CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net sales
Unrelated parties	$ 1,698,004	$ 2,003,973
Related parties	43,297	43,462
Total net sales	1,741,301	2,047,435
Costs of goods sold	1,505,265	1,860,393
Gross profit	236,036	187,042
Selling, general and administrative expenses	87,530	76,350
Profit sharing	9,291	4,598
Amortization of intangible assets	7,250	6,323
Operating income	131,965	99,771
Interest expense, net of capitalized interest	37,043	43,087
Other (income) expense, net	(1,792)	16,192
Income before income taxes	96,714	40,492
Income tax expense	35,396	13,538
Net income	61,318	26,954
Net loss attributable to noncontrolling interests	1,419	3,807
Net income attributable to Steel Dynamics, Inc.	$ 62,737	$ 30,761
Basic earnings per share attributable to Steel Dynamics, Inc. stockholders	$ 0.26	$ 0.13
Weighted average common shares outstanding - basic (in shares)	243,202	241,535
Diluted earnings per share attributable to Steel Dynamics, Inc. stockholders, including the effect of assumed conversions when dilutive (in dollars per share)	$ 0.26	$ 0.13
Weighted average common shares and share equivalents outstanding (in shares)	244,608	242,867
Dividends declared per share (in dollars per share)	$ 0.1400	$ 0.1375