CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Percentage	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues
Revenues (as a percent)	100.00%	100.00%	100.00%	100.00%
Cost of revenues
Labor and other operating expenses (as a percent)	47.50%	46.80%	45.20%	47.90%
Depreciation, depletion and amortization (as a percent)	6.70%	7.70%	6.60%	8.00%
Total cost of revenues (as a percent)	54.20%	54.50%	51.80%	55.90%
Gross profit (as a percent)	45.80%	45.50%	48.20%	44.10%
Selling, general and administrative expenses (as a percent)	6.80%	6.40%	6.80%	6.50%
Operating profit (as a percent)	39.00%	39.10%	41.40%	37.60%
Other (income) expense, net
Other (income) expense, net (as a percent)	(3.40%)	(3.60%)	(3.30%)	(3.60%)
Income before income tax expense (as a percent)	42.40%	42.70%	44.70%	41.20%
Income tax expense (as a percent)	8.70%	8.70%	9.20%	8.50%
Net income (as a percent)	33.70%	34.00%	35.50%	32.70%