Enviri (NVRI) 10-Q 2 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 31, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	HARSCO CORP
Entity Central Index Key	45,876
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		80,846,067

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 64,422	$ 62,098
Restricted cash	2,665	4,111
Trade accounts receivable, net	295,390	288,034
Other receivables	27,349	20,224
Inventories	130,871	178,293
Current portion of contract assets	18,798	0
Other current assets	44,562	39,332
Total current assets	584,057	592,092
Property, plant and equipment, net	461,906	479,747
Goodwill	413,837	401,758
Intangible assets, net	86,265	38,251
Contract assets	3,566	0
Deferred income tax assets	42,387	51,574
Other assets	19,394	15,263
Total assets	1,611,412	1,578,685
Current liabilities:
Short-term borrowings	5,349	8,621
Current maturities of long-term debt	8,218	11,208
Accounts payable	137,491	126,249
Accrued compensation	43,133	60,451
Income taxes payable	5,707	5,106
Insurance liabilities	11,272	11,167
Current portion of advances on contracts	39,559	117,958
Other current liabilities	130,577	133,368
Total current liabilities	381,306	474,128
Long-term debt	652,431	566,794
Insurance liabilities	21,145	22,385
Retirement plan liabilities	228,063	259,367
Advances on contracts	13,493	0
Other liabilities	48,821	40,846
Total liabilities	1,345,259	1,363,520
COMMITMENTS AND CONTINGENCIES
HARSCO CORPORATION STOCKHOLDERS' EQUITY
Preferred stock	0	0
Common stock	141,812	141,110
Additional paid-in capital	185,512	180,201
Accumulated other comprehensive loss	(557,889)	(546,582)
Retained earnings	1,219,992	1,157,801
Treasury stock	(765,695)	(762,079)
Total Harsco Corporation stockholders' equity	223,732	170,451
Noncontrolling interests	42,421	44,714
Total equity	266,153	215,165
Total liabilities and equity	$ 1,611,412	$ 1,578,685

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Revenues from continuing operations:
Total revenues	$ 431,972	$ 394,898		$ 840,010	$ 767,439
Costs and expenses from continuing operations:
Selling, general and administrative costs	58,927	54,385		116,010	108,322
Research and development expenses	1,418	1,329		2,657	2,160
Other (income) expenses, net	(880)	2,072		942	2,966
Total costs and expenses	378,347	351,749		749,844	695,683
Operating income from continuing operations	53,625	43,149		90,166	71,756
Interest income	577	493		1,075	1,005
Interest expense	(9,993)	(12,405)		(19,576)	(24,058)
Defined benefit pension income (expense)	904	(675)		1,743	(1,374)
Gain (Loss) on Extinguishment of Debt	(1,034)	0		(1,034)	0
Income from continuing operations before income taxes	44,079	30,562		72,374	47,329
Income tax expense	(1,944)	(11,234)		(10,210)	(17,487)
Income from continuing operations	42,135	19,328		62,164	29,842
Discontinued operations:
Income on disposal of discontinued business	739	628		159	40
Income tax expense related to discontinued business	(163)	(225)		(35)	(14)
Income from discontinued operations, net of tax	576	403		124	26
Net income	42,711	19,731		62,288	29,868
Less: Net income attributable to noncontrolling interests	(2,222)	(693)		(3,991)	(1,940)
Net income attributable to Harsco Corporation	40,489	19,038		58,297	27,928
Amounts attributable to Harsco Corporation common stockholders:
Income from continuing operations, net of tax	39,913	18,635		58,173	27,902
Income from discontinued operations, net of tax	576	403		124	26
Net income attributable to Harsco Corporation	$ 40,489	$ 19,038		$ 58,297	$ 27,928
Weighted-average shares of common stock outstanding (in shares)	80,861	80,535		80,756	80,460
Basic earnings per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ 0.49	$ 0.23		$ 0.72	$ 0.35
Discontinued operations (in dollars per share)	0.01	0.01		0	0
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ 0.50	$ 0.24		$ 0.72	$ 0.35
Diluted weighted-average shares of common stock outstanding (in shares)	83,643	82,850		83,594	82,558
Diluted earnings per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ 0.48	$ 0.22		$ 0.70	$ 0.34
Discontinued operations (in dollars per share)	0.01	0		0	0
Diluted earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ 0.48	$ 0.23	[1]	$ 0.70	$ 0.34
Service Revenues [Member]
Revenues from continuing operations:
Total revenues	$ 257,963	$ 251,306		$ 512,925	$ 491,915
Costs and expenses from continuing operations:
Cost of services and products sold	195,906	193,235		395,279	382,717
Product Revenues [Member]
Revenues from continuing operations:
Total revenues	174,009	143,592		327,085	275,524
Costs and expenses from continuing operations:
Cost of services and products sold	$ 122,976	$ 100,728		$ 234,956	$ 199,518
[1]	Does not total due to rounding

CONDENSED CONSOLIDATED STATEME4

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 42,711	$ 19,731	$ 62,288	$ 29,868
Other comprehensive income (loss):
Foreign currency translation adjustments, net of deferred income taxes of $(2,579) and $1,458, and $(952) and $1,851 for the three and six months ended June 30, 2018 and 2017, respectively	(48,706)	9,825	(36,205)	26,386
Net gain (loss) on cash flow hedging instruments, net of deferred income taxes of $(1,046) and $611, and $(1,885) and $867 for the three and six months ended June 30, 2018 and 2017, respectively	2,902	(341)	5,579	(728)
Pension liability adjustments, net of deferred income taxes of $(288) and $(522), and $(613) and $(1,044) for the three and six months ended June 30, 2018 and 2017, respectively	28,627	(10,348)	19,626	(9,143)
Unrealized gain (loss) on marketable securities, net of deferred income taxes of $4 and $-, and $8 and $(3) for the three and six months June 30, 2018 and 2017, respectively	(13)	0	(27)	6
Total other comprehensive loss	(17,190)	(864)	(11,027)	16,521
Total comprehensive income	25,521	18,867	51,261	46,389
Less: Comprehensive (income) loss attributable to noncontrolling interests	296	(1,841)	(2,751)	(3,474)
Comprehensive income attributable to Harsco Corporation	$ 25,817	$ 17,026	$ 48,510	$ 42,915

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, deferred income taxes	$ (2,579)	$ 1,458	$ (952)	$ 1,851
Net gain (loss) on cash flow hedging instruments, deferred income taxes	(1,046)	611	(1,885)	867
Pension liability adjustments, deferred income taxes	(288)	(522)	(613)	(1,044)
Unrealized gain (loss) on marketable securities, deferred income taxes	$ 4	$ 0	$ 8	$ (3)

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 62,288	$ 29,868
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	62,005	60,495
Amortization	4,566	4,008
Deferred income tax expense	340	3,433
Dividends from unconsolidated entities	0	19
Other, net	3,037	5,708
Changes in assets and liabilities:
Accounts receivable	(21,445)	(42,806)
Inventories	(11,175)	(6,296)
Contract assets	(1,393)	0
Accounts payable	7,359	4,259
Accrued interest payable	(58)	166
Accrued compensation	(16,045)	(4,365)
Advances on contracts	(13,116)	(1,479)
Retirement plan liabilities, net	(18,330)	(11,221)
Other assets and liabilities	(11,334)	4,990
Net cash provided by operating activities	46,699	46,779
Cash flows from investing activities:
Purchases of property, plant and equipment	(56,496)	(40,700)
Purchases of businesses, net of cash acquired	56,389	0
Proceeds from sales of assets	3,153	1,534
Net proceeds (payments) from settlement of foreign currency forward exchange contracts	2,942	(4,170)
Net cash used by investing activities	(112,674)	(34,996)
Cash flows from financing activities:
Short-term borrowings, net	(2,977)	2,302
Current maturities and long-term debt:
Additions	124,858	24,000
Reductions	(43,193)	(46,712)
Dividends paid to noncontrolling interests	(4,609)	(1,769)
Sale of noncontrolling interests	477	0
Stock-based compensation - Employee taxes paid	(3,614)	(1,326)
Deferred financing costs	(354)	(42)
Other financing activities, net	0	(368)
Net cash provided (used) by financing activities	70,588	(23,915)
Effect of exchange rate changes on cash and cash equivalents, including restricted cash	(3,735)	3,029
Net increase (decrease) in cash and cash equivalents, including restricted cash	878	(9,103)
Cash and cash equivalents, including restricted cash, at beginning of period	66,209	71,879
Cash and cash equivalents, including restricted cash, at end of period	$ 67,087	$ 62,776

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock Issued	Common Stock Treasury	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balances at Dec. 31, 2016	$ 137,563	$ 140,625	$ (760,391)	$ 172,101	$ 1,150,688	$ (606,722)	$ 41,262
Increase (Decrease) in Stockholders' Equity
Net income	29,868				27,928		1,940
Cash dividends declared:	(1,769)						(1,769)
Total other comprehensive income (loss), net of deferred income taxes of $(3,442) and $1,671 in 2018 and 2017, respectively	16,521					14,987	1,534
Stock Appreciation Rights exercised, net 22,584 shares and 7,441 shares in 2018 and 2017, respectively	(49)	13	(49)	(13)
Vesting of restricted stock units and other stock grants, net 369,498 shares and 236,335 shares in 2018 and 2017, respectively	(1,277)	401	(1,277)	(401)
Amortization of unearned portion of stock-based compensation, net of forfeitures	5,642			5,642
Balances at Jun. 30, 2017	186,896	141,039	(761,717)	178,435	1,177,907	(591,735)	42,967
Increase (Decrease) in Stockholders' Equity
Adoption of new accounting standards (See Note 2)	397			1,106	(709)
Net income	19,731
Total other comprehensive income (loss), net of deferred income taxes of $(3,442) and $1,671 in 2018 and 2017, respectively	(864)
Balances at Jun. 30, 2017	186,896	141,039	(761,717)	178,435	1,177,907	(591,735)	42,967
Balances at Dec. 31, 2017	215,165	141,110	(762,079)	180,201	1,157,801	(546,582)	44,714
Increase (Decrease) in Stockholders' Equity
Net income	62,288				58,297		3,991
Cash dividends declared:	(5,521)						(5,521)
Sale of subsidiary shares to noncontrolling interest	477						477
Total other comprehensive income (loss), net of deferred income taxes of $(3,442) and $1,671 in 2018 and 2017, respectively	(11,027)					(9,787)	(1,240)
Stock Appreciation Rights exercised, net 22,584 shares and 7,441 shares in 2018 and 2017, respectively	(201)	39	(201)	(39)
Vesting of restricted stock units and other stock grants, net 369,498 shares and 236,335 shares in 2018 and 2017, respectively	(3,415)	663	(3,415)	(663)
Amortization of unearned portion of stock-based compensation, net of forfeitures	6,013			6,013
Balances at Jun. 30, 2018	266,153	141,812	(765,695)	185,512	1,219,992	(557,889)	42,421
Increase (Decrease) in Stockholders' Equity
Adoption of new accounting standards (See Note 2)	2,374				3,894	(1,520)
Net income	42,711
Total other comprehensive income (loss), net of deferred income taxes of $(3,442) and $1,671 in 2018 and 2017, respectively	(17,190)
Balances at Jun. 30, 2018	$ 266,153	$ 141,812	$ (765,695)	$ 185,512	1,219,992	$ (557,889)	$ 42,421
Increase (Decrease) in Stockholders' Equity
Adoption of new accounting standards (See Note 2)					$ 100

CONDENSED CONSOLIDATED STATEME8

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Other Comprehensive Income (Loss), Tax	$ (3,442)	$ 1,671
Vesting of restricted stock units and other (in shares)	369,498	236,335
Stock Appreciation Rights exercise (in shares)	22,584	7,441

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Harsco Corporation (the "Company") has prepared these unaudited condensed consolidated financial statements in accordance with accounting principles generally accepted in the U.S. (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (the “SEC”). Accordingly, the unaudited condensed consolidated financial statements do not include all of the information and disclosure required by U.S. GAAP for annual financial statements. The December 31, 2017 Condensed Consolidated Balance Sheet information contained in this Quarterly Report on Form 10-Q was derived from the 2017 audited consolidated financial statements. The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements, including the notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . In the opinion of management, all adjustments (all of which are of a normal recurring nature) that are necessary for a fair statement are reflected in the unaudited condensed consolidated financial statements. Operating results and cash flows for the three and six months ended June 30, 2018 are not indicative of the results that may be expected for the year ending December 31, 2018 . Reclassifications Certain reclassifications have been made to prior year amounts to conform with current year classifications.

