CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Total net sales	$ 4,694,003	$ 4,893,206
Costs of goods sold	3,713,205	3,837,084
Gross profit	980,798	1,056,122
Selling, general and administrative expenses	159,507	144,309
Profit sharing	62,652	69,575
Amortization of intangible assets	7,664	6,878
Operating income	750,975	835,360
Interest expense, net of capitalized interest	11,978	22,507
Other (income) expense, net	(26,784)	(34,936)
Income before income taxes	765,781	847,789
Income tax expense	178,281	203,456
Net income	587,500	644,333
Net income attributable to noncontrolling interests	(3,459)	(7,023)
Net income attributable to Steel Dynamics, Inc.	$ 584,041	$ 637,310
Basic earnings per share attributable to Steel Dynamics, Inc. stockholders (in dollars per share)	$ 3.68	$ 3.71
Weighted average common shares outstanding (in shares)	158,666	171,597
Diluted earnings per share attributable to Steel Dynamics, Inc. stockholders, including the effect of assumed conversions when dilutive (in dollars per share)	$ 3.67	$ 3.70
Weighted average common shares and share equivalents outstanding (in shares)	159,354	172,479
Dividends declared per share (in dollars per share)	$ 0.46	$ 0.425
Unrelated parties
Total net sales	$ 4,496,819	$ 4,745,353
Related Parties
Total net sales	$ 197,184	$ 147,853