Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Operating revenues	$ 921,466	$ 703,373	$ 1,748,095	$ 1,329,062
Cost of sales	801,597	614,796	1,535,733	1,165,768
Gross profit	119,869	88,577	212,362	163,294
Selling, general and administrative expenses	47,362	37,268	88,871	73,101
Operating income	72,507	51,309	123,491	90,193
Interest expense, net	4,813	3,246	9,507	5,972
Other income, net	1,908	1,694	2,475	2,612
Income before income taxes and income from equity method investments	69,602	49,757	116,459	86,833
Income taxes	19,408	13,634	32,981	23,611
Income from equity method investments	2,649	2,849	6,037	3,964
Net income	$ 52,843	$ 38,972	$ 89,515	$ 67,186
Earnings per share:
Basic (in dollars per share)	$ 1.04	$ 0.76	$ 1.75	$ 1.32
Diluted (in dollars per share)	$ 1.03	$ 0.76	$ 1.75	$ 1.32
Weighted average common shares outstanding:
Basic (in shares)	51,041	50,972	51,042	50,972
Diluted (in shares)	51,094	50,972	51,092	50,972