Recently Adopted and Recently I

Recently Adopted and Recently Issued Accounting Standards	6 Months Ended
	Jun. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted and Recently Issued Accounting Standards The following accounting standards have been adopted in 2018: On January 1, 2018, the Company adopted changes, with subsequent amendments, issued by the Financial Accounting Standards Board ("FASB") related to the recognition of revenue from contracts with customers. The changes clarify the principles for recognizing revenue and develop a common revenue standard. The core principle of the changes is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The adoption of these changes resulted in the following modifications to the Company's revenue recognition process: • Harsco Industrial Segment - The timing of revenue recognition for air-cooled heat exchanger sales, which the Company historically recognized upon the completion of the efforts associated with these arrangements, is now recognized over time with the impact of increasing revenue in earlier periods. This change also impacted the Company's Condensed Consolidated Balance Sheets by decreasing both Inventories and Advances on contracts; and creating a new caption and establishing a balance related to Contract assets. • Harsco Rail Segment - The timing of revenue recognition for certain railway track maintenance equipment sales, which the Company historically recognized upon the completion of the efforts associated with these arrangements, is now recognized over time with the impact of increasing revenue in earlier periods. This change also impacted the Company's Condensed Consolidated Balance Sheets by decreasing both Inventories and Advances on contracts; and creating a new caption and establishing a balance related to Contract assets. In addition, certain advance payments received from customers, which provide a significant benefit of financing and are expected to be outstanding longer than twelve months, are treated as significant financing components to the related transactions and the Company will increase the overall transaction price with a corresponding increase in interest expense. Additionally, the Company's disclosure related to revenue recognition has been expanded in accordance with the FASB changes. Please refer to Note 14, Revenue Recognition for additional information. The Company chose to implement the impact of the FASB changes utilizing the modified retrospective transition method, using the following practical expedients: • The Company has elected to apply the changes only to revenue arrangements that were not completed as of January 1, 2018; and • The Company has elected to reflect the aggregate effect of all contract modifications that occurred prior to the beginning of the earliest reported period when (i) identifying the satisfied and unsatisfied performance obligations; (ii) determining the transaction price; and (iii) allocating the transaction price to the satisfied and unsatisfied performance obligations. Comparative information has not been restated and continues to be reported under U.S. GAAP in effect for those periods. The cumulative effect of the changes made to the Condensed Consolidated Balance Sheet at January 1, 2018 was as follows: (In thousands) Balance at December 31, 2017 Impact of Adoption Balance at January 1, 2018 ASSETS Current assets: Trade accounts receivable, net $ 288,034 $ 532 $ 288,566 Inventories 178,293 (59,793 ) 118,500 Current portion of contract assets — 18,248 18,248 Other current assets 39,332 179 39,511 Total current assets 592,092 (40,834 ) 551,258 Contract assets — 3,566 3,566 Other assets 15,263 1,337 16,600 Total assets 1,578,685 (35,931 ) 1,542,754 LIABILITIES Current liabilities: Current portion of advances on contracts 117,958 (78,507 ) 39,451 Other current liabilities 133,368 13,995 147,363 Total current liabilities 474,128 (64,512 ) 409,616 Advances on contracts — 24,564 24,564 Other liabilities 40,846 1,580 42,426 Total liabilities 1,363,520 (38,368 ) 1,325,152 HARSCO CORPORATION STOCKHOLDERS' EQUITY Accumulated other comprehensive loss (546,582 ) (1,520 ) (548,102 ) Retained earnings 1,157,801 3,957 1,161,758 Total Harsco Corporation stockholders' equity 170,451 2,437 172,888 Total equity 215,165 2,437 217,602 Total liabilities and equity 1,578,685 (35,931 ) 1,542,754 The impact of modifying the Company's Condensed Consolidated Balance Sheet at June 30, 2018 is as follows: June 30, 2018 (In thousands) As Reported Impact of Adoption As Reported - Less Impact of Adoption ASSETS Current assets: Trade accounts receivable, net $ 295,390 $ 271 $ 295,661 Inventories 130,871 78,533 209,404 Current portion of contract assets 18,798 (18,798 ) — Other current assets 44,562 (174 ) 44,388 Total current assets 584,057 59,832 643,889 Contract assets 3,566 (3,566 ) — Deferred income tax assets 42,387 959 43,346 Other assets 19,394 (1,231 ) 18,163 Total assets 1,611,412 55,994 1,667,406 June 30, 2018 (In thousands) As Reported Impact of Adoption As Reported - Less Impact of Adoption LIABILITIES Current liabilities: Current portion of advances on contracts 39,559 79,991 119,550 Other current liabilities 130,577 (8,727 ) 121,850 Total current liabilities 381,306 71,264 452,570 Advances on contracts 13,493 (13,493 ) — Other liabilities 48,821 (301 ) 48,520 Total liabilities 1,345,259 57,470 1,402,729 HARSCO CORPORATION STOCKHOLDERS' EQUITY Accumulated other comprehensive loss (557,889 ) 1,623 (556,266 ) Retained earnings 1,219,992 (3,079 ) 1,216,913 Total Harsco Corporation stockholders' equity 223,732 (1,456 ) 222,276 Noncontrolling interests 42,421 (20 ) 42,401 Total equity 266,153 (1,476 ) 264,677 Total liabilities and equity 1,611,412 55,994 1,667,406 The impact of modifying the Company's Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2018 are as follows: Three Months Ended June 30, 2018 (In thousands, except per share amounts) As Reported Impact of Adoption As Reported - Less Impact of Adoption Revenues from continuing operations: Services revenues $ 257,963 $ 2,321 $ 260,284 Product revenues 174,009 (8,406 ) 165,603 Total revenues 431,972 (6,085 ) 425,887 Costs and expenses from continuing operations: Costs of services sold 195,906 1,349 197,255 Costs of products sold 122,976 (8,182 ) 114,794 Selling, general and administrative costs 58,927 21 58,948 Total costs and expenses 378,347 (6,812 ) 371,535 Operating income from continuing operations 53,625 727 54,352 Interest expense (9,993 ) 451 (9,542 ) Income from continuing operations before income taxes 44,079 1,178 45,257 Income tax expense (1,944 ) 12 (1,932 ) Income from continuing operations 42,135 1,190 43,325 Net income 42,711 1,190 43,901 Less: Net income attributable to noncontrolling interests (2,222 ) 2 (2,220 ) Net income attributable to Harsco Corporation 40,489 1,192 41,681 Amounts attributable to Harsco Corporation common stockholders: Income from continuing operations, net of tax 39,913 1,192 41,105 Net income attributable to Harsco Corporation common stockholders 40,489 1,192 41,681 Basic earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.49 0.01 0.50 Basic earnings per share attributable to Harsco Corporation common stockholders 0.50 0.01 0.51 Diluted earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.48 0.01 0.49 Diluted earnings per share attributable to Harsco Corporation common stockholders 0.48 0.01 0.49 Six Months Ended June 30, 2018 (In thousands, except per share amounts) As Reported Impact of Adoption As Reported - Less Impact of Adoption Revenues from continuing operations: Services revenues $ 512,925 $ 3,671 $ 516,596 Product revenues 327,085 (18,858 ) 308,227 Total revenues 840,010 (15,187 ) 824,823 Costs and expenses from continuing operations: Costs of services sold 395,279 2,707 397,986 Costs of products sold 234,956 (18,112 ) 216,844 Selling, general and administrative costs 116,010 37 116,047 Total costs and expenses 749,844 (15,368 ) 734,476 Operating income from continuing operations 90,166 181 90,347 Interest expense (19,576 ) 903 (18,673 ) Income from continuing operations before income taxes 72,374 1,084 73,458 Income tax expense (10,210 ) 4 (10,206 ) Income from continuing operations 62,164 1,088 63,252 Net income 62,288 1,088 63,376 Less: Net income attributable to noncontrolling interests (3,991 ) 2 (3,989 ) Net income attributable to Harsco Corporation 58,297 1,090 59,387 Amounts attributable to Harsco Corporation common stockholders: Income from continuing operations, net of tax 58,173 1,090 59,263 Net income attributable to Harsco Corporation common stockholders 58,297 1,090 59,387 Basic earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.72 0.01 0.73 Basic earnings per share attributable to Harsco Corporation common stockholders 0.72 0.01 0.73 Diluted earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.70 0.01 0.71 Diluted earnings per share attributable to Harsco Corporation common stockholders 0.70 0.01 0.71 The impact of modifying the Company's Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2018 is as follows: Six Months Ended June 30, 2018 (In thousands) As Reported Impact of Adoption As Reported - Less Impact of Adoption Cash flows from operating activities: Net income $ 62,288 $ 1,088 $ 63,376 Adjustments to reconcile net income to net cash used by operating activities: Deferred income tax expense (benefit) 340 (4 ) 336 Changes in assets and liabilities: Accounts receivable (21,445 ) (797 ) (22,242 ) Inventories (11,175 ) (22,661 ) (33,836 ) Contract assets (1,393 ) 1,393 — Advances on contracts (13,116 ) 15,966 2,850 Other assets and liabilities (11,334 ) 5,015 (6,319 ) Net cash used by operating activities 46,699 — 46,699 On January 1, 2018, the Company adopted changes issued by the FASB related to how employers that sponsor defined benefit pension plans and other postretirement plans present the net periodic pension cost ("NPPC") in the statement of operations. Employers are required to report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. Other components of NPPC are required to be presented in the statement of operations separately from the service cost component and outside of the subtotal of income from operations. The changes also allow only the service cost component to be eligible for capitalization. The adoption of these changes resulted in the Company reclassifying $0.7 million and $1.4 million of NPPC expense for the three months and six months ended June 30, 2017, respectively, from the captions Cost of services sold; Cost of products sold; and Selling, general and administrative expenses to the new caption, Defined benefit pension income (expense) in the Company's Condensed Consolidated Statements of Operations. On January 1, 2018, the Company adopted changes issued by the FASB clarifying when revisions to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The changes require modification accounting only in circumstances when the terms or conditions result in changes to the fair value, vesting conditions or classification of the award as an equity instrument or a liability. The adoption of these changes did not have an impact on the Company's condensed consolidated financial statements. On January 1, 2018, the Company adopted changes issued by FASB which eliminate the requirement to defer the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. Under the new guidance, an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The changes resulted in an adjustment to opening retained earnings of less than $0.1 million . The following accounting standards have been issued and become effective for the Company at a future date: In February 2016, the FASB issued changes in accounting for leases, which become effective for the Company on January 1, 2019. The changes introduce a lessee model that brings most leases onto the balance sheet, which will result in an increase in lease-related assets and liabilities. The changes also align many of the underlying principles of the new lessor model with those in the FASB’s new revenue recognition standard. Furthermore, the changes address other concerns related to the current leases model such as eliminating the requirement in current guidance for an entity to use bright-line tests in determining lease classification. The changes also require lessors to increase the transparency of their exposure to changes in value of their residual assets and how they manage that exposure. The Company is currently assessing existing leasing agreements, evaluating the practical expedients available upon adoption and assessing the impact of the changes on current accounting policies. In addition, the Company is in the process of identifying changes to current business processes and internal controls to support the reporting and disclosure requirements of the new standard. The impact on the consolidation financial statements is currently being evaluated. In January 2017, the FASB issued changes that remove the second step of the annual goodwill impairment test, which requires a hypothetical purchase price allocation. The changes provide that the amount of goodwill impairment will be equal to the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance remains largely unchanged. The same one-step impairment test will be applied to goodwill at all reporting units, even those with zero or negative carrying amounts. Entities will be required to disclose the amount of goodwill at reporting units with zero or negative carrying amounts. The changes become effective for the Company on January 1, 2020. Management has determined that these changes will not have a material impact on the Company's condensed consolidated financial statements. However, should the Company be required to record a goodwill impairment charge in future periods, the amount recorded may differ compared to any amounts that might be recorded under current practice. In August 2017, the FASB issued changes which expand and refine hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedged items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. The amendments in this update should be applied to hedging relationships existing on the date of adoption, which includes a cumulative-effect adjustment to eliminate any ineffectiveness recorded to accumulated other comprehensive income or loss with a corresponding adjustment to the opening balance of retained earnings as of the beginning of the fiscal year in which adoption occurred. Presentation and disclosure amendments are required to be applied prospectively. The changes become effective for the Company on January 1, 2019. Management is currently evaluating the impact of these changes on its condensed consolidated financial statements. In February 2018, the FASB issued changes which allow entities to reclassify stranded income tax effects resulting from the Tax Cuts and Jobs Act (the “Act”) from accumulated other comprehensive income to retained earnings in their consolidated financial statements. Under the Act, deferred taxes were adjusted to reflect the reduction of the historical corporate income tax rate to the newly enacted corporate income tax rate, which left the tax effects on items within accumulated other comprehensive income stranded at historical tax rates. The changes become effective for the Company on January 1, 2019. The Company had approximately $21 million of stranded income tax effects in accumulated other comprehensive income at December 31, 2017 resulting from the Act which the Company plans to reclassify upon initial adoption of these changes.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Acquisitions	Acquisitions In May 2018, the Company acquired Altek Europe Holdings Limited and its affiliated entities (collectively, "Altek"), a U.K.-based manufacturer of market leading products that enable aluminum producers and recyclers to manage and efficiently extract value from critical waste streams, reduce waste generation, and improve operating productivity. The Company acquired Altek, on a debt and cash free basis, for a purchase price of £45 million (approximately $60 million ) in cash, with the potential for up to £25 million (approximately $33 million ) in additional contingent consideration through 2021 subject to the future financial performance of Altek. The preliminary purchase price included an upfront payment of $60.1 million , subject to working capital adjustments and net of cash acquired, as well as contingent consideration with an estimated preliminary fair value of $10.1 million as of the acquisition date. Altek's revenues and operating results have been included in the results of the Harsco Metals & Minerals Segment and were not material to the Company's consolidated results for the three months ended June 30, 2018. The Company incurred approximately $1 million of costs associated with the Altek acquisition in the caption Selling, general and administrative expenses in the Condensed Consolidated Statements of Operations. The fair value recorded for the assets acquired and liabilities assumed for Altek is as follows: Preliminary Valuation (In millions) May 29, 2018 Cash and cash equivalents $ 1.7 Net working capital (1.5 ) Property, plant and equipment 3.3 Intangible assets 52.5 Goodwill 20.9 Net deferred tax liabilities (8.5 ) Other liabilities (0.3 ) Total identifiable net assets of Altek $ 68.2 The goodwill is attributable to strategic benefits, including enhanced operational and financial scale and product and market diversification that the Company expects to realize. The Company expects less than $1.0 million of goodwill to be deductible for income tax purposes. The following table details the preliminary valuation of identifiable intangible assets and amortization periods for the Altek Amortization Period Preliminary Valuation (Dollars in millions) May 29, 2018 Customer related 14.2 years $ 11.5 Technology related 10.3 years 36.5 Trade names 15.0 years 4.5 Total identifiable intangible assets of Altek $ 52.5 The Company valued the customer related assets, technology related assets, and trade names using an income based approach that utilized either the multi-period excess earnings method or the relief from royalty method. The preliminary fair value of contingent consideration was estimated using a probability simulation model, which uses assumptions and estimates to forecast a range of outcomes for the contingent consideration. Key inputs to the model include projected earnings before interest, tax depreciation and amortization; the discount rate; the projection risk neutralization rate; and volatility, which are Level 3 data. The Company will assess these assumptions and estimates on a quarterly basis as additional data impacting the assumptions is obtained. Any changes in the fair value of contingent consideration related to updated assumptions and estimates will be recognized in the Consolidated Statements of Operations during the period in which the change occurs. The purchase price allocation for this transaction is not final and the fair value of intangible assets, goodwill and contingent consideration may vary significantly from those reflected in the condensed consolidated financial statements at June 30, 2018. Inclusion of pro forma financial information for this transaction is not necessary as the acquisition is immaterial to the Company's results of operations.

Accounts Receivable and Invento

Accounts Receivable and Inventories	6 Months Ended
	Jun. 30, 2018
Accounts Receivable And Inventories
Accounts Receivable and Inventories	Accounts Receivable and Inventories Accounts receivable consist of the following: (In thousands) June 30 December 31 Trade accounts receivable $ 299,723 $ 292,765 Less: Allowance for doubtful accounts (4,333 ) (4,731 ) Trade accounts receivable, net $ 295,390 $ 288,034 Other receivables (a) $ 27,349 $ 20,224 (a) Other receivables include insurance claim receivables, employee receivables, tax claim receivables and other miscellaneous receivables not included in Trade accounts receivable, net. The provision (benefit) for doubtful accounts related to trade accounts receivable was as follows: Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Provision (benefit) for doubtful accounts related to trade accounts receivable $ (110 ) $ 1,197 $ (156 ) $ 1,175 Inventories consist of the following: (In thousands) June 30 December 31 Finished goods $ 21,463 $ 26,415 Work-in-process 18,777 24,367 Contracts-in-process (b) — 45,599 Raw materials and purchased parts 67,389 58,943 Stores and supplies 23,242 22,969 Total inventories $ 130,871 $ 178,293 Contracts-in-process consist of the following: (In thousands) December 31 Contract costs accumulated to date $ 73,740 Estimated forward loss provisions for contracts-in-process (c) (28,141 ) Contracts-in-process (b) (d) $ 45,599 (b) The Company has adopted the new revenue recognition standard utilizing the modified retrospective transition method, including use of practical expedients. Amounts previously reported as Contracts-in-progress have been recognized through the related cumulative catch-up adjustment. See Note 2, Recently Adopted and Recently Issued Accounting Standards for additional information. (c) For periods prior to January 1, 2018, to the extent that the estimated forward loss provision exceeds accumulated contract costs it is included in the caption Other current liabilities on the Condensed Consolidated Balance Sheets and amounted to $3.0 million at December 31, 2017 . (d) At June 30, 2018 and December 31, 2017 , the Company has $39.9 million and $97.9 million , respectively, of net customer advances related to SBB contracts. These amounts are included in the caption Current portion of advances on contracts and Advances on contracts, representing the non-current portion, on the Condensed Consolidated Balance Sheets. The Company recognized an initial estimated forward loss provision related to the contracts with the federal railway system of Switzerland ("SBB") of $45.1 million for the year ended December 31, 2016 . The Company recorded an additional forward loss provision of $1.8 million for the six months ended June 30, 2018 . At June 30, 2018 , the entire remaining estimated forward loss provision of $10.2 million is included in the caption Other current liabilities on the Condensed Consolidated Balance Sheets. The estimated forward loss provision represents the Company's best estimate based on currently available information. It is possible that the Company's overall estimate of costs to complete these contracts may increase, which would result in an additional estimated forward loss provision at such time, but the Company is unable to estimate any further possible loss or range of loss at this time. The Company recognized $7.5 million and $15.5 million of revenues for the contracts with SBB, on an over time basis, utilizing an input method based on costs incurred for the three and six months ended June 30, 2018 , respectively. The Company did not recognize any revenue for the contracts with SBB for the three and six months ended June 30, 2017 . For three and six months ended June 30, 2018 , consolidated product revenue gross margins were not significantly impacted by the revenue recognized under the SBB contracts. The Company is approximately 98% complete on the first contract and 21% complete on the second contract with SBB as of June 30, 2018 .

