Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016 and 2015 by segment is as follows (in thousands):

	Steel Mills			Steel Products			Raw Materials		Total
Balance, December 31, 2014	$	594,402		$	744,685		$	729,577	$	2,068,664
Translation		—			(53,618	)		—		(53,618	)
Other		(3,768	)		—			—		(3,768	)
Balance, December 31, 2015		590,634			691,067			729,577		2,011,278
Acquisitions		29,522			—			—		29,522
Translation		—			11,928			—		11,928
Balance, December 31, 2016	$	620,156		$	702,995		$	729,577	$	2,052,728

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):

	December 31, 2016				December 31, 2015
	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Customer relationships	$	1,295,803	$	566,884	$	1,185,299	$	517,817
Trademarks and trade names		161,851		66,494		155,864		57,756
Other		62,807		20,248		23,025		17,943
	$	1,520,461	$	653,626	$	1,364,188	$	593,516