Quarterly report [Sections 13 or 15(d)]

SEGMENT AND GEOGRAPHIC AREA INFORMATION - Capital expenditures by segment And Long lived assets by operating segments (Details)

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SEGMENT AND GEOGRAPHIC AREA INFORMATION - Capital expenditures by segment And Long lived assets by operating segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Total capital expenditures $ 52,060 $ 64,562  
Long-lived assets 1,378,405   $ 1,340,491
Construction-in-progress      
Segment Reporting Information [Line Items]      
Long-lived assets 266,214   244,181
Total Segment      
Segment Reporting Information [Line Items]      
Long-lived assets 1,109,280   1,093,154
Offshore Energy Services      
Segment Reporting Information [Line Items]      
Total capital expenditures 22,695 1,719  
Long-lived assets 595,556   596,687
Government services      
Segment Reporting Information [Line Items]      
Total capital expenditures 28,486 59,531  
Long-lived assets 452,380   433,721
Other Services      
Segment Reporting Information [Line Items]      
Total capital expenditures 879 $ 3,312  
Long-lived assets 61,344   62,746
Corporate      
Segment Reporting Information [Line Items]      
Long-lived assets $ 2,911   $ 3,156