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SEGMENT AND RELATED INFORMATION - Financial Information by Business Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues $ 682,122 $ 700,805 $ 697,052
Cost of services provided 532,667 530,287 517,063
Revenues less cost of sales and services 149,455 170,518 179,989
Selling, general and administrative expenses  73,350 72,605 69,962
Depreciation and amortization expense  68,038 75,142 87,214
Other operating expense (income) 6,735 (16,716) 5,795
Operating income 1,332 39,487 17,018
Other income (7,269) 876 (6,286)
Income (loss) before income taxes (5,937) 40,363 10,732
Capital expenditures 26,138 31,633 25,421
Australia      
Segment Reporting Information [Line Items]      
Revenues 426,956 336,763 278,252
Canada      
Segment Reporting Information [Line Items]      
Revenues 245,087 352,795 395,997
Operating segments | Australia      
Segment Reporting Information [Line Items]      
Revenues 426,956 336,763 278,252
Cost of services provided 315,374 243,011 200,944
Revenues less cost of sales and services 111,582 93,752 77,308
Selling, general and administrative expenses  24,712 20,058 17,693
Depreciation and amortization expense  31,044 28,696 30,521
Other operating expense (income) 6,302 16 3,818
Operating income 49,524 44,982 25,276
Capital expenditures 15,703 21,632 12,757
Operating segments | Canada      
Segment Reporting Information [Line Items]      
Revenues 245,087 352,795 395,997
Cost of services provided 207,135 277,067 293,576
Revenues less cost of sales and services 37,952 75,728 102,421
Selling, general and administrative expenses  18,457 20,000 19,073
Depreciation and amortization expense  36,704 46,319 55,503
Other operating expense (income) (2,482) (18,568) 69
Operating income (14,727) 27,977 27,776
Capital expenditures 10,344 9,216 11,588
Corporate, other and eliminations | Corporate, other and eliminations      
Segment Reporting Information [Line Items]      
Revenues 10,079 11,247 22,803
Cost of services provided 10,158 10,209 22,543
Revenues less cost of sales and services (79) 1,038 260
Selling, general and administrative expenses  30,181 32,547 33,196
Depreciation and amortization expense  290 127 1,190
Other operating expense (income) 2,915 1,836 1,908
Operating income (33,465) (33,472) (36,034)
Capital expenditures $ 91 $ 785 $ 1,076