CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net sales
Total net sales	$ 5,081,630	$ 6,212,878	$ 9,974,836	$ 11,782,780
Costs of goods sold	3,774,772	4,329,536	7,611,856	8,116,925
Gross profit	1,306,858	1,883,342	2,362,980	3,665,855
Selling, general and administrative expenses	141,209	118,377	285,518	270,392
Profit sharing	90,990	139,742	160,565	268,211
Amortization of intangible assets	10,924	7,160	17,802	14,322
Operating income	1,063,735	1,618,063	1,899,095	3,112,930
Interest expense, net of capitalized interest	20,767	25,667	43,274	42,336
Other (income) expense, net	(31,348)	(4,021)	(66,284)	16,447
Income before income taxes	1,074,316	1,596,417	1,922,105	3,054,147
Income tax expense	258,139	381,765	461,595	732,141
Net income	816,177	1,214,652	1,460,510	2,322,006
Net income attributable to noncontrolling interests	(4,070)	(5,098)	(11,093)	(8,521)
Net income attributable to Steel Dynamics, Inc.	$ 812,107	$ 1,209,554	$ 1,449,417	$ 2,313,485
Basic earnings per share attributable to Steel Dynamics, Inc. stockholders (in dollars per share)	$ 4.83	$ 6.49	$ 8.54	$ 12.22
Weighted average common shares outstanding (in shares)	168,009	186,442	169,803	189,300
Diluted earnings per share attributable to Steel Dynamics, Inc. stockholders, including the effect of assumed conversions when dilutive (in dollars per share)	$ 4.81	$ 6.44	$ 8.49	$ 12.14
Weighted average common shares and share equivalents outstanding (in shares)	168,865	187,740	170,672	190,491
Dividends declared per share (in dollars per share)	$ 0.425	$ 0.34	$ 0.85	$ 0.68
Unrelated parties
Net sales
Net Sales	$ 4,930,422	$ 5,964,503	$ 9,675,775	$ 11,375,304
Related Parties
Net sales
Net Sales	$ 151,208	$ 248,375	$ 299,061	$ 407,476