CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net sales
Unrelated parties	$ 1,765,881	$ 1,728,401
Related parties	64,201	67,295
Total net sales	1,830,082	1,795,696
Costs of goods sold	1,666,778	1,619,432
Gross profit	163,304	176,264
Selling, general and administrative expenses	70,042	65,262
Profit sharing	5,395	6,643
Amortization of intangible assets	6,935	8,127
Total selling, general and administrative expenses	82,372	80,032
Operating income	80,932	96,232
Interest expense, net of capitalized interest	30,569	34,629
Other expense (income), net	(631)	(1,046)
Income before income taxes	50,994	62,649
Income taxes	17,296	21,397
Net income	33,698	41,252
Net loss attributable to noncontrolling interests	4,881	6,963
Net income attributable to Steel Dynamics, Inc.	$ 38,579	$ 48,215
Basic earnings per share attributable to Steel Dynamics, Inc. stockholders (in dollars per share)	$ 0.17	$ 0.22
Weighted average common shares outstanding (in shares)	223,011	219,995
Diluted earnings per share attributable to Steel Dynamics, Inc. stockholders, including the effect of assumed conversions when dilutive (in dollars per share)	$ 0.17	$ 0.21
Weighted average common shares and share equivalents outstanding (in shares)	241,394	238,087
Dividends declared per share (in dollars per share)	$ 0.115	$ 0.11