CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net sales
Unrelated parties	$ 5,410,801	$ 3,537,625
Related parties	159,101	6,972
Total net sales	5,569,902	3,544,597
Costs of goods sold	3,787,389	2,744,331
Gross profit	1,782,513	800,266
Selling, general and administrative expenses	152,015	149,781
Profit sharing	128,469	48,848
Amortization of intangible assets	7,162	7,438
Operating income	1,494,867	594,199
Interest expense, net of capitalized interest	16,669	17,269
Other (income) expense, net	20,468	10,071
Income before income taxes	1,457,730	566,859
Income tax expense	350,376	128,104
Net income	1,107,354	438,755
Net income attributable to noncontrolling interests	(3,423)	(8,248)
Net income attributable to Steel Dynamics, Inc.	$ 1,103,931	$ 430,507
Basic earnings per share attributable to Steel Dynamics, Inc. stockholders (in dollars per share)	$ 5.74	$ 2.04
Weighted average common shares outstanding (in shares)	192,158	211,015
Diluted earnings per share attributable to Steel Dynamics, Inc. stockholders, including the effect of assumed conversions when dilutive (in dollars per share)	$ 5.71	$ 2.03
Weighted average common shares and share equivalents outstanding (in shares)	193,241	212,254
Dividends declared per share (in dollars per share)	$ 0.34	$ 0.26