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment consists of the following: (In thousands) June 30 December 31 Land $ 10,532 $ 10,840 Land improvements 16,117 14,996 Buildings and improvements 194,193 198,582 Machinery and equipment 1,571,753 1,599,713 Uncompleted construction 27,466 24,387 Gross property, plant and equipment 1,820,061 1,848,518 Less: Accumulated depreciation (1,358,155 ) (1,368,771 ) Property, plant and equipment, net $ 461,906 $ 479,747

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The following table reflects the changes in carrying amounts of goodwill by segment for the six months ended June 30, 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 Changes to goodwill 20,942 (a) — — 20,942 Foreign currency translation (8,863 ) — — (8,863 ) Balance at June 30, 2018 $ 393,972 $ 6,839 $ 13,026 $ 413,837 (a) Changes to goodwill in the Harsco Metals & Minerals Segment relate to the acquisition of Altek. The purchase price allocation is not yet final for this acquisition. See Note 3, Acquisitions. The Company tests for goodwill impairment annually or more frequently if indicators of impairment exist, or if a decision is made to dispose of a business. The Company performs the annual goodwill impairment test as of October 1 and monitors for triggering events on an ongoing basis. The Company determined that, as of June 30, 2018 , no interim goodwill impairment testing was necessary. Intangible assets included in the caption, Intangible assets, net, on the Condensed Consolidated Balance Sheets consist of the following: June 30, 2018 December 31, 2017 (In thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Customer related (b) $ 161,149 $ 120,898 $ 153,014 $ 121,385 Patents 5,748 5,645 5,825 5,700 Technology related (b) 61,646 26,126 26,131 26,131 Trade names (b) 12,713 5,016 8,317 4,845 Other 8,748 6,054 8,875 5,850 Total $ 250,004 $ 163,739 $ 202,162 $ 163,911 (b) The increase in Customer related, Technology related and Trade names intangible assets is related to the acquisition of Altek. The purchase price allocation is not yet final for this acquisition. See Note 3, Acquisitions. Amortization expense for intangible assets was as follows: Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Amortization expense for intangible assets $ 1,649 $ 1,280 $ 2,931 $ 2,598 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 (c) $ 7,900 $ 9,750 $ 9,250 $ 8,800 $ 8,500 (c) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange fluctuations and are subject to change pending finalization of the purchase price allocation for Altek.

Debt and Credit Agreements

Debt and Credit Agreements	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt and Credit Agreements	Debt and Credit Agreements In June 2018, the Company amended the existing Senior Secured Credit Facility in order to, among other things, reduce the interest rate applicable to the Term Loan Facility and to increase the limit of the Revolving Credit Facility. As a result of the amendments, borrowings under the Term Loan Facility now bear interest at a rate per annum of 225 basis points over the adjusted LIBOR rate and the facility limit under the Revolving Credit Facility has increased to $500 million . Additionally, a charge of $1.0 million was recorded during the second quarter of 2018 consisting principally of fees associated with the transaction and the write-off of unamortized deferred financing costs.

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans Three Months Ended June 30 Defined Benefit Pension Plans Net Periodic Pension Cost U.S. Plans International Plans (In thousands) 2018 2017 2018 2017 Service costs $ 11 $ 11 $ 408 $ 406 Interest costs 2,390 2,470 5,442 5,773 Expected return on plan assets (3,017 ) (2,621 ) (10,696 ) (10,515 ) Recognized prior service costs — 8 (37 ) 46 Recognized loss 1,302 1,425 3,690 4,087 Defined benefit pension plans net periodic pension cost (benefit) $ 686 $ 1,293 $ (1,193 ) $ (203 ) Six Months Ended June 30 Defined Benefit Pension Plans Net Periodic Pension Cost U.S. Plans International Plans (In thousands) 2018 2017 2018 2017 Service costs $ 21 $ 22 $ 794 $ 817 Interest costs 4,781 4,939 11,114 11,507 Expected return on plan assets (6,034 ) (5,242 ) (21,841 ) (20,939 ) Recognized prior service costs — 16 (76 ) 91 Recognized loss 2,604 2,850 7,530 8,129 Settlement/curtailment losses 166 — — — Defined benefit pension plans net periodic pension cost (income) $ 1,538 $ 2,585 $ (2,479 ) $ (395 ) On January 1, 2018, the Company adopted changes issued by the FASB related to how employers that sponsor defined benefit pension plans and other postretirement plans present NPPC in the statement of operations. Employers are required to report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. Other components of NPPC are required to be presented in the statement of operations separately from the service cost component and outside of the subtotal of income from operations. See Note 2, Recently Adopted and Recently Issued Accounting Standards, for additional details. Three Months Ended Six Months Ended Company Contributions June 30 June 30 (In thousands) 2018 2017 2018 2017 Defined benefit pension plans (U.S.) $ 2,067 $ 471 $ 3,351 $ 942 Defined benefit pension plans (International) 3,239 2,963 12,973 11,300 Multiemployer pension plans 519 498 1,020 983 Defined contribution pension plans 2,747 2,468 5,582 5,028 The Company's estimate of expected contributions to be paid during the remainder of 2018 for the U.S. and international defined benefit pension plans are $6.6 million and $5.6 million , respectively.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense related to continuing operations for the three and six months ended June 30, 2018 was $1.9 million and $10.2 million , respectively and for the three and six months ended June 30, 2017 was $11.2 million and $17.5 million , respectively. Income tax expense decreased primarily due to an $8.3 million tax benefit arising from the adjustment to certain existing deferred tax asset valuation allowances as the result of the Altek acquisition, as well as changes in U.S. tax law. An income tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon examination, based on technical merits, including resolutions of any related appeals or litigation processes. The reserve for uncertain tax positions at June 30, 2018 was $4.9 million , including interest and penalties. Within the next twelve months, it is reasonably possible that $1.1 million of unrecognized income tax benefits will be recognized upon settlement of tax examinations and the expiration of various statutes of limitations. As a result of the Act, the Company recorded a provisional charge of $48.7 million included in Income tax expense in the Company’s Consolidated Statements of Operations for 2017. The Company is currently accumulating and processing data to finalize the underlying calculations and expects to complete the calculation when the Company’s 2017 U.S. corporate income tax return is filed later in 2018.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Environmental The Company is involved in a number of environmental remediation investigations and cleanups and, along with other companies, has been identified as a “potentially responsible party” for certain waste disposal sites. While each of these matters is subject to various uncertainties, it is probable that the Company will agree to make payments toward funding certain of these activities, and it is possible that some of these matters will be decided unfavorably to the Company. The Company has evaluated its potential liability, and its financial exposure is dependent upon such factors as the continuing evolution of environmental laws and regulatory requirements, the availability and application of technology, the allocation of cost among potentially responsible parties, the years of remedial activity required and the remediation methods selected. The Company did not have any material accruals or record any material expenses related to environmental matters during the periods presented. The Company evaluates its liability for future environmental remediation costs on a quarterly basis. Although actual costs to be incurred at identified sites in future periods may vary from the estimates (given inherent uncertainties in evaluating environmental exposures), the Company does not expect that any costs that are reasonably possible to be incurred by the Company in connection with environmental matters in excess of the amounts accrued would have a material adverse effect on the Company's financial condition, results of operations or cash flows. Brazilian Tax Disputes The Company is involved in a number of tax disputes with federal, state and municipal tax authorities in Brazil. These disputes are at various stages of the legal process, including the administrative review phase and the collection action phase, and include assessments of fixed amounts of principal and penalties, plus interest charges that increase at statutorily determined amounts per month and are assessed on the aggregate amount of the principal and penalties. In addition, the losing party at the collection action or court of appeals phase could be subject to a charge to cover statutorily mandated legal fees, which are generally calculated as a percentage of the total assessed amounts due, inclusive of penalty and interest. A large number of the claims relate to value-added ("ICMS"), services and social security tax disputes. The largest proportion of the assessed amounts relate to ICMS claims filed by the State Revenue Authorities from the State of São Paulo, Brazil (the "SPRA"), encompassing the period from January 2002 to May 2005. In October 2009, the Company received notification of the SPRA’s final administrative decision regarding the levying of ICMS in the State of São Paulo in relation to services provided to a customer in the State between January 2004 and May 2005. As of June 30, 2018 , the principal amount of the tax assessment from the SPRA with regard to this case is approximately $2 million , with penalty, interest and fees assessed to date increasing such amount by an additional $21 million . Any change in the aggregate amount since the Company’s last Annual Report on Form 10-K for the year ended December 31, 2017 is due to an increase in assessed interest and statutorily mandated legal fees for the period, as well as foreign currency translation. On June 4, 2018, the Trial Court of the State of Sao Paulo ruled in favor of the SPRA, but ruled that the assessed penalty should be reduced to approximately $2 million . After calculating the interest accrued on the penalty, the Company estimates that this ruling reduces the current overall liability for this case to approximately $9 million . The Company has filed a motion for clarification on the ruling, which is still pending before the court. In the event the motion for clarification is unsuccessful, the Company plans to appeal both the liability ruling and the amount assessed. Due to multiple court precedents in the Company’s favor, as well as the Company’s ability to seek clarification as well as appeal, the Company does not believe a loss is probable. Another ICMS tax case involving the SPRA refers to the tax period from January 2002 to December 2003, and has not yet reached the judicial phase. The aggregate amount assessed by the tax authorities in August 2005 was $6.5 million (the amounts with regard to this claim are valued as of the date of the assessment since it has not yet reached the collection phase), composed of a principal amount of $1.5 million , with penalty and interest assessed through that date increasing such amount by an additional $5.0 million . All such amounts include the effect of foreign currency translation. The Company continues to believe that sufficient coverage for these claims exists as a result of the indemnification obligations of the Company's customer and such customer’s pledge of assets in connection with the October 2009 notice, as required by Brazilian law. The Company intends to continue its practice of vigorously defending itself against these tax claims under various alternatives, including judicial appeal. The Company will continue to evaluate its potential liability with regard to these claims on a quarterly basis; however, it is not possible to predict the ultimate outcome of these tax-related disputes in Brazil. No loss provision has been recorded in the Company's condensed consolidated financial statements for the disputes described above because the loss contingency is not deemed probable, and the Company does not expect that any costs that are reasonably possible to be incurred by the Company in connection with Brazilian tax disputes would have a material adverse effect on the Company's financial condition, results of operations or cash flows. Brazilian Labor Disputes The Company is subject to ongoing collective bargaining and individual labor claims in Brazil through the Harsco Metals & Minerals Segment which allege, among other things, the Company's failure to pay required amounts for overtime and vacation at certain sites. The Company is vigorously defending itself against these claims; however, litigation is inherently unpredictable, particularly in foreign jurisdictions. While the Company does not currently expect that the ultimate resolution of these claims will have a material adverse effect on the Company’s financial condition, results of operations or cash flows, it is not possible to predict the ultimate outcome of these labor-related disputes. The Company is continuing to review all known labor claims, and, as of June 30, 2018 and December 31, 2017 , the Company has established reserves of $8.7 million and $9.6 million , respectively, on the Company's Condensed Consolidated Balance Sheets for amounts considered to be probable and estimable. As the Company continues to evaluate these claims and takes actions to address them, the amount of established reserves may be impacted. Customer Disputes The Company may, in the normal course of business, become involved in commercial disputes with subcontractors or customers. Although results of operations and cash flows for a given period could be adversely affected by a negative outcome in these or other lawsuits, claims or proceedings, management believes that the ultimate outcome of any on going matters will not have a material adverse effect on the Company's financial condition, results of operations or cash flows. Lima Refinery Litigation On April 8, 2016, Lima Refining Company filed a lawsuit against the Company in the District Court of Harris County, Texas related to a January 2015 explosion at an oil refinery operated by Lima Refining Company. The action seeks approximately $106 million in property damages and approximately $289 million in lost profits and business interruption damages. The action alleges the explosion occurred because of a defect in a heat exchange cooler manufactured by Hammco Corporation ("Hammco") in 2009, prior to the Company’s acquisition of Hammco in 2014. The Company is vigorously contesting the allegations against it, both as to liability for the accident and the amount of the claimed damages. As a result, the Company believes the situation will not result in a probable loss. The Company has both an indemnity right from the sellers of Hammco and liability insurance coverage under various primary and excess policies that the Company believes will be available, if necessary, to cover substantially all of any such liability that might ultimately be incurred in the above action. Compliance Matter As previously disclosed, in 2017, the Company undertook an internal investigation, with the assistance of outside counsel, after it became aware of allegations involving an employee and an agent of the Harsco Rail subsidiary in China (“Harsco Rail China”). During this investigation the Company learned about certain payments that potentially violate the Foreign Corrupt Practices Act. Revenues attributed to Harsco Rail China were approximately 2% of the Company’s consolidated revenues for each of the prior three completed fiscal years. The Company has voluntarily self-reported its initial findings to the SEC and the U.S. Department of Justice (the “DOJ”) and intends to fully cooperate with these agencies in their review. Based on information known to date, the Company believes the amount of the potential improper payments are not material to the condensed consolidated financial statements. Any determination that the Company's operations or activities were not in compliance with existing laws or regulations could result in the imposition of fines and penalties. No provision with respect to this matter has been made in the Company’s condensed consolidated financial statements. At this time, the Company cannot predict the outcome or impact of the investigation or the reviews by the SEC and the DOJ. However, based on information available at this time, the Company does not believe any potential liability would be material to the Company's condensed consolidated financial position, although an amount recorded, if any, could be material to the results of operations for the period in which it may be recorded. Other The Company is named as one of many defendants (approximately 90 or more in most cases) in legal actions in the U.S. alleging personal injury from exposure to airborne asbestos over the past several decades. In their suits, the plaintiffs have named as defendants, among others, many manufacturers, distributors and installers of numerous types of equipment or products that allegedly contained asbestos. The Company believes that the claims against it are without merit. The Company has never been a producer, manufacturer or processor of asbestos fibers. Any asbestos-containing part of a Company product used in the past was purchased from a supplier and the asbestos encapsulated in other materials such that airborne exposure, if it occurred, was not harmful and is not associated with the types of injuries alleged in the pending actions. At June 30, 2018 , there were 17,286 pending asbestos personal injury actions filed against the Company. Of those actions, 16,737 were filed in the New York Supreme Court (New York County), 111 were filed in other New York State Supreme Court Counties and 438 were filed in courts located in other states. The complaints in most of those actions generally follow a form that contains a standard damages demand of $20 million or $25 million , regardless of the individual plaintiff’s alleged medical condition, and without identifying any specific Company product. At June 30, 2018 , 16,704 of the actions filed in New York Supreme Court (New York County) were on the Deferred/Inactive Docket created by the court in December 2002 for all pending and future asbestos actions filed by persons who cannot demonstrate that they have a malignant condition or discernible physical impairment. The remaining 33 cases in New York County are pending on the Active or In Extremis Docket created for plaintiffs who can demonstrate a malignant condition or physical impairment. The Company has liability insurance coverage under various primary and excess policies that the Company believes will be available, if necessary, to substantially cover any liability that might ultimately be incurred in the asbestos actions referred to above. The costs and expenses of the asbestos actions are being paid by the Company's insurers. In view of the persistence of asbestos litigation in the U.S., the Company expects to continue to receive additional claims in the future. The Company intends to continue its practice of vigorously defending these claims and cases. At June 30, 2018 , the Company has obtained dismissal in 27,999 cases by stipulation or summary judgment prior to trial. It is not possible to predict the ultimate outcome of asbestos-related actions in the U.S. due to the unpredictable nature of this litigation, and no loss provision has been recorded in the Company's condensed consolidated financial statements because a loss contingency is not deemed probable or estimable. Despite this uncertainty, and although results of operations and cash flows for a given period could be adversely affected by asbestos-related actions, the Company does not expect that any costs that are reasonably possible to be incurred by the Company in connection with asbestos litigation would have a material adverse effect on the Company's financial condition, results of operations or cash flows. As previously disclosed, the Company has had ongoing meetings with the Supreme Council for Environment in Bahrain (“SCE”) over processing a byproduct (“salt cakes”) stored at the Al Hafeerah site. The Company’s Bahrain operations that produced the salt cakes has ceased operations and are owned under a strategic venture for which its strategic venture partner owns a 35% minority interest. An Environmental Impact Assessment and Technical Feasibility Study were approved by the SCE during the first quarter of 2018. The Company has previously established a reserve of $7.0 million, payable over several years, related to the estimated cost of processing and disposal of the salt cakes. This reserve represents the Company’s best estimate of ultimate costs to be incurred. The Company continues to evaluate this reserve and any future change in estimated costs could be material to the Company’s results of operations in any one period. The Company is subject to various other claims and legal proceedings covering a wide range of matters that arose in the ordinary course of business. In the opinion of management, all such matters are adequately covered by insurance or by established reserves, and, if not so covered, are without merit or are of such kind, or involve such amounts, as would not have a material adverse effect on the financial position, results of operations or cash flows of the Company. Insurance liabilities are recorded when it is probable that a liability has been incurred for a particular event and the amount of loss associated with the event can be reasonably estimated. Insurance reserves have been estimated based primarily upon actuarial calculations and reflect the undiscounted estimated liabilities for ultimate losses, including claims incurred but not reported. Inherent in these estimates are assumptions that are based on the Company's history of claims and losses, a detailed analysis of existing claims with respect to potential value, and current legal and legislative trends. If actual claims differ from those projected by management, changes (either increases or decreases) to insurance reserves may be required and would be recorded through income in the period the change was determined. When a recognized liability is covered by third-party insurance, the Company records an insurance claim receivable to reflect the covered liability. Insurance claim receivables are included in Other receivables on the Company's Condensed Consolidated Balance Sheets. See Note 1, Summary of Significant Accounting Policies, to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for additional information on Accrued insurance and loss reserves.

