Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Change in Net Carrying Amount of Goodwill by Segment

The change in the net carrying amount of goodwill for the six months ended June 30, 2018, by segment, was as follows (in thousands):

	Steel Mills			Steel Products			Raw Materials		Total
Balance at December 31, 2017	$	745,484		$	720,997		$	729,577	$	2,196,058
Translation		—			(10,249	)		—		(10,249	)
Reclassifications		(153,498	)		153,498			—		—
Balance at June 30, 2018	$	591,986		$	864,246		$	729,577	$	2,185,809

Schedule of Intangible Assets

Intangible assets with estimated useful lives of five to 22 years are amortized on a straight-line or accelerated basis and were comprised of the following as of June 30, 2018 and December 31, 2017 (in thousands):

	June 30, 2018				December 31, 2017
	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Customer relationships	$	1,418,437	$	677,547	$	1,420,224	$	641,089
Trademarks and trade names		176,089		82,426		176,471		77,208
Other		62,806		29,454		62,805		26,557
	$	1,657,332	$	789,427	$	1,659,500	$	744,854