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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Percentage
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Revenues    
Revenues (as a percent) 100.00% 100.00%
Cost of revenues    
Labor and other operating expenses (as a percent) 45.10% 42.80%
Depreciation, depletion and amortization (as a percent) 7.40% 6.60%
Total cost of revenues (as a percent) 52.50% 49.40%
Gross profit (as a percent) 47.50% 50.60%
Selling, general, and administrative expenses (as a percent) 6.80% 6.90%
Operating profit (as a percent) 40.70% 43.70%
Other (income) expense, net    
Other (income) expense, net (as a percent) (3.70%) (3.40%)
Income before income tax expense (as a percent) 44.40% 47.10%
Income tax expense (as a percent) 9.60% 9.70%
Net income (as a percent) 34.80% 37.40%