Reconciliation of Basic and Dil

Reconciliation of Basic and Diluted Shares	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Shares	Reconciliation of Basic and Diluted Shares Three Months Ended Six Months Ended June 30 June 30 (In thousands, except per share amounts) 2018 2017 2018 2017 Income from continuing operations attributable to Harsco Corporation common stockholders $ 39,913 $ 18,635 $ 58,173 $ 27,902 Weighted-average shares outstanding - basic 80,861 80,535 80,756 80,460 Dilutive effect of stock-based compensation 2,782 2,315 2,838 2,098 Weighted-average shares outstanding - diluted 83,643 82,850 83,594 82,558 Earnings from continuing operations per common share, attributable to Harsco Corporation common stockholders: Basic $ 0.49 $ 0.23 $ 0.72 $ 0.35 Diluted $ 0.48 $ 0.22 $ 0.70 $ 0.34 The following average outstanding stock-based compensation units were not included in the computation of diluted earnings per share because the effect was antidilutive: Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Restricted stock units — — — — Stock options — 55 — 55 Stock appreciation rights 283 972 489 1,117 Performance share units — 176 — 320

Derivative Instruments, Hedging

Derivative Instruments, Hedging Activities and Fair Value	6 Months Ended
	Jun. 30, 2018
Derivative Instruments, Hedging Activities And Fair Value Disclosure [Abstract]
Derivative Instruments, Hedging Activities and Fair Value	Derivative Instruments, Hedging Activities and Fair Value Derivative Instruments and Hedging Activities The Company uses derivative instruments, including foreign currency exchange forward contracts, interest rate swaps and cross-currency interest rate swaps ("CCIRs"), to manage certain foreign currency and interest rate exposures. Derivative instruments are viewed as risk management tools by the Company and are not used for trading or speculative purposes. All derivative instruments are recorded on the Condensed Consolidated Balance Sheets at fair value. Changes in the fair value of derivatives used to hedge foreign currency denominated balance sheet items are reported directly in earnings, along with offsetting transaction gains and losses on the items being hedged. Derivatives used to hedge forecasted cash flows associated with foreign currency commitments may be accounted for as cash flow hedges, as deemed appropriate if the criteria for hedge accounting are met. Gains and losses on derivatives designated as cash flow hedges are deferred in Accumulated other comprehensive loss, a separate component of equity, and reclassified to earnings in a manner that matches the timing of the earnings impact of the hedged transactions. The ineffective portion of all hedges, if any, is recognized currently in earnings. The fair value of outstanding derivative contracts recorded as assets and liabilities on the Condensed Consolidated Balance Sheets was as follows: Asset Derivatives Liability Derivatives (In thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value June 30, 2018 Derivatives designated as hedging instruments: Foreign currency exchange forward contracts Other current assets $ 2,183 Other current liabilities $ 389 Interest rate swaps Other current assets 1,623 Interest rate swaps Other assets 3,142 Other liabilities $ 353 Total derivatives designated as hedging instruments $ 6,948 $ 742 Derivatives not designated as hedging instruments : Foreign currency exchange forward contracts Other current assets $ 11,567 Other current liabilities $ 2,415 Asset Derivatives Liability Derivatives (In thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value December 31, 2017 Derivatives designated as hedging instruments: Foreign currency exchange forward contracts Other current assets $ 2,329 Other current liabilities $ 153 Interest rate swaps Other current assets 464 Interest rate swaps Other assets 170 Other liabilities 1,368 Total derivatives designated as hedging instruments $ 2,963 $ 1,521 Derivatives not designated as hedging instruments : Foreign currency exchange forward contracts Other current assets $ 2,915 Other current liabilities $ 6,970 All of the Company's derivatives are recorded in the Condensed Consolidated Balance Sheets at gross amounts and not offset. All of the Company's interest rate swaps, CCIRs and certain foreign currency exchange forward contracts are transacted under International Swaps and Derivatives Association ("ISDA") documentation. Each ISDA master agreement permits the net settlement of amounts owed in the event of default. The Company's derivative assets and liabilities subject to enforceable master netting arrangements resulted in a net asset of $1.1 million and a net liability of $0.2 million at June 30, 2018 and December 31, 2017 , respectively. The effect of derivative instruments in the Condensed Consolidated Statements of Operations and the Condensed Consolidated Statements of Comprehensive Income, was as follows: Derivatives Designated as Hedging Instruments (In thousands) Amount Recognized in Other Comprehensive Income (“OCI”) on Derivative - Effective Portion Location of Amount Reclassified from Accumulated OCI into Income - Effective Portion Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity Location of Amount Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing Amount Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing Three Months Ended June 30, 2018: Foreign currency exchange forward contracts $ 1,539 Product revenues $ 103 $ — Interest rate swaps 2,071 Interest expense (235 ) — Cross-currency interest rate swaps 93 (a) Interest expense 377 — $ 3,703 $ 245 $ — Three Months Ended June 30, 2017: Foreign currency exchange forward contracts $ 1,001 Product revenues/Cost of services and products sold $ (186 ) $ — Interest rate swaps (2,021 ) — — Cross-currency interest rate swaps 3 (a) Interest Expense 251 Cost of services and products sold (107 ) $ (1,017 ) $ 65 $ (107 ) (In thousands) Amount Recognized in OCI on Derivative - Effective Portion Location Amount Reclassified from Accumulated OCI into Income - Effective Portion Amount Reclassified from Accumulated OCI into Income - Effective Portion Location of Amount Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing Amount Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing Six Months Ended June 30, 2018: Foreign currency forward exchange contracts $ 1,779 Product revenues / Cost of services and products sold $ (109 ) $ — Foreign currency forward exchange contracts — Retained earnings (b) (1,520 ) — Interest rate swaps 5,381 Interest expense (235 ) — Cross currency interest rate swaps — Interest expense 648 — $ 7,160 $ (1,216 ) $ — Six Months Ended June 30, 2017: Foreign currency forward exchange contracts $ 763 Product revenues / Cost of services and products sold $ (185 ) $ — Interest rate swaps (2,543 ) — — Cross currency interest rate swaps (123 ) (a) Interest expense 493 Cost of services and products sold (317 ) $ (1,903 ) $ 308 $ (317 ) (a) Amounts represent changes in foreign currency translation related to balances in Accumulated other comprehensive loss. (b) The Company has adopted the new revenue recognition standard utilizing the modified retrospective transition method, including use of practical expedients. See Note 2, Recently Adopted and Recently Issued Accounting Standards for additional information. Derivatives Not Designated as Hedging Instruments Location of Gain (Loss) Recognized in Income on Derivative Amount of Gain (Loss) Recognized in Income on Derivative for the Three Months Ended June 30 (d) (In thousands) 2018 2017 Foreign currency exchange forward contracts Cost of services and products sold $ 15,731 $ (13,289 ) Location of Gain (Loss) Recognized in Income on Derivative Amount of Gain (Loss) Recognized in Income on Derivative for the Six Months Ended June 30 (d) (In thousands) 2018 2017 Foreign currency forward exchange contracts Cost of services and products sold $ 10,265 $ (11,739 ) (d) These gains (losses) offset amounts recognized in cost of services and products sold principally as a result of intercompany or third party foreign currency exposures. Foreign Currency Exchange Forward Contracts The Company conducts business in multiple currencies and, accordingly, is subject to the inherent risks associated with foreign exchange rate movements. The financial position and results of operations of substantially all of the Company’s foreign subsidiaries are measured using the local currency as the functional currency. Foreign currency-denominated assets and liabilities are translated into U.S. dollars at the exchange rates existing at the respective balance sheet dates, and income and expense items are translated at the average exchange rates during the respective periods. The aggregate effects of translating the balance sheets of these subsidiaries are deferred and recorded in Accumulated other comprehensive loss, which is a separate component of equity. The Company uses derivative instruments to hedge cash flows related to foreign currency fluctuations. Foreign currency exchange forward contracts outstanding are part of a worldwide program to minimize foreign currency exchange operating income and balance sheet exposure by offsetting foreign currency exposures of certain future payments between the Company and various subsidiaries, suppliers or customers. The unsecured contracts are with major financial institutions. The Company may be exposed to credit loss in the event of non-performance by the contract counterparties. The Company evaluates the creditworthiness of the counterparties and does not expect default by them. Foreign currency exchange forward contracts are used to hedge commitments, such as foreign currency debt, firm purchase commitments and foreign currency cash flows for certain export sales transactions. The following tables summarize, by major currency, the contractual amounts of the Company’s foreign currency exchange forward contracts in U.S. dollars. The “Buy” amounts represent the U.S. dollar equivalent of commitments to purchase foreign currencies, and the “Sell” amounts represent the U.S. dollar equivalent of commitments to sell foreign currencies. The recognized gains and losses offset amounts recognized in cost of services and products sold principally as a result of intercompany or third party foreign currency exposures. Contracted Amounts of Foreign Currency Exchange Forward Contracts Outstanding at June 30, 2018 : (In thousands) Type U.S. Dollar Equivalent Maturity Recognized Gain (Loss) British pounds sterling Sell $ 96,546 July 2018 through October 2021 $ 3,024 British pounds sterling Buy 9,590 July 2018 through January 2019 (157 ) Euros Sell 306,503 July 2018 through March 2019 8,258 Euros Buy 192,929 July 2018 through November 2018 (1,435 ) Other currencies Sell 41,096 July 2018 through December 2018 1,296 Other currencies Buy 2,901 July 2018 (40 ) Total $ 649,565 $ 10,946 Contracted Amounts of Foreign Currency Exchange Forward Contracts Outstanding at December 31, 2017 : (In thousands) Type U.S. Dollar Equivalent Maturity Recognized Gain (Loss) British pounds sterling Sell $ 76,761 January 2018 $ (769 ) British pounds sterling Buy 5,960 January 2018 72 Euros Sell 314,649 January 2018 through December 2018 (4,916 ) Euros Buy 223,111 January 2018 through November 2018 4,564 Other currencies Sell 39,889 January 2018 through June 2018 (1,049 ) Other currencies Buy 11,487 January 2018 219 Total $ 671,857 $ (1,879 ) In addition to foreign currency exchange forward contracts, the Company designates certain loans as hedges of net investments in international subsidiaries. The Company recorded pre-tax net loss of $16.1 million and $6.6 million during the three and six months ended June 30, 2018 , respectively and pre-tax net gains of $7.7 million and $9.5 million for the three and six months ended June 30, 2017 , respectively, in Accumulated other comprehensive loss . Interest Rate Swaps The Company uses interest rate swaps in conjunction with certain debt issuances in order to secure a fixed interest rate. The interest rate swaps are recorded on the Condensed Consolidated Balance Sheets at fair value, with changes in value attributed to the effect of the swaps’ interest spread and changes in the credit worthiness of the counter-parties recorded in Accumulated other comprehensive loss. In January 2017 and February 2018, the Company entered into a series of interest rate swaps that cover the period from 2018 through 2022, and had the effect of converting $300.0 million of the Term Loan Facility from floating-rate to fixed-rate beginning in 2018. The fixed rates provided by the swaps replace the adjusted LIBOR rate in the interest calculation, ranging from 1.65% for 2018 to 3.12% for 2022. The following table indicates the notional amounts of the Company's interest rate swaps at June 30, 2018 : Annual Notional Amount Interest Rates (In millions) Receive Pay Maturing 2018 through 2022 $ 300.0 Floating U.S. dollar rate Fixed U.S. dollar rate Cross-Currency Interest Rate Swaps The Company may use CCIRs in conjunction with certain debt issuances in order to secure a fixed local currency interest rate. Under these CCIRs, the Company receives interest based on a fixed or floating U.S. dollar rate and pays interest on a fixed local currency rate based on the contractual amounts in dollars and the local currency, respectively. At maturity, there is also the payment of principal amounts between currencies. The CCIRs are recorded on the Condensed Consolidated Balance Sheets at fair value, with changes in value attributed to the effect of the swaps' interest spread and changes in the credit worthiness of the counter-parties recorded in Accumulated other comprehensive loss. Changes in value attributed to the effect of foreign currency fluctuations are recorded in the Condensed Consolidated Statements of Operations and offset currency fluctuation effects on the debt principal. The Company had no outstanding CCIRs at June 30, 2018 . Fair Value of Derivative Assets and Liabilities and Other Financial Instruments Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). The Company utilizes market data or assumptions that the Company believes market participants would use in valuing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. The fair value hierarchy distinguishes between (1) market participant assumptions developed based on market data obtained from independent sources (observable inputs), and (2) an entity’s own assumptions about market participant assumptions based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which give the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below: • Level 1—Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. • Level 2—Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3—Inputs that are both significant to the fair value measurement and unobservable. In instances in which multiple levels of inputs are used to measure fair value, hierarchy classification is based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability. The following table indicates the fair value hierarchy of the financial instruments of the Company: Level 2 Fair Value Measurements (In thousands) June 30 December 31 Assets Foreign currency exchange forward contracts $ 13,750 $ 5,244 Interest rate swaps 4,765 634 Liabilities Foreign currency exchange forward contracts 2,804 7,123 Interest rate swaps 353 1,368 The Company primarily applies the market approach for recurring fair value measurements and endeavors to utilize the best available information. Accordingly, the Company utilizes valuation techniques that maximize the use of observable inputs, such as forward rates, interest rates, the Company’s credit risk and counterparties’ credit risks, and which minimize the use of unobservable inputs. The Company is able to classify fair value balances based on the ability to observe those inputs. Foreign currency exchange forward contracts, interest rate swaps and CCIRs are based upon pricing models using market-based inputs (Level 2). Model inputs can be verified, and valuation techniques do not involve significant management judgment. The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable, accrued liabilities and short-term borrowings approximate fair value due to the short-term maturities of these assets and liabilities. At June 30, 2018 and December 31, 2017 , the total fair value of long-term debt (excluding deferred financing costs), including current maturities, was $674.2 million and $599.1 million , respectively, compared with a carrying value of $675.1 million and $593.7 million , respectively. Fair values for debt are based on pricing models using market based inputs (Level 2) for similar issues or on the current rates offered to the Company for debt of the same remaining maturities.

