Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Sales
Sales	$ 1,645,420	$ 1,544,329
Costs and expenses
Materials, labor, and other operating expenses (excluding depreciation)	1,307,439	1,230,635
Depreciation and amortization	35,850	31,186
Selling and distribution expenses	144,110	128,788
General and administrative expenses	25,117	26,463
Other (income) expense, net	(78)	(345)
Total costs and expenses	1,512,438	1,416,727
Income from operations	132,982	127,602
Foreign currency exchange loss	(299)	(73)
Pension expense (excluding service costs)	(37)	(41)
Interest expense	(6,070)	(6,361)
Interest income	10,597	9,685
Change in fair value of interest rate swaps	(220)	(804)
Total nonoperating income (expense)	3,971	2,406
Income before income taxes	136,953	130,008
Income tax provision	(32,829)	(33,275)
Net Income (Loss) Attributable to Parent, Total	$ 104,124	$ 96,733
Weighted average common shares outstanding:
Basic (in shares)	39,608	39,593
Diluted (in shares)	39,956	39,838
Net income per common share:
Basic (in dollars per share)	$ 2.63	$ 2.44
Diluted (in dollars per share)	2.61	2.43
Dividends declared per common share (in dollars per share)	$ 0.20	$ 0.15