Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Operating revenues	$ 986,820	$ 760,985	$ 2,734,915	$ 2,090,047
Cost of sales	862,598	671,085	2,398,331	1,836,853
Gross profit	124,222	89,900	336,584	253,194
Selling, general and administrative expenses	51,841	36,191	140,712	109,292
Operating income	72,381	53,709	195,872	143,902
Interest income	1,369	0	2,858	0
Interest expense	5,441	2,851	16,437	8,823
Other income, net	3,745	1,071	6,220	3,683
Income before income taxes and income from equity method investments	72,054	51,929	188,513	138,762
Income taxes	20,617	13,995	53,598	37,606
Income from equity method investments	5,540	3,833	11,577	7,797
Net income	$ 56,977	$ 41,767	$ 146,492	$ 108,953
Earnings per share:
Basic (in dollars per share)	$ 1.12	$ 0.82	$ 2.87	$ 2.14
Diluted (in dollars per share)	$ 1.11	$ 0.82	$ 2.87	$ 2.14
Weighted average common shares outstanding:
Basic (in shares)	51,048	50,972	51,044	50,972
Diluted (in shares)	51,137	50,972	51,107	50,972