Review of Operations by Segment

Review of Operations by Segment	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Review of Operations by Segment	Review of Operations by Segment Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Revenues From Continuing Operations Harsco Metals & Minerals $ 272,320 $ 259,306 $ 537,043 $ 506,340 Harsco Industrial 92,065 73,563 175,663 139,448 Harsco Rail 67,552 61,994 127,230 121,582 Corporate 35 35 74 69 Total Revenues From Continuing Operations $ 431,972 $ 394,898 $ 840,010 $ 767,439 Operating Income From Continuing Operations Harsco Metals & Minerals $ 35,661 $ 31,464 $ 63,396 $ 57,221 Harsco Industrial 14,170 9,240 26,591 12,134 Harsco Rail 8,618 8,192 10,570 14,409 Corporate (4,824 ) (5,747 ) (10,391 ) (12,008 ) Total Operating Income From Continuing Operations $ 53,625 $ 43,149 $ 90,166 $ 71,756 Depreciation and Amortization Harsco Metals & Minerals $ 28,632 $ 27,928 $ 57,717 $ 55,808 Harsco Industrial 1,882 1,843 3,737 3,683 Harsco Rail 1,039 1,025 2,103 2,062 Corporate 1,666 1,479 3,014 2,950 Total Depreciation and Amortization $ 33,219 $ 32,275 $ 66,571 $ 64,503 Capital Expenditures Harsco Metals & Minerals $ 24,423 $ 21,599 $ 49,599 $ 37,071 Harsco Industrial 2,916 796 4,003 1,548 Harsco Rail 2,088 1,083 2,518 1,303 Corporate 172 233 376 778 Total Capital Expenditures $ 29,599 $ 23,711 $ 56,496 $ 40,700 Reconciliation of Segment Operating Income to Income From Continuing Operations Before Income Taxes Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Segment operating income $ 58,449 $ 48,896 $ 100,557 $ 83,764 General Corporate expense (4,824 ) (5,747 ) (10,391 ) (12,008 ) Operating income from continuing operations 53,625 43,149 90,166 71,756 Interest income 577 493 1,075 1,005 Interest expense (9,993 ) (12,405 ) (19,576 ) (24,058 ) Defined benefit pension income (expense) 904 (675 ) 1,743 (1,374 ) Loss on early extinguishment of debt (1,034 ) — (1,034 ) — Income from continuing operations before income taxes $ 44,079 $ 30,562 $ 72,374 $ 47,329

Revenue Recognition

Revenue Recognition	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The Company recognizes revenues to depict the transfer of promised services and products to customers in an amount that reflects the consideration the Company expects to receive in exchange for those services or products. Service revenues include the service components of the Harsco Metals & Minerals and Harsco Rail Segments. Product revenues include the Harsco Industrial Segment and the product revenues of the Harsco Metals & Minerals and Harsco Rail Segments. Harsco Metals & Minerals - This Segment provides on-site services, under long-term contracts, for material logistics; product quality improvement and resource recovery from iron, steel and metals manufacturing; and also manufactures and sells industrial abrasives and roofing granule products. • Service revenues are recognized over time as the customer simultaneously receives the benefits provided by the Company's performance. The Company utilizes an output method based on work performed (liquid steel tons processed, weight of material handled, etc.) to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contractual terms, which may include both fixed and variable portions. The fixed portion is recognized as earned (normally monthly) over the contractual period. The variable portion is recognized as services are performed and differs based on the volume of services performed. Given the long-term nature of these arrangements, most contracts permit periodic adjustment of either the variable or both the fixed and variable portions based on the changes in macroeconomic indicators, including changes in commodity prices. Transaction prices, when the standalone selling price is not directly observable, are allocated to performance obligations utilizing an expected cost plus a margin approach. Amounts are typically billed and payable on a monthly basis as services are performed. • Product revenues are recognized at the point when control transfers to the customer. Control generally transfers at the point of shipment for domestic orders and in accordance with the international commercial terms included in contracts for export sales. Transaction prices are based on contractual terms, which are generally fixed and when the standalone selling price is not directly observable, allocated to performance obligations utilizing an adjusted market assessment approach. Amounts are billed and payable upon completion of each transaction. At June 30, 2018, the Harsco Metals & Minerals Segment had remaining, fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year totaling $139.5 million . Of this amount, $39.8 million is expected to be fulfilled by June 30, 2019, $33.1 million by June 30, 2020, $23.2 million by June 30, 2021, $17.5 million by June 30, 2022 and the remainder thereafter. These amounts exclude any variable fees, fixed fees subject to indexation and any performance obligations expected to be satisfied within one year. The increase in remaining, fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year is primarily attributable to a new contracts entered into during the second quarter of 2018. Harsco Industrial - This segment sells air-cooled heat exchangers, metal bar grating configurations and energy-efficient heat transfer products. • For air-cooled heat exchangers, revenue is recognized over time as control is transferred to the customer. Control transfers over time because the air-cooled heat exchangers are customized, have no alternate use and the Company has an enforceable right to payment. The Company utilizes an input method based on costs incurred to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contractual terms, which are generally fixed, and when the standalone selling price is not directly observable, allocated to performance obligations utilizing an adjusted market assessment approach. The Company may receive periodic payments associated with key milestones with any remaining consideration billed and payable upon completion of the transaction. • For metal bar grating configurations and energy-efficient heat transfer products, revenue is recognized at the point when control transfers to the customer. Control generally transfers at the point of shipment for domestic orders and in accordance with the international commercial terms included in contracts for export sales. Transaction prices are based on contractual terms, which are generally fixed, and when the standalone selling price is not directly observable, allocated to performance obligations utilizing an adjusted market assessment approach. Amounts are billed and payable upon completion of each transaction though advance payments are required in limited circumstances. Harsco Rail - This Segment sells railway track maintenance equipment, after-market parts and provides railway track maintenance services. • For the majority of railway track maintenance equipment sales, revenue is recognized at the point when control transfers to the customer. Control generally transfers at the point of shipment for domestic orders and in accordance with the international commercial terms included in contracts for export sales. In certain railway track maintenance equipment sales, revenue is recognized over time because such equipment is highly customized, has no alternate use and the Company has an enforceable right to payment. In such instances, the Company utilizes an input method based on costs incurred to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contracted terms, which are generally fixed, and when the standalone selling price is not directly observable, allocated to performance obligations utilizing either the adjusted market assessment or expected cost plus a margin approach. For certain transactions, the Company receives periodic payments associated with key milestones. In limited instances, those payments are intended to provide financing with such transactions being treated as including a significant financing component. Any remaining consideration is billed and payable upon completion of the transaction. • For after-market parts sales, revenue is recognized at the point when control transfers to the customer. Control generally transfer to the customer at the point of shipment for domestic orders and in accordance with the international commercial terms included in contracts for export sales. Transaction prices are based on contracted terms, which are generally fixed, and when the standalone selling price is not directly observable, allocated to performance obligations utilizing an adjusted market assessment approach. Amounts are billed and payable upon completion of each contract. • For railway track maintenance services, revenue is recognized over time as the customer simultaneously receives the benefits provided by the Company's performance. The Company utilizes an appropriate output method based on work performed (feet, miles, shifts worked, etc.) to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contracted terms, which are generally variable. The variable portion is recognized as services are performed and differs based on the value of services. Given the long-term nature of these arrangements, most contracts permit periodic adjustment based on the changes in macroeconomic indicators. Transaction prices, when the standalone selling price is not directly observable, are allocated to performance obligations utilizing an expected cost plus a margin approach. Amounts are typically billed and payable on a monthly basis as services are performed. At June 30, 2018, the Harsco Rail Segment had remaining, fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year totaling $204.5 million . Of this amount, $38.1 million is expected to be fulfilled by June 30, 2019, $70.0 million by June 30, 2020, $57.0 million by June 30, 2021, $30.1 million by June 30, 2022 and the remainder thereafter. These amounts exclude any variable fees, fixed fees subject to indexation and any performance obligations expected to be satisfied within one year. The increase in remaining, fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year is primarily attributable to new contracts entered into during the second quarter of 2018. A summary of the Company's revenues by primary geographical markets as well as by key product and service groups is as follows: Three Months Ended June 30, 2018 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) : North America $ 79,862 $ 87,174 $ 47,547 $ 35 $ 214,618 Western Europe 97,410 — 13,041 — 110,451 Latin America (b) 37,388 4,891 1,331 — 43,610 Asia-Pacific 37,788 — 5,633 — 43,421 Middle East and Africa 12,150 — — — 12,150 Eastern Europe 7,722 — — — 7,722 Total Revenues (c) $ 272,320 $ 92,065 $ 67,552 $ 35 $ 431,972 Three Months Ended June 30, 2018 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Key Product and Service Groups: On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products $ 272,320 $ — $ — $ — $ 272,320 Railway track maintenance services and equipment — — 67,552 — 67,552 Air-cooled heat exchangers — 48,576 — — 48,576 Industrial grating and fencing products — 32,446 — — 32,446 Heat transfer products — 11,043 — — 11,043 General Corporate — — — 35 35 Total Revenues (c) $ 272,320 $ 92,065 $ 67,552 $ 35 $ 431,972 Three Months Ended June 30, 2017 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) : North America $ 70,759 $ 67,165 $ 48,748 $ 35 $ 186,707 Western Europe 97,516 — 6,832 — 104,348 Latin America (b) 39,758 5,308 778 — 45,844 Asia-Pacific 34,759 1,090 5,636 — 41,485 Middle East and Africa 9,953 — — — 9,953 Eastern Europe 6,561 — — — 6,561 Total Revenues (c) $ 259,306 $ 73,563 $ 61,994 $ 35 $ 394,898 Key Product and Service Groups: On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products $ 259,306 $ — $ — $ — $ 259,306 Railway track maintenance services and equipment — — 61,994 — 61,994 Air-cooled heat exchangers — 33,774 — — 33,774 Industrial grating and fencing products — 29,134 — — 29,134 Heat transfer products — 10,655 — — 10,655 General Corporate — — — 35 35 Total Revenues (c) $ 259,306 $ 73,563 $ 61,994 $ 35 $ 394,898 Six Months Ended June 30, 2018 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) : North America $ 150,927 $ 166,032 $ 87,952 $ 74 $ 404,985 Western Europe 194,331 — 27,761 — 222,092 Latin America (b) 78,846 9,631 2,164 — 90,641 Asia-Pacific 74,009 — 9,353 — 83,362 Middle East and Africa 23,703 — — — 23,703 Eastern Europe 15,227 — — — 15,227 Total Revenues (c) $ 537,043 $ 175,663 $ 127,230 $ 74 $ 840,010 Six Months Ended June 30, 2018 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Key Product and Service Groups: On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products $ 537,043 $ — $ — $ — $ 537,043 Railway track maintenance services and equipment — — 127,230 — 127,230 Air-cooled heat exchangers — 92,843 — — 92,843 Industrial grating and fencing products — 62,543 — — 62,543 Heat transfer products — 20,277 — — 20,277 General Corporate — — — 74 74 Total Revenues (c) $ 537,043 $ 175,663 $ 127,230 $ 74 $ 840,010 Six Months Ended June 30, 2017 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) : North America $ 137,992 $ 125,516 $ 93,898 $ 69 $ 357,475 Western Europe 189,236 — 16,371 — 205,607 Latin America (b) 77,778 11,890 1,254 — 90,922 Asia-Pacific 67,316 2,042 10,059 — 79,417 Middle East and Africa 20,509 — — — 20,509 Eastern Europe 13,509 — — — 13,509 Total Revenues (c) $ 506,340 $ 139,448 $ 121,582 $ 69 $ 767,439 Key Product and Service Groups: On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products $ 506,340 $ — $ — $ — $ 506,340 Railway track maintenance services and equipment — — 121,582 — 121,582 Air-cooled heat exchangers — 64,235 — — 64,235 Industrial grating and fencing products — 57,293 — — 57,293 Heat transfer products — 17,920 — — 17,920 General Corporate — — — 69 69 Total Revenues (c) $ 506,340 $ 139,448 $ 121,582 $ 69 $ 767,439 (a) Revenues are attributed to individual countries based on the location of the facility generating the revenue. (b) Includes Mexico. (c) The Company has adopted the new revenue recognition standard utilizing the modified retrospective transition method, including use of practical expedients. Comparative information has not been restated and continues to be reported under U.S. GAAP in effect for those periods. See Note 2, Recently Adopted and Recently Issued Accounting Standards for additional information. The Company may receive payments in advance of earning revenue, which are treated as Advances on contracts on the Condensed Consolidated Balance Sheets. The Company may recognize revenue in advance of being able to contractually invoice the customer, which is treated as Contract assets on the Condensed Consolidated Balance Sheet. Contract assets are transferred to Trade accounts receivable, net when right to payment becomes unconditional. Contract assets and Contract liabilities are reported as a net position, on a contract-by-contract basis, at the end of each reporting period. These instances are primarily related to the Harsco Rail Segment and air-cooled heat exchangers business of the Harsco Industrial Segment. The following table reflects Contract assets and Advances on contracts: (In thousands) June 30, 2018 December 31, 2017 Contract assets: Current portion of contract assets $ 18,798 $ — Contract assets 3,566 — Total contract assets $ 22,364 $ — Advances on contracts: Current portion of advances on contracts $ 39,559 $ 117,958 Advances on contracts 13,493 — Total advances on contracts $ 53,052 $ 117,958 The increase in Contract assets and decrease in Advances on contracts is primarily attributable to the initial adoption of the FASB issued changes related to revenue recognition as well as the Altek acquisition. See Note 2, Recently Adopted and Recently Issued Accounting Standards for additional information. The Company provides assurance type warranties primarily for product sales in the Harsco Industrial and Harsco Rail Segments. These warranties are typically not priced or negotiated separately (there is no option to separately purchase the warranty) or the warranty does not provide customers with a service in addition to the assurance that the product complies with agreed-upon specifications. Accordingly, such warranties do not represent separate performance obligations. See Note 1, Summary of Significant Accounting Policies, to the Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 for additional information on warranties. The Company has elected to utilize the following practical expedients on an ongoing basis as part of the adoption: • The Company has not adjusted the promised amount of consideration for the effects of a significant financing component if the Company expects, at contract inception, that the period between when the Company transfers the promised good or services to the customer and when the customer pays for that good or service would be one year or less; and • The Company has elected to exclude disclosures related to unsatisfied performance obligations where the related contract has a duration of one year or less; or where the consideration is entirely variable. Accordingly, the Company's disclosure related to unsatisfied performance obligations is limited to the railway track maintenance equipment in the Harsco Rail Segment and the fixed portion of fees related to metals services in the Harsco Metals & Minerals Segment. Taxes assessed by governmental authorities that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from revenue. Additionally, in certain contracts, the Company facilitates shipping and handling activities after control has transferred to the customer. The Company has elected to record all shipping and handling activities as costs to fulfill a contract. In situations where the shipping and handling costs have not been incurred at the time revenue is recognized, the respective shipping and handling costs are accrued.

