CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net sales
Unrelated parties	$ 2,060,596	$ 1,901,415	$ 5,737,584	$ 5,851,371
Related parties	40,714	49,508	128,929	151,994
Total net sales	2,101,310	1,950,923	5,866,513	6,003,365
Costs of goods sold	1,692,807	1,722,197	4,841,591	5,415,854
Gross profit	408,503	228,726	1,024,922	587,511
Selling, general and administrative expenses	95,185	82,648	279,899	242,207
Profit sharing	22,255	9,008	51,722	18,637
Amortization of intangible assets	7,208	6,041	21,359	18,308
Operating income	283,855	131,029	671,942	308,359
Interest expense, net of capitalized interest	36,199	37,084	109,888	117,334
Other expense, net	4,351	239	741	15,219
Income before income taxes	243,305	93,706	561,313	175,806
Income taxes	88,892	34,839	205,139	64,660
Net income	154,413	58,867	356,174	111,146
Net loss attributable to noncontrolling interests	2,984	1,750	5,929	11,782
Net income attributable to Steel Dynamics, Inc.	$ 157,397	$ 60,617	$ 362,103	$ 122,928
Basic earnings per share attributable to Steel Dynamics, Inc. stockholders	$ 0.65	$ 0.25	$ 1.49	$ 0.51
Weighted average common shares outstanding - basic (in shares)	243,761	242,074	243,539	241,836
Diluted earnings per share attributable to Steel Dynamics, Inc. stockholders, including the effect of assumed conversions when dilutive (in dollars per share)	$ 0.64	$ 0.25	$ 1.48	$ 0.51
Weighted average common shares and share equivalents outstanding (in shares)	245,682	243,822	245,227	243,393
Dividends declared per share (in dollars per share)	$ 0.1400	$ 0.1375	$ 0.4200	$ 0.4125