |  | (1,891) |  | 1,448 | (3,578)
Net Income (Loss) | 397 |  | (4,467) |  | 1,927 | (7,132)
Operating Segments | Engineering and Consulting |  |  |  |  |  |
Segment reconciliation |  |  |  |  |  |
Contract revenue | 21,062 |  | 17,970 |  | 40,380 | 34,922
Depreciation and amortization | 251 |  | 243 |  | 527 | 495
Segment profit (loss) before income tax expense | 3,218 |  | 2,531 |  | 5,805 | 4,638
Income tax expense (benefit) | 1,332 |  | 732 |  | 2,490 | 1,549
Net Income (Loss) | 1,885 |  | 1,798 |  | 3,313 | 3,088
Corporate, Non-Segment |  |  |  |  |  |
Segment reconciliation |  |  |  |  |  |
Interest expense, net | 2,206 |  | 1,029 |  | 4,670 | 1,776
Segment profit (loss) before income tax expense | (3,181) |  | (2,173) |  | (6,851) | (6,089)
Income tax expense (benefit) | (1,296) |  | (514) |  | (2,939) | (2,033)
Net Income (Loss) | $ (1,885) |  | $ (1,657) |  | $ (3,911) | $ (4,055)

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