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BUSINESS SEGMENT INFORMATION - Summarized financial information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Revenues:          
Revenues $ 364,153 $ 415,858 $ 741,986 $ 892,526  
Operating income:          
Total operating income 35,468 82,369 67,817 173,026  
Pension settlement charges   911   18,286  
Gain on disposition of assets, net 3,338 3,015 4,552 5,951  
Interest expense (99) (73) (333) (145)  
Interest income 3,343 2,698 6,308 4,553  
Other income, net 732 631 1,499 1,392  
Income before income taxes 39,444 85,625 75,291 178,826  
Depreciation and amortization 32,333 26,203 62,337 50,328  
Capital expenditures     127,799 104,488  
Identifiable assets 1,325,246 1,228,188 1,325,246 1,228,188 $ 1,286,845
Technical Services          
Revenues:          
Revenues 341,484 390,018 697,878 842,009  
Support Services          
Revenues:          
Revenues 22,669 25,840 44,108 50,517  
Corporate expenses          
Operating income:          
Corporate Expense (2,447) (4,672) (6,867) (9,753)  
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]          
Operating income:          
Pension settlement charges   911   18,286  
Gain on disposition of assets, net 3,338 3,015 4,552 5,951  
Depreciation and amortization     38 25  
Capital expenditures     1,662 1,886  
Identifiable assets 329,453 286,379 329,453 286,379  
Operating segments          
Revenues:          
Revenues 364,153 415,858 741,986 892,526  
Operating income:          
Total operating income 35,468 82,369 67,817 173,026  
Interest expense (99) (73) (333) (145)  
Interest income 3,343 2,698 6,308 4,553  
Other income, net 732 631 1,499 1,392  
Income before income taxes 39,444 85,625 75,291 178,826  
Operating segments | Technical Services          
Revenues:          
Revenues 341,484 390,018 697,878 842,009  
Operating income:          
Total operating income 30,198 77,017 62,154 180,550  
Depreciation and amortization     56,522 45,580  
Capital expenditures     115,217 97,317  
Identifiable assets 914,418 853,837 914,418 853,837  
Operating segments | Support Services          
Revenues:          
Revenues 22,669 25,840 44,108 50,517  
Operating income:          
Total operating income 4,379 7,920 7,978 14,564  
Depreciation and amortization     5,777 4,723  
Capital expenditures     10,920 5,285  
Identifiable assets $ 81,375 $ 87,972 $ 81,375 $ 87,972