Other (Income) Expenses

Other (Income) Expenses	6 Months Ended
	Jun. 30, 2018
Other Income and Expenses [Abstract]
Other (Income) Expenses	Other (Income) Expenses, Net The major components of this Condensed Consolidated Statements of Operations caption are as follows: Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Employee termination benefit costs $ 769 $ 1,695 $ 2,212 $ 2,448 Net gains (a) (1,097 ) (88 ) (1,097 ) (210 ) Other costs to exit activities 100 247 464 347 Impaired asset write-downs 104 281 113 281 Other (756 ) (63 ) (750 ) 100 Other (income) expenses, net $ (880 ) $ 2,072 $ 942 $ 2,966 (a) Net gains result from the sales of redundant properties (primarily land, buildings and related equipment) and non-core assets. The caption, Other, above includes the adjustment to previously accrued amounts related to Other (income) expenses, net for which the ultimate settlement of such liability was less than previous estimates.

Components of Accumulated Other

Components of Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Components of Accumulated Other Comprehensive Loss	Components of Accumulated Other Comprehensive Loss Accumulated other comprehensive loss is included in the Condensed Consolidated Statements of Equity. The components of Accumulated other comprehensive loss, net of the effect of income taxes, and activity for the six months ended June 30, 2017 and 2018 was as follows: Components of Accumulated Other Comprehensive Income (Loss) - Net of Tax (In thousands) Cumulative Foreign Exchange Translation Adjustments Effective Portion of Derivatives Designated as Hedging Instruments Cumulative Unrecognized Actuarial Losses on Pension Obligations Unrealized Gain (Loss) on Marketable Securities Total Balance at December 31, 2016 $ (144,534 ) $ (1,089 ) $ (461,094 ) $ (5 ) $ (606,722 ) Other comprehensive income (loss) before reclassifications 26,386 (a) (913 ) (b) (19,185 ) (a) 6 6,294 Amounts reclassified from accumulated other comprehensive loss, net of tax — 185 10,042 — 10,227 Total other comprehensive income (loss) 26,386 (728 ) (9,143 ) 6 16,521 Other comprehensive loss attributable to noncontrolling interests (1,534 ) — — — (1,534 ) Other comprehensive income (loss) attributable to Harsco Corporation 24,852 (728 ) (9,143 ) 6 14,987 Balance at June 30, 2017 $ (119,682 ) $ (1,817 ) $ (470,237 ) $ 1 $ (591,735 ) Components of Accumulated Other Comprehensive Income (Loss) - Net of Tax (In thousands) Cumulative Foreign Exchange Translation Adjustments Effective Portion of Derivatives Designated as Hedging Instruments Cumulative Unrecognized Actuarial Losses on Pension Obligations Unrealized Gain (Loss) on Marketable Securities Total Balance at December 31, 2017 $ (111,567 ) $ 808 $ (435,840 ) $ 17 $ (546,582 ) Adoption of new accounting standard (c) — (1,520 ) — — (1,520 ) Balance at January 1, 2018 (111,567 ) (712 ) (435,840 ) 17 (548,102 ) Other comprehensive income (loss) before reclassifications (36,205 ) (a) 5,482 (b) 10,015 (a) (27 ) (20,735 ) Amounts reclassified from accumulated other comprehensive loss, net of tax — 97 9,611 — 9,708 Total other comprehensive income (loss) (36,205 ) 5,579 19,626 (27 ) (11,027 ) Other comprehensive income attributable to noncontrolling interests 1,240 — — — 1,240 Other comprehensive income (loss) attributable to Harsco Corporation (34,965 ) 5,579 19,626 (27 ) (9,787 ) Balance at June 30, 2018 $ (146,532 ) $ 4,867 $ (416,214 ) $ (10 ) $ (557,889 ) (a) Principally foreign currency fluctuation. (b) Net change from periodic revaluations. (c) Represents the opening balance sheet adjustment to retained earnings related to the adoption of the revenue recognition standard adopted by the Company on January 1, 2018. See Note 2, Recently Adopted and Recently Issued Accounting Standards, for additional details. Amounts reclassified from accumulated other comprehensive loss are as follows: (In thousands) Three Months Ended Six Months Ended Affected Caption in the Condensed Consolidated Statements of Operations June 30 June 30 June 30 June 30 Amortization of cash flow hedging instruments: Foreign currency exchange forward contracts $ 103 $ (189 ) $ (109 ) $ (189 ) Product revenues Foreign currency exchange forward contracts — 3 — 4 Cost of services and products sold Cross-currency interest rate swaps 377 251 648 493 Interest expense Interest rate swaps (235 ) — (235 ) — Interest expense Total before tax 245 65 304 308 Tax expense (57 ) (29 ) (207 ) (123 ) Total reclassification of cash flow hedging instruments, net of tax $ 188 $ 36 $ 97 $ 185 Amortization of defined benefit pension items (d) : Recognized losses $ 4,992 $ 5,512 $ 10,134 $ 10,979 Defined benefit pension income (expense) Recognized prior-service costs (37 ) 54 (76 ) 107 Defined benefit pension income (expense) Settlement/curtailment losses — — 166 — Defined benefit pension income (expense) Total before tax 4,955 5,566 10,224 11,086 Tax benefit (288 ) (522 ) (613 ) (1,044 ) Total reclassification of defined benefit pension items, net of tax $ 4,667 $ 5,044 $ 9,611 $ 10,042 (d) These accumulated other comprehensive loss components are included in the computation of net periodic pension costs. See Note 8, Employee Benefit Plans, for additional details.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Harsco Corporation (the "Company") has prepared these unaudited condensed consolidated financial statements in accordance with accounting principles generally accepted in the U.S. (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (the “SEC”). Accordingly, the unaudited condensed consolidated financial statements do not include all of the information and disclosure required by U.S. GAAP for annual financial statements. The December 31, 2017 Condensed Consolidated Balance Sheet information contained in this Quarterly Report on Form 10-Q was derived from the 2017 audited consolidated financial statements. The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements, including the notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . In the opinion of management, all adjustments (all of which are of a normal recurring nature) that are necessary for a fair statement are reflected in the unaudited condensed consolidated financial statements. Operating results and cash flows for the three and six months ended June 30, 2018 are not indicative of the results that may be expected for the year ending December 31, 2018 .
Reclassifications	Reclassifications Certain reclassifications have been made to prior year amounts to conform with current year classifications.
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted and Recently Issued Accounting Standards The following accounting standards have been adopted in 2018: On January 1, 2018, the Company adopted changes, with subsequent amendments, issued by the Financial Accounting Standards Board ("FASB") related to the recognition of revenue from contracts with customers. The changes clarify the principles for recognizing revenue and develop a common revenue standard. The core principle of the changes is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The adoption of these changes resulted in the following modifications to the Company's revenue recognition process: • Harsco Industrial Segment - The timing of revenue recognition for air-cooled heat exchanger sales, which the Company historically recognized upon the completion of the efforts associated with these arrangements, is now recognized over time with the impact of increasing revenue in earlier periods. This change also impacted the Company's Condensed Consolidated Balance Sheets by decreasing both Inventories and Advances on contracts; and creating a new caption and establishing a balance related to Contract assets. • Harsco Rail Segment - The timing of revenue recognition for certain railway track maintenance equipment sales, which the Company historically recognized upon the completion of the efforts associated with these arrangements, is now recognized over time with the impact of increasing revenue in earlier periods. This change also impacted the Company's Condensed Consolidated Balance Sheets by decreasing both Inventories and Advances on contracts; and creating a new caption and establishing a balance related to Contract assets. In addition, certain advance payments received from customers, which provide a significant benefit of financing and are expected to be outstanding longer than twelve months, are treated as significant financing components to the related transactions and the Company will increase the overall transaction price with a corresponding increase in interest expense. Additionally, the Company's disclosure related to revenue recognition has been expanded in accordance with the FASB changes. Please refer to Note 14, Revenue Recognition for additional information. The Company chose to implement the impact of the FASB changes utilizing the modified retrospective transition method, using the following practical expedients: • The Company has elected to apply the changes only to revenue arrangements that were not completed as of January 1, 2018; and • The Company has elected to reflect the aggregate effect of all contract modifications that occurred prior to the beginning of the earliest reported period when (i) identifying the satisfied and unsatisfied performance obligations; (ii) determining the transaction price; and (iii) allocating the transaction price to the satisfied and unsatisfied performance obligations. Comparative information has not been restated and continues to be reported under U.S. GAAP in effect for those periods. The cumulative effect of the changes made to the Condensed Consolidated Balance Sheet at January 1, 2018 was as follows: (In thousands) Balance at December 31, 2017 Impact of Adoption Balance at January 1, 2018 ASSETS Current assets: Trade accounts receivable, net $ 288,034 $ 532 $ 288,566 Inventories 178,293 (59,793 ) 118,500 Current portion of contract assets — 18,248 18,248 Other current assets 39,332 179 39,511 Total current assets 592,092 (40,834 ) 551,258 Contract assets — 3,566 3,566 Other assets 15,263 1,337 16,600 Total assets 1,578,685 (35,931 ) 1,542,754 LIABILITIES Current liabilities: Current portion of advances on contracts 117,958 (78,507 ) 39,451 Other current liabilities 133,368 13,995 147,363 Total current liabilities 474,128 (64,512 ) 409,616 Advances on contracts — 24,564 24,564 Other liabilities 40,846 1,580 42,426 Total liabilities 1,363,520 (38,368 ) 1,325,152 HARSCO CORPORATION STOCKHOLDERS' EQUITY Accumulated other comprehensive loss (546,582 ) (1,520 ) (548,102 ) Retained earnings 1,157,801 3,957 1,161,758 Total Harsco Corporation stockholders' equity 170,451 2,437 172,888 Total equity 215,165 2,437 217,602 Total liabilities and equity 1,578,685 (35,931 ) 1,542,754 The impact of modifying the Company's Condensed Consolidated Balance Sheet at June 30, 2018 is as follows: June 30, 2018 (In thousands) As Reported Impact of Adoption As Reported - Less Impact of Adoption ASSETS Current assets: Trade accounts receivable, net $ 295,390 $ 271 $ 295,661 Inventories 130,871 78,533 209,404 Current portion of contract assets 18,798 (18,798 ) — Other current assets 44,562 (174 ) 44,388 Total current assets 584,057 59,832 643,889 Contract assets 3,566 (3,566 ) — Deferred income tax assets 42,387 959 43,346 Other assets 19,394 (1,231 ) 18,163 Total assets 1,611,412 55,994 1,667,406 June 30, 2018 (In thousands) As Reported Impact of Adoption As Reported - Less Impact of Adoption LIABILITIES Current liabilities: Current portion of advances on contracts 39,559 79,991 119,550 Other current liabilities 130,577 (8,727 ) 121,850 Total current liabilities 381,306 71,264 452,570 Advances on contracts 13,493 (13,493 ) — Other liabilities 48,821 (301 ) 48,520 Total liabilities 1,345,259 57,470 1,402,729 HARSCO CORPORATION STOCKHOLDERS' EQUITY Accumulated other comprehensive loss (557,889 ) 1,623 (556,266 ) Retained earnings 1,219,992 (3,079 ) 1,216,913 Total Harsco Corporation stockholders' equity 223,732 (1,456 ) 222,276 Noncontrolling interests 42,421 (20 ) 42,401 Total equity 266,153 (1,476 ) 264,677 Total liabilities and equity 1,611,412 55,994 1,667,406 The impact of modifying the Company's Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2018 are as follows: Three Months Ended June 30, 2018 (In thousands, except per share amounts) As Reported Impact of Adoption As Reported - Less Impact of Adoption Revenues from continuing operations: Services revenues $ 257,963 $ 2,321 $ 260,284 Product revenues 174,009 (8,406 ) 165,603 Total revenues 431,972 (6,085 ) 425,887 Costs and expenses from continuing operations: Costs of services sold 195,906 1,349 197,255 Costs of products sold 122,976 (8,182 ) 114,794 Selling, general and administrative costs 58,927 21 58,948 Total costs and expenses 378,347 (6,812 ) 371,535 Operating income from continuing operations 53,625 727 54,352 Interest expense (9,993 ) 451 (9,542 ) Income from continuing operations before income taxes 44,079 1,178 45,257 Income tax expense (1,944 ) 12 (1,932 ) Income from continuing operations 42,135 1,190 43,325 Net income 42,711 1,190 43,901 Less: Net income attributable to noncontrolling interests (2,222 ) 2 (2,220 ) Net income attributable to Harsco Corporation 40,489 1,192 41,681 Amounts attributable to Harsco Corporation common stockholders: Income from continuing operations, net of tax 39,913 1,192 41,105 Net income attributable to Harsco Corporation common stockholders 40,489 1,192 41,681 Basic earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.49 0.01 0.50 Basic earnings per share attributable to Harsco Corporation common stockholders 0.50 0.01 0.51 Diluted earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.48 0.01 0.49 Diluted earnings per share attributable to Harsco Corporation common stockholders 0.48 0.01 0.49 Six Months Ended June 30, 2018 (In thousands, except per share amounts) As Reported Impact of Adoption As Reported - Less Impact of Adoption Revenues from continuing operations: Services revenues $ 512,925 $ 3,671 $ 516,596 Product revenues 327,085 (18,858 ) 308,227 Total revenues 840,010 (15,187 ) 824,823 Costs and expenses from continuing operations: Costs of services sold 395,279 2,707 397,986 Costs of products sold 234,956 (18,112 ) 216,844 Selling, general and administrative costs 116,010 37 116,047 Total costs and expenses 749,844 (15,368 ) 734,476 Operating income from continuing operations 90,166 181 90,347 Interest expense (19,576 ) 903 (18,673 ) Income from continuing operations before income taxes 72,374 1,084 73,458 Income tax expense (10,210 ) 4 (10,206 ) Income from continuing operations 62,164 1,088 63,252 Net income 62,288 1,088 63,376 Less: Net income attributable to noncontrolling interests (3,991 ) 2 (3,989 ) Net income attributable to Harsco Corporation 58,297 1,090 59,387 Amounts attributable to Harsco Corporation common stockholders: Income from continuing operations, net of tax 58,173 1,090 59,263 Net income attributable to Harsco Corporation common stockholders 58,297 1,090 59,387 Basic earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.72 0.01 0.73 Basic earnings per share attributable to Harsco Corporation common stockholders 0.72 0.01 0.73 Diluted earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.70 0.01 0.71 Diluted earnings per share attributable to Harsco Corporation common stockholders 0.70 0.01 0.71 The impact of modifying the Company's Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2018 is as follows: Six Months Ended June 30, 2018 (In thousands) As Reported Impact of Adoption As Reported - Less Impact of Adoption Cash flows from operating activities: Net income $ 62,288 $ 1,088 $ 63,376 Adjustments to reconcile net income to net cash used by operating activities: Deferred income tax expense (benefit) 340 (4 ) 336 Changes in assets and liabilities: Accounts receivable (21,445 ) (797 ) (22,242 ) Inventories (11,175 ) (22,661 ) (33,836 ) Contract assets (1,393 ) 1,393 — Advances on contracts (13,116 ) 15,966 2,850 Other assets and liabilities (11,334 ) 5,015 (6,319 ) Net cash used by operating activities 46,699 — 46,699 On January 1, 2018, the Company adopted changes issued by the FASB related to how employers that sponsor defined benefit pension plans and other postretirement plans present the net periodic pension cost ("NPPC") in the statement of operations. Employers are required to report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. Other components of NPPC are required to be presented in the statement of operations separately from the service cost component and outside of the subtotal of income from operations. The changes also allow only the service cost component to be eligible for capitalization. The adoption of these changes resulted in the Company reclassifying $0.7 million and $1.4 million of NPPC expense for the three months and six months ended June 30, 2017, respectively, from the captions Cost of services sold; Cost of products sold; and Selling, general and administrative expenses to the new caption, Defined benefit pension income (expense) in the Company's Condensed Consolidated Statements of Operations. On January 1, 2018, the Company adopted changes issued by the FASB clarifying when revisions to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The changes require modification accounting only in circumstances when the terms or conditions result in changes to the fair value, vesting conditions or classification of the award as an equity instrument or a liability. The adoption of these changes did not have an impact on the Company's condensed consolidated financial statements. On January 1, 2018, the Company adopted changes issued by FASB which eliminate the requirement to defer the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. Under the new guidance, an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The changes resulted in an adjustment to opening retained earnings of less than $0.1 million . The following accounting standards have been issued and become effective for the Company at a future date: In February 2016, the FASB issued changes in accounting for leases, which become effective for the Company on January 1, 2019. The changes introduce a lessee model that brings most leases onto the balance sheet, which will result in an increase in lease-related assets and liabilities. The changes also align many of the underlying principles of the new lessor model with those in the FASB’s new revenue recognition standard. Furthermore, the changes address other concerns related to the current leases model such as eliminating the requirement in current guidance for an entity to use bright-line tests in determining lease classification. The changes also require lessors to increase the transparency of their exposure to changes in value of their residual assets and how they manage that exposure. The Company is currently assessing existing leasing agreements, evaluating the practical expedients available upon adoption and assessing the impact of the changes on current accounting policies. In addition, the Company is in the process of identifying changes to current business processes and internal controls to support the reporting and disclosure requirements of the new standard. The impact on the consolidation financial statements is currently being evaluated. In January 2017, the FASB issued changes that remove the second step of the annual goodwill impairment test, which requires a hypothetical purchase price allocation. The changes provide that the amount of goodwill impairment will be equal to the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance remains largely unchanged. The same one-step impairment test will be applied to goodwill at all reporting units, even those with zero or negative carrying amounts. Entities will be required to disclose the amount of goodwill at reporting units with zero or negative carrying amounts. The changes become effective for the Company on January 1, 2020. Management has determined that these changes will not have a material impact on the Company's condensed consolidated financial statements. However, should the Company be required to record a goodwill impairment charge in future periods, the amount recorded may differ compared to any amounts that might be recorded under current practice. In August 2017, the FASB issued changes which expand and refine hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedged items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. The amendments in this update should be applied to hedging relationships existing on the date of adoption, which includes a cumulative-effect adjustment to eliminate any ineffectiveness recorded to accumulated other comprehensive income or loss with a corresponding adjustment to the opening balance of retained earnings as of the beginning of the fiscal year in which adoption occurred. Presentation and disclosure amendments are required to be applied prospectively. The changes become effective for the Company on January 1, 2019. Management is currently evaluating the impact of these changes on its condensed consolidated financial statements. In February 2018, the FASB issued changes which allow entities to reclassify stranded income tax effects resulting from the Tax Cuts and Jobs Act (the “Act”) from accumulated other comprehensive income to retained earnings in their consolidated financial statements. Under the Act, deferred taxes were adjusted to reflect the reduction of the historical corporate income tax rate to the newly enacted corporate income tax rate, which left the tax effects on items within accumulated other comprehensive income stranded at historical tax rates. The changes become effective for the Company on January 1, 2019. The Company had approximately $21 million of stranded income tax effects in accumulated other comprehensive income at December 31, 2017 resulting from the Act which the Company plans to reclassify upon initial adoption of these changes.

