Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Sales
Sales	$ 1,713,724	$ 1,834,441	$ 5,156,814	$ 5,193,989
Costs and expenses
Materials, labor, and other operating expenses (excluding depreciation)	1,375,719	1,442,178	4,123,838	4,099,249
Depreciation and amortization	36,861	31,474	107,078	93,382
Selling and distribution expenses	157,522	147,714	451,415	415,707
General and administrative expenses	26,172	27,583	77,232	84,193
Other (income) expense, net	94	(141)	(68)	(1,752)
Total costs and expenses	1,596,368	1,648,808	4,759,495	4,690,779
Income from operations	117,356	185,633	397,319	503,210
Foreign currency exchange gain (loss)	300	(602)	(103)	(355)
Pension expense (excluding service costs)	(37)	(40)	(111)	(122)
Interest expense	(6,082)	(6,351)	(18,257)	(19,051)
Interest income	10,168	13,760	31,308	34,964
Change in fair value of interest rate swaps	(866)	(327)	(1,573)	(798)
Total nonoperating income (expense)	3,483	6,440	11,264	14,638
Income before income taxes	120,839	192,073	408,583	517,848
Income tax provision	(29,801)	(49,005)	(101,129)	(131,727)
Net income	$ 91,038	$ 143,068	$ 307,454	$ 386,121
Weighted average common shares outstanding:
Basic (in shares)	38,848	39,675	39,286	39,648
Diluted (in shares)	39,063	39,983	39,521	39,849
Net income per common share:
Basic (in dollars per share)	$ 2.34	$ 3.61	$ 7.83	$ 9.74
Diluted (in dollars per share)	2.33	3.58	7.78	9.69
Dividends declared per common share (in dollars per share)	$ 5.21	$ 0.20	$ 5.61	$ 3.50