CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net sales
Unrelated parties	$ 1,987,635	$ 1,735,420	$ 3,753,516	$ 3,463,821
Related parties	82,126	65,920	146,327	133,215
Total net sales	2,069,761	1,801,340	3,899,843	3,597,036
Costs of goods sold	1,846,990	1,653,648	3,513,768	3,273,080
Gross profit	222,771	147,692	386,075	323,956
Selling, general and administrative expenses	73,463	65,356	143,505	130,618
Profit sharing	10,469	4,779	15,864	11,422
Amortization of intangible assets	6,934	8,051	13,869	16,178
Impairment charges		308		308
Total selling, general and administrative expenses	90,866	78,494	173,238	158,526
Operating income	131,905	69,198	212,837	165,430
Interest expense, net of capitalized interest	30,050	31,465	60,619	66,094
Other expense (income), net	(1,754)	(1,246)	(2,385)	(2,292)
Income before income taxes	103,609	38,979	154,603	101,628
Income taxes	37,268	15,706	54,564	37,103
Net income	66,341	23,273	100,039	64,525
Net loss attributable to noncontrolling interests	5,962	5,685	10,843	12,648
Net income attributable to Steel Dynamics, Inc.	$ 72,303	$ 28,958	$ 110,882	$ 77,173
Basic earnings per share attributable to Steel Dynamics, Inc. stockholders (in dollars per share)	$ 0.32	$ 0.13	$ 0.49	$ 0.35
Weighted average common shares outstanding (in shares)	226,220	220,471	224,615	220,233
Diluted earnings per share attributable to Steel Dynamics, Inc. stockholders, including the effect of assumed conversions when dilutive (in dollars per share)	$ 0.31	$ 0.13	$ 0.48	$ 0.34
Weighted average common shares and share equivalents outstanding (in shares)	242,048	221,736	241,721	238,246
Dividends declared per share (in dollars per share)	$ 0.115	$ 0.11	$ 0.23	$ 0.22