Recently Adopted and Recently26

Recently Adopted and Recently Issued Accounting Standards (Tables)	6 Months Ended
	Jun. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The cumulative effect of the changes made to the Condensed Consolidated Balance Sheet at January 1, 2018 was as follows: (In thousands) Balance at December 31, 2017 Impact of Adoption Balance at January 1, 2018 ASSETS Current assets: Trade accounts receivable, net $ 288,034 $ 532 $ 288,566 Inventories 178,293 (59,793 ) 118,500 Current portion of contract assets — 18,248 18,248 Other current assets 39,332 179 39,511 Total current assets 592,092 (40,834 ) 551,258 Contract assets — 3,566 3,566 Other assets 15,263 1,337 16,600 Total assets 1,578,685 (35,931 ) 1,542,754 LIABILITIES Current liabilities: Current portion of advances on contracts 117,958 (78,507 ) 39,451 Other current liabilities 133,368 13,995 147,363 Total current liabilities 474,128 (64,512 ) 409,616 Advances on contracts — 24,564 24,564 Other liabilities 40,846 1,580 42,426 Total liabilities 1,363,520 (38,368 ) 1,325,152 HARSCO CORPORATION STOCKHOLDERS' EQUITY Accumulated other comprehensive loss (546,582 ) (1,520 ) (548,102 ) Retained earnings 1,157,801 3,957 1,161,758 Total Harsco Corporation stockholders' equity 170,451 2,437 172,888 Total equity 215,165 2,437 217,602 Total liabilities and equity 1,578,685 (35,931 ) 1,542,754 The impact of modifying the Company's Condensed Consolidated Balance Sheet at June 30, 2018 is as follows: June 30, 2018 (In thousands) As Reported Impact of Adoption As Reported - Less Impact of Adoption ASSETS Current assets: Trade accounts receivable, net $ 295,390 $ 271 $ 295,661 Inventories 130,871 78,533 209,404 Current portion of contract assets 18,798 (18,798 ) — Other current assets 44,562 (174 ) 44,388 Total current assets 584,057 59,832 643,889 Contract assets 3,566 (3,566 ) — Deferred income tax assets 42,387 959 43,346 Other assets 19,394 (1,231 ) 18,163 Total assets 1,611,412 55,994 1,667,406 June 30, 2018 (In thousands) As Reported Impact of Adoption As Reported - Less Impact of Adoption LIABILITIES Current liabilities: Current portion of advances on contracts 39,559 79,991 119,550 Other current liabilities 130,577 (8,727 ) 121,850 Total current liabilities 381,306 71,264 452,570 Advances on contracts 13,493 (13,493 ) — Other liabilities 48,821 (301 ) 48,520 Total liabilities 1,345,259 57,470 1,402,729 HARSCO CORPORATION STOCKHOLDERS' EQUITY Accumulated other comprehensive loss (557,889 ) 1,623 (556,266 ) Retained earnings 1,219,992 (3,079 ) 1,216,913 Total Harsco Corporation stockholders' equity 223,732 (1,456 ) 222,276 Noncontrolling interests 42,421 (20 ) 42,401 Total equity 266,153 (1,476 ) 264,677 Total liabilities and equity 1,611,412 55,994 1,667,406 The impact of modifying the Company's Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2018 are as follows: Three Months Ended June 30, 2018 (In thousands, except per share amounts) As Reported Impact of Adoption As Reported - Less Impact of Adoption Revenues from continuing operations: Services revenues $ 257,963 $ 2,321 $ 260,284 Product revenues 174,009 (8,406 ) 165,603 Total revenues 431,972 (6,085 ) 425,887 Costs and expenses from continuing operations: Costs of services sold 195,906 1,349 197,255 Costs of products sold 122,976 (8,182 ) 114,794 Selling, general and administrative costs 58,927 21 58,948 Total costs and expenses 378,347 (6,812 ) 371,535 Operating income from continuing operations 53,625 727 54,352 Interest expense (9,993 ) 451 (9,542 ) Income from continuing operations before income taxes 44,079 1,178 45,257 Income tax expense (1,944 ) 12 (1,932 ) Income from continuing operations 42,135 1,190 43,325 Net income 42,711 1,190 43,901 Less: Net income attributable to noncontrolling interests (2,222 ) 2 (2,220 ) Net income attributable to Harsco Corporation 40,489 1,192 41,681 Amounts attributable to Harsco Corporation common stockholders: Income from continuing operations, net of tax 39,913 1,192 41,105 Net income attributable to Harsco Corporation common stockholders 40,489 1,192 41,681 Basic earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.49 0.01 0.50 Basic earnings per share attributable to Harsco Corporation common stockholders 0.50 0.01 0.51 Diluted earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.48 0.01 0.49 Diluted earnings per share attributable to Harsco Corporation common stockholders 0.48 0.01 0.49 Six Months Ended June 30, 2018 (In thousands, except per share amounts) As Reported Impact of Adoption As Reported - Less Impact of Adoption Revenues from continuing operations: Services revenues $ 512,925 $ 3,671 $ 516,596 Product revenues 327,085 (18,858 ) 308,227 Total revenues 840,010 (15,187 ) 824,823 Costs and expenses from continuing operations: Costs of services sold 395,279 2,707 397,986 Costs of products sold 234,956 (18,112 ) 216,844 Selling, general and administrative costs 116,010 37 116,047 Total costs and expenses 749,844 (15,368 ) 734,476 Operating income from continuing operations 90,166 181 90,347 Interest expense (19,576 ) 903 (18,673 ) Income from continuing operations before income taxes 72,374 1,084 73,458 Income tax expense (10,210 ) 4 (10,206 ) Income from continuing operations 62,164 1,088 63,252 Net income 62,288 1,088 63,376 Less: Net income attributable to noncontrolling interests (3,991 ) 2 (3,989 ) Net income attributable to Harsco Corporation 58,297 1,090 59,387 Amounts attributable to Harsco Corporation common stockholders: Income from continuing operations, net of tax 58,173 1,090 59,263 Net income attributable to Harsco Corporation common stockholders 58,297 1,090 59,387 Basic earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.72 0.01 0.73 Basic earnings per share attributable to Harsco Corporation common stockholders 0.72 0.01 0.73 Diluted earnings per share attributable to Harsco Corporation common stockholders: Continuing operations 0.70 0.01 0.71 Diluted earnings per share attributable to Harsco Corporation common stockholders 0.70 0.01 0.71 The impact of modifying the Company's Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2018 is as follows: Six Months Ended June 30, 2018 (In thousands) As Reported Impact of Adoption As Reported - Less Impact of Adoption Cash flows from operating activities: Net income $ 62,288 $ 1,088 $ 63,376 Adjustments to reconcile net income to net cash used by operating activities: Deferred income tax expense (benefit) 340 (4 ) 336 Changes in assets and liabilities: Accounts receivable (21,445 ) (797 ) (22,242 ) Inventories (11,175 ) (22,661 ) (33,836 ) Contract assets (1,393 ) 1,393 — Advances on contracts (13,116 ) 15,966 2,850 Other assets and liabilities (11,334 ) 5,015 (6,319 ) Net cash used by operating activities 46,699 — 46,699

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Summary of consideration transferred
Summary of assets acquired and liabilities assumed	The fair value recorded for the assets acquired and liabilities assumed for Altek is as follows: Preliminary Valuation (In millions) May 29, 2018 Cash and cash equivalents $ 1.7 Net working capital (1.5 ) Property, plant and equipment 3.3 Intangible assets 52.5 Goodwill 20.9 Net deferred tax liabilities (8.5 ) Other liabilities (0.3 ) Total identifiable net assets of Altek $ 68.2
Summary of intangible assets and amortization periods	The following table details the preliminary valuation of identifiable intangible assets and amortization periods for the Altek Amortization Period Preliminary Valuation (Dollars in millions) May 29, 2018 Customer related 14.2 years $ 11.5 Technology related 10.3 years 36.5 Trade names 15.0 years 4.5 Total identifiable intangible assets of Altek $ 52.5

Accounts Receivable and Inven28

Accounts Receivable and Inventories (Tables)	6 Months Ended
	Jun. 30, 2018
Accounts Receivable And Inventories
Schedule of accounts receivable	Accounts receivable consist of the following: (In thousands) June 30 December 31 Trade accounts receivable $ 299,723 $ 292,765 Less: Allowance for doubtful accounts (4,333 ) (4,731 ) Trade accounts receivable, net $ 295,390 $ 288,034 Other receivables (a) $ 27,349 $ 20,224 (a) Other receivables include insurance claim receivables, employee receivables, tax claim receivables and other miscellaneous receivables not included in Trade accounts receivable, net.
Schedule of provision for doubtful accounts related to trade accounts receivable	The provision (benefit) for doubtful accounts related to trade accounts receivable was as follows: Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Provision (benefit) for doubtful accounts related to trade accounts receivable $ (110 ) $ 1,197 $ (156 ) $ 1,175
Schedule of inventories	Inventories consist of the following: (In thousands) June 30 December 31 Finished goods $ 21,463 $ 26,415 Work-in-process 18,777 24,367 Contracts-in-process (b) — 45,599 Raw materials and purchased parts 67,389 58,943 Stores and supplies 23,242 22,969 Total inventories $ 130,871 $ 178,293
Schedule of contracts-in-process	Contracts-in-process consist of the following: (In thousands) December 31 Contract costs accumulated to date $ 73,740 Estimated forward loss provisions for contracts-in-process (c) (28,141 ) Contracts-in-process (b) (d) $ 45,599 (b) The Company has adopted the new revenue recognition standard utilizing the modified retrospective transition method, including use of practical expedients. Amounts previously reported as Contracts-in-progress have been recognized through the related cumulative catch-up adjustment. See Note 2, Recently Adopted and Recently Issued Accounting Standards for additional information. (c) For periods prior to January 1, 2018, to the extent that the estimated forward loss provision exceeds accumulated contract costs it is included in the caption Other current liabilities on the Condensed Consolidated Balance Sheets and amounted to $3.0 million at December 31, 2017 . (d) At June 30, 2018 and December 31, 2017 , the Company has $39.9 million and $97.9 million , respectively, of net customer advances related to SBB contracts. These amounts are included in the caption Current portion of advances on contracts and Advances on contracts, representing the non-current portion, on the Condensed Consolidated Balance Sheets.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Schedule of property, plant and equipment	Property, plant and equipment consists of the following: (In thousands) June 30 December 31 Land $ 10,532 $ 10,840 Land improvements 16,117 14,996 Buildings and improvements 194,193 198,582 Machinery and equipment 1,571,753 1,599,713 Uncompleted construction 27,466 24,387 Gross property, plant and equipment 1,820,061 1,848,518 Less: Accumulated depreciation (1,358,155 ) (1,368,771 ) Property, plant and equipment, net $ 461,906 $ 479,747

Goodwill and Other Intangible30

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 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 six months ended June 30, 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 Changes to goodwill 20,942 (a) — — 20,942 Foreign currency translation (8,863 ) — — (8,863 ) Balance at June 30, 2018 $ 393,972 $ 6,839 $ 13,026 $ 413,837
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: June 30, 2018 December 31, 2017 (In thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Customer related (b) $ 161,149 $ 120,898 $ 153,014 $ 121,385 Patents 5,748 5,645 5,825 5,700 Technology related (b) 61,646 26,126 26,131 26,131 Trade names (b) 12,713 5,016 8,317 4,845 Other 8,748 6,054 8,875 5,850 Total $ 250,004 $ 163,739 $ 202,162 $ 163,911
Schedule of amortization expense	Amortization expense for intangible assets was as follows: Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Amortization expense for intangible assets $ 1,649 $ 1,280 $ 2,931 $ 2,598
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 (c) $ 7,900 $ 9,750 $ 9,250 $ 8,800 $ 8,500 (c) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange fluctuations

