Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in carrying amounts of goodwill by segment

The following table reflects the changes in carrying amounts of goodwill by segment for the three months endedMarch 31, 2018:

(In thousands)	Harsco Metals  & Minerals Segment		Harsco Industrial Segment		Harsco Rail Segment		Consolidated Totals
Balance at December 31, 2017	$	381,893	$	6,839	$	13,026	$	401,758
Foreign currency translation	4,948		—		—		4,948
Balance at March 31, 2018	$	386,841	$	6,839	$	13,026	$	406,706

Schedule of intangible assets by class

Intangible assets included in the caption, Intangible assets, net, on the Condensed Consolidated Balance Sheets consist of the following:

	March 31, 2018				December 31, 2017
(In thousands)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Customer related	$	154,949	$	123,676	$	153,014	$	121,385
Patents	5,874		5,752		5,825		5,700
Technology related	26,035		26,035		26,131		26,131
Trade names	8,316		4,921		8,317		4,845
Other	8,966		6,000		8,875		5,850
Total	$	204,140	$	166,384	$	202,162	$	163,911

Schedule of amortization expense

Amortization expense for intangible assets was as follows:

	Three Months Ended
	March 31
(In thousands)	2018		2017
Amortization expense for intangible assets	$	1,282	$	1,318

Schedule of estimated amortization expense

The estimated amortization expense for the next five fiscal years based on current intangible assets is as follows:

(In thousands)	2018		2019		2020		2021		2022
Estimated amortization expense (a)	$	5,000	$	4,750	$	4,500	$	4,250	$	4,000

(a) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange fluctuations.