CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 3,246,814	$ 570,828	$ 677,900
Other comprehensive income (loss) - net unrealized gain (loss) on cash flow hedging derivatives, net of income tax benefit of $1,247, income tax expense of $594, and income tax benefit of $96 for 2021, 2020 and 2019, respectively	(3,993)	1,909	(308)
Comprehensive income	3,242,821	572,737	677,592
Comprehensive income attributable to noncontrolling interests	(32,748)	(20,006)	(6,797)
Comprehensive income attributable to Steel Dynamics, Inc.	$ 3,210,073	$ 552,731	$ 670,795