Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 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 years ended December 31, 2018 and 2017 by segment is as follows:

	(in thousands)
	Steel Mills			Steel Products			Raw Materials		Total
Balance, December 31, 2016	$	620,156		$	702,995		$	729,577	$	2,052,728
Acquisitions		125,328			7,004			—		132,332
Translation		—			10,998			—		10,998
Balance, December 31, 2017		745,484			720,997			729,577		2,196,058
Reclassifications		(153,498	)		153,498			—		—
Translation		—			(11,722	)		—		(11,722	)
Balance, December 31, 2018	$	591,986		$	862,773		$	729,577	$	2,184,336

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 are comprised of the following:

	(in thousands)
	December 31, 2018				December 31, 2017
	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Customer relationships	$	1,418,250	$	713,656	$	1,420,224	$	641,089
Trademarks and trade names		176,046		87,680		176,471		77,208
Other		67,820		32,276		62,805		26,557
	$	1,662,116	$	833,612	$	1,659,500	$	744,854