CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net sales
Unrelated parties	$ 4,745,353	$ 5,410,801
Related parties	147,853	159,101
Total net sales	4,893,206	5,569,902
Costs of goods sold	3,837,084	3,787,389
Gross profit	1,056,122	1,782,513
Selling, general and administrative expenses	144,309	152,015
Profit sharing	69,575	128,469
Amortization of intangible assets	6,878	7,162
Operating income	835,360	1,494,867
Interest expense, net of capitalized interest	22,507	16,669
Other (income) expense, net	(34,936)	20,468
Income before income taxes	847,789	1,457,730
Income tax expense	203,456	350,376
Net income	644,333	1,107,354
Net income attributable to noncontrolling interests	(7,023)	(3,423)
Net income attributable to Steel Dynamics, Inc.	$ 637,310	$ 1,103,931
Basic earnings per share attributable to Steel Dynamics, Inc. stockholders (in dollars per share)	$ 3.71	$ 5.74
Weighted average common shares outstanding (in shares)	171,597	192,158
Diluted earnings per share attributable to Steel Dynamics, Inc. stockholders, including the effect of assumed conversions when dilutive (in dollars per share)	$ 3.70	$ 5.71
Weighted average common shares and share equivalents outstanding (in shares)	172,479	193,241
Dividends declared per share (in dollars per share)	$ 0.425	$ 0.34