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Schedule of net benefit costs	Three Months Ended June 30 Defined Benefit Pension Plans Net Periodic Pension Cost U.S. Plans International Plans (In thousands) 2018 2017 2018 2017 Service costs $ 11 $ 11 $ 408 $ 406 Interest costs 2,390 2,470 5,442 5,773 Expected return on plan assets (3,017 ) (2,621 ) (10,696 ) (10,515 ) Recognized prior service costs — 8 (37 ) 46 Recognized loss 1,302 1,425 3,690 4,087 Defined benefit pension plans net periodic pension cost (benefit) $ 686 $ 1,293 $ (1,193 ) $ (203 ) Six Months Ended June 30 Defined Benefit Pension Plans Net Periodic Pension Cost U.S. Plans International Plans (In thousands) 2018 2017 2018 2017 Service costs $ 21 $ 22 $ 794 $ 817 Interest costs 4,781 4,939 11,114 11,507 Expected return on plan assets (6,034 ) (5,242 ) (21,841 ) (20,939 ) Recognized prior service costs — 16 (76 ) 91 Recognized loss 2,604 2,850 7,530 8,129 Settlement/curtailment losses 166 — — — Defined benefit pension plans net periodic pension cost (income) $ 1,538 $ 2,585 $ (2,479 ) $ (395 )
Schedule of contributions to pension plans	Three Months Ended Six Months Ended Company Contributions June 30 June 30 (In thousands) 2018 2017 2018 2017 Defined benefit pension plans (U.S.) $ 2,067 $ 471 $ 3,351 $ 942 Defined benefit pension plans (International) 3,239 2,963 12,973 11,300 Multiemployer pension plans 519 498 1,020 983 Defined contribution pension plans 2,747 2,468 5,582 5,028

Reconciliation of Basic and D32

Reconciliation of Basic and Diluted Shares (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Reconciliation of basic and diluted shares	Three Months Ended Six Months Ended June 30 June 30 (In thousands, except per share amounts) 2018 2017 2018 2017 Income from continuing operations attributable to Harsco Corporation common stockholders $ 39,913 $ 18,635 $ 58,173 $ 27,902 Weighted-average shares outstanding - basic 80,861 80,535 80,756 80,460 Dilutive effect of stock-based compensation 2,782 2,315 2,838 2,098 Weighted-average shares outstanding - diluted 83,643 82,850 83,594 82,558 Earnings from continuing operations per common share, attributable to Harsco Corporation common stockholders: Basic $ 0.49 $ 0.23 $ 0.72 $ 0.35 Diluted $ 0.48 $ 0.22 $ 0.70 $ 0.34
Schedule of antidilutive securities excluded from computation of earnings per share	The following average outstanding stock-based compensation units were not included in the computation of diluted earnings per share because the effect was antidilutive: Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Restricted stock units — — — — Stock options — 55 — 55 Stock appreciation rights 283 972 489 1,117 Performance share units — 176 — 320

Derivative Instruments, Hedgi33

Derivative Instruments, Hedging Activities and Fair Value (Tables)	6 Months Ended
	Jun. 30, 2018
Derivative Instruments, Hedging Activities And Fair Value Disclosure [Abstract]
Schedule of fair value of outstanding derivative contracts	The fair value of outstanding derivative contracts recorded as assets and liabilities on the Condensed Consolidated Balance Sheets was as follows: Asset Derivatives Liability Derivatives (In thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value June 30, 2018 Derivatives designated as hedging instruments: Foreign currency exchange forward contracts Other current assets $ 2,183 Other current liabilities $ 389 Interest rate swaps Other current assets 1,623 Interest rate swaps Other assets 3,142 Other liabilities $ 353 Total derivatives designated as hedging instruments $ 6,948 $ 742 Derivatives not designated as hedging instruments : Foreign currency exchange forward contracts Other current assets $ 11,567 Other current liabilities $ 2,415 Asset Derivatives Liability Derivatives (In thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value December 31, 2017 Derivatives designated as hedging instruments: Foreign currency exchange forward contracts Other current assets $ 2,329 Other current liabilities $ 153 Interest rate swaps Other current assets 464 Interest rate swaps Other assets 170 Other liabilities 1,368 Total derivatives designated as hedging instruments $ 2,963 $ 1,521 Derivatives not designated as hedging instruments : Foreign currency exchange forward contracts Other current assets $ 2,915 Other current liabilities $ 6,970
Schedule of effect of derivative instruments	The effect of derivative instruments in the Condensed Consolidated Statements of Operations and the Condensed Consolidated Statements of Comprehensive Income, was as follows: Derivatives Designated as Hedging Instruments (In thousands) Amount Recognized in Other Comprehensive Income (“OCI”) on Derivative - Effective Portion Location of Amount Reclassified from Accumulated OCI into Income - Effective Portion Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity Location of Amount Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing Amount Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing Three Months Ended June 30, 2018: Foreign currency exchange forward contracts $ 1,539 Product revenues $ 103 $ — Interest rate swaps 2,071 Interest expense (235 ) — Cross-currency interest rate swaps 93 (a) Interest expense 377 — $ 3,703 $ 245 $ — Three Months Ended June 30, 2017: Foreign currency exchange forward contracts $ 1,001 Product revenues/Cost of services and products sold $ (186 ) $ — Interest rate swaps (2,021 ) — — Cross-currency interest rate swaps 3 (a) Interest Expense 251 Cost of services and products sold (107 ) $ (1,017 ) $ 65 $ (107 ) (In thousands) Amount Recognized in OCI on Derivative - Effective Portion Location Amount Reclassified from Accumulated OCI into Income - Effective Portion Amount Reclassified from Accumulated OCI into Income - Effective Portion Location of Amount Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing Amount Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing Six Months Ended June 30, 2018: Foreign currency forward exchange contracts $ 1,779 Product revenues / Cost of services and products sold $ (109 ) $ — Foreign currency forward exchange contracts — Retained earnings (b) (1,520 ) — Interest rate swaps 5,381 Interest expense (235 ) — Cross currency interest rate swaps — Interest expense 648 — $ 7,160 $ (1,216 ) $ — Six Months Ended June 30, 2017: Foreign currency forward exchange contracts $ 763 Product revenues / Cost of services and products sold $ (185 ) $ — Interest rate swaps (2,543 ) — — Cross currency interest rate swaps (123 ) (a) Interest expense 493 Cost of services and products sold (317 ) $ (1,903 ) $ 308 $ (317 ) (a) Amounts represent changes in foreign currency translation related to balances in Accumulated other comprehensive loss. (b) The Company has adopted the new revenue recognition standard utilizing the modified retrospective transition method, including use of practical expedients. See Note 2, Recently Adopted and Recently Issued Accounting Standards for additional information. Derivatives Not Designated as Hedging Instruments Location of Gain (Loss) Recognized in Income on Derivative Amount of Gain (Loss) Recognized in Income on Derivative for the Three Months Ended June 30 (d) (In thousands) 2018 2017 Foreign currency exchange forward contracts Cost of services and products sold $ 15,731 $ (13,289 ) Location of Gain (Loss) Recognized in Income on Derivative Amount of Gain (Loss) Recognized in Income on Derivative for the Six Months Ended June 30 (d) (In thousands) 2018 2017 Foreign currency forward exchange contracts Cost of services and products sold $ 10,265 $ (11,739 ) (d) These gains (losses) offset amounts recognized in cost of services and products sold principally as a result of intercompany or third party foreign currency exposures.
Summary of notional amount of foreign currency exchange contracts and cross-currency interest rate swaps	The following tables summarize, by major currency, the contractual amounts of the Company’s foreign currency exchange forward contracts in U.S. dollars. The “Buy” amounts represent the U.S. dollar equivalent of commitments to purchase foreign currencies, and the “Sell” amounts represent the U.S. dollar equivalent of commitments to sell foreign currencies. The recognized gains and losses offset amounts recognized in cost of services and products sold principally as a result of intercompany or third party foreign currency exposures. Contracted Amounts of Foreign Currency Exchange Forward Contracts Outstanding at June 30, 2018 : (In thousands) Type U.S. Dollar Equivalent Maturity Recognized Gain (Loss) British pounds sterling Sell $ 96,546 July 2018 through October 2021 $ 3,024 British pounds sterling Buy 9,590 July 2018 through January 2019 (157 ) Euros Sell 306,503 July 2018 through March 2019 8,258 Euros Buy 192,929 July 2018 through November 2018 (1,435 ) Other currencies Sell 41,096 July 2018 through December 2018 1,296 Other currencies Buy 2,901 July 2018 (40 ) Total $ 649,565 $ 10,946 Contracted Amounts of Foreign Currency Exchange Forward Contracts Outstanding at December 31, 2017 : (In thousands) Type U.S. Dollar Equivalent Maturity Recognized Gain (Loss) British pounds sterling Sell $ 76,761 January 2018 $ (769 ) British pounds sterling Buy 5,960 January 2018 72 Euros Sell 314,649 January 2018 through December 2018 (4,916 ) Euros Buy 223,111 January 2018 through November 2018 4,564 Other currencies Sell 39,889 January 2018 through June 2018 (1,049 ) Other currencies Buy 11,487 January 2018 219 Total $ 671,857 $ (1,879 ) The following table indicates the notional amounts of the Company's interest rate swaps at June 30, 2018 : Annual Notional Amount Interest Rates (In millions) Receive Pay Maturing 2018 through 2022 $ 300.0 Floating U.S. dollar rate Fixed U.S. dollar rate
Schedule of fair value of financial instruments	The following table indicates the fair value hierarchy of the financial instruments of the Company: Level 2 Fair Value Measurements (In thousands) June 30 December 31 Assets Foreign currency exchange forward contracts $ 13,750 $ 5,244 Interest rate swaps 4,765 634 Liabilities Foreign currency exchange forward contracts 2,804 7,123 Interest rate swaps 353 1,368
Schedule of the reconciliation of liabilities measured on a recurring basis using unobservable inputs

Review of Operations by Segme34

Review of Operations by Segment (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Schedule of operations by segment	Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Revenues From Continuing Operations Harsco Metals & Minerals $ 272,320 $ 259,306 $ 537,043 $ 506,340 Harsco Industrial 92,065 73,563 175,663 139,448 Harsco Rail 67,552 61,994 127,230 121,582 Corporate 35 35 74 69 Total Revenues From Continuing Operations $ 431,972 $ 394,898 $ 840,010 $ 767,439 Operating Income From Continuing Operations Harsco Metals & Minerals $ 35,661 $ 31,464 $ 63,396 $ 57,221 Harsco Industrial 14,170 9,240 26,591 12,134 Harsco Rail 8,618 8,192 10,570 14,409 Corporate (4,824 ) (5,747 ) (10,391 ) (12,008 ) Total Operating Income From Continuing Operations $ 53,625 $ 43,149 $ 90,166 $ 71,756 Depreciation and Amortization Harsco Metals & Minerals $ 28,632 $ 27,928 $ 57,717 $ 55,808 Harsco Industrial 1,882 1,843 3,737 3,683 Harsco Rail 1,039 1,025 2,103 2,062 Corporate 1,666 1,479 3,014 2,950 Total Depreciation and Amortization $ 33,219 $ 32,275 $ 66,571 $ 64,503 Capital Expenditures Harsco Metals & Minerals $ 24,423 $ 21,599 $ 49,599 $ 37,071 Harsco Industrial 2,916 796 4,003 1,548 Harsco Rail 2,088 1,083 2,518 1,303 Corporate 172 233 376 778 Total Capital Expenditures $ 29,599 $ 23,711 $ 56,496 $ 40,700
Reconciliation of segment operating income to income from continuing operations before income taxes and equity income	Reconciliation of Segment Operating Income to Income From Continuing Operations Before Income Taxes Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Segment operating income $ 58,449 $ 48,896 $ 100,557 $ 83,764 General Corporate expense (4,824 ) (5,747 ) (10,391 ) (12,008 ) Operating income from continuing operations 53,625 43,149 90,166 71,756 Interest income 577 493 1,075 1,005 Interest expense (9,993 ) (12,405 ) (19,576 ) (24,058 ) Defined benefit pension income (expense) 904 (675 ) 1,743 (1,374 ) Loss on early extinguishment of debt (1,034 ) — (1,034 ) — Income from continuing operations before income taxes $ 44,079 $ 30,562 $ 72,374 $ 47,329

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Summary of revenues by primary geographical markets	A summary of the Company's revenues by primary geographical markets as well as by key product and service groups is as follows: Three Months Ended June 30, 2018 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) : North America $ 79,862 $ 87,174 $ 47,547 $ 35 $ 214,618 Western Europe 97,410 — 13,041 — 110,451 Latin America (b) 37,388 4,891 1,331 — 43,610 Asia-Pacific 37,788 — 5,633 — 43,421 Middle East and Africa 12,150 — — — 12,150 Eastern Europe 7,722 — — — 7,722 Total Revenues (c) $ 272,320 $ 92,065 $ 67,552 $ 35 $ 431,972 Three Months Ended June 30, 2018 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Key Product and Service Groups: On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products $ 272,320 $ — $ — $ — $ 272,320 Railway track maintenance services and equipment — — 67,552 — 67,552 Air-cooled heat exchangers — 48,576 — — 48,576 Industrial grating and fencing products — 32,446 — — 32,446 Heat transfer products — 11,043 — — 11,043 General Corporate — — — 35 35 Total Revenues (c) $ 272,320 $ 92,065 $ 67,552 $ 35 $ 431,972 Three Months Ended June 30, 2017 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) : North America $ 70,759 $ 67,165 $ 48,748 $ 35 $ 186,707 Western Europe 97,516 — 6,832 — 104,348 Latin America (b) 39,758 5,308 778 — 45,844 Asia-Pacific 34,759 1,090 5,636 — 41,485 Middle East and Africa 9,953 — — — 9,953 Eastern Europe 6,561 — — — 6,561 Total Revenues (c) $ 259,306 $ 73,563 $ 61,994 $ 35 $ 394,898 Key Product and Service Groups: On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products $ 259,306 $ — $ — $ — $ 259,306 Railway track maintenance services and equipment — — 61,994 — 61,994 Air-cooled heat exchangers — 33,774 — — 33,774 Industrial grating and fencing products — 29,134 — — 29,134 Heat transfer products — 10,655 — — 10,655 General Corporate — — — 35 35 Total Revenues (c) $ 259,306 $ 73,563 $ 61,994 $ 35 $ 394,898 Six Months Ended June 30, 2018 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) : North America $ 150,927 $ 166,032 $ 87,952 $ 74 $ 404,985 Western Europe 194,331 — 27,761 — 222,092 Latin America (b) 78,846 9,631 2,164 — 90,641 Asia-Pacific 74,009 — 9,353 — 83,362 Middle East and Africa 23,703 — — — 23,703 Eastern Europe 15,227 — — — 15,227 Total Revenues (c) $ 537,043 $ 175,663 $ 127,230 $ 74 $ 840,010 Six Months Ended June 30, 2018 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Key Product and Service Groups: On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products $ 537,043 $ — $ — $ — $ 537,043 Railway track maintenance services and equipment — — 127,230 — 127,230 Air-cooled heat exchangers — 92,843 — — 92,843 Industrial grating and fencing products — 62,543 — — 62,543 Heat transfer products — 20,277 — — 20,277 General Corporate — — — 74 74 Total Revenues (c) $ 537,043 $ 175,663 $ 127,230 $ 74 $ 840,010 Six Months Ended June 30, 2017 (In thousands) Harsco Metals & Minerals Segment Harsco Industrial Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) : North America $ 137,992 $ 125,516 $ 93,898 $ 69 $ 357,475 Western Europe 189,236 — 16,371 — 205,607 Latin America (b) 77,778 11,890 1,254 — 90,922 Asