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SEGMENT AND GEOGRAPHICAL INFORMATION - Segment Assets (Details) - USD ($) $ in Thousands	Jul. 01, 2022	Dec. 31, 2021	Jul. 02, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	$ 381,883	$ 394,422	$ 380,487
Energy
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	323,070		322,255
Engineering and Consulting
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	23,293		22,952
Operating Segments [Member] | Energy
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	323,070		322,255
Operating Segments [Member] | Engineering and Consulting
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	23,293		22,952
Corporate, Non-Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	58,650		58,410
Intersegment Eliminations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	$ (23,130)		$ (23,130)

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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