Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Apr. 01, 2017

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 three months ended April 1, 2017 by segment is as follows (in thousands):

	Steel Mills		Steel Products			Raw Materials		Total
Balance at December 31, 2016	$	620,156	$	702,995		$	729,577	$	2,052,728
Acquisitions		125,293		—			—		125,293
Translation		—		(745	)		—		(745	)
Balance at April 1, 2017	$	745,449	$	702,250		$	729,577	$	2,177,276

Schedule of Intangible Assets

Intangible assets with estimated useful lives of 5 to 22 years are amortized on a straight-line or accelerated basis and are comprised of the following (in thousands):

	April 1, 2017				December 31, 2016
	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Customer relationships	$	1,408,658	$	584,962	$	1,295,803	$	566,884
Trademarks and trade names		174,021		69,149		161,851		66,494
Other		62,807		21,883		62,807		20,248
	$	1,645,486	$	675,994	$	1,520,461	$	653,626