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BUSINESS SEGMENT INFORMATION - Summarized financial information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Revenues:          
Revenues $ 337,652 $ 330,417 $ 1,079,638 $ 1,222,943  
Operating income:          
Total operating income 19,204 22,711 87,021 195,737  
Pension settlement charges       18,286  
Gain on disposition of assets, net 1,790 1,778 6,342 7,729  
Interest expense (261) (101) (594) (246)  
Interest income 3,523 1,450 9,831 6,003  
Other income, net 1,005 804 2,504 2,196  
Income before income taxes 23,471 24,864 98,762 203,690  
Depreciation and amortization 35,034 28,388 97,371 78,716  
Capital expenditures     179,460 148,816  
Identifiable assets 1,330,597 1,247,373 1,330,597 1,247,373 $ 1,286,845
Technical Services          
Revenues:          
Revenues 313,492 303,069 1,011,370 1,145,078  
Support Services          
Revenues:          
Revenues 24,160 27,348 68,268 77,865  
Corporate expenses          
Operating income:          
Corporate Expense (4,216) (4,840) (11,083) (14,593)  
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]          
Operating income:          
Pension settlement charges       18,286  
Gain on disposition of assets, net 1,790 1,778 6,342 7,729  
Depreciation and amortization     58 38  
Capital expenditures     1,966 3,420  
Identifiable assets 345,819 289,398 345,819 289,398  
Operating segments          
Revenues:          
Revenues 337,652 330,417 1,079,638 1,222,943  
Operating income:          
Total operating income 19,204 22,711 87,021 195,737  
Interest expense (261) (101) (594) (246)  
Interest income 3,523 1,450 9,831 6,003  
Other income, net 1,005 804 2,504 2,196  
Income before income taxes 23,471 24,864 98,762 203,690  
Operating segments | Technical Services          
Revenues:          
Revenues 313,492 303,069 1,011,370 1,145,078  
Operating income:          
Total operating income 16,344 18,912 78,498 199,462  
Depreciation and amortization     88,272 71,175  
Capital expenditures     159,743 136,237  
Identifiable assets 896,021 873,819 896,021 873,819  
Operating segments | Support Services          
Revenues:          
Revenues 24,160 27,348 68,268 77,865  
Operating income:          
Total operating income 5,286 6,861 13,264 21,425  
Depreciation and amortization     9,041 7,503  
Capital expenditures     17,751 9,159  
Identifiable assets $ 88,757 $ 84,156 $ 88,757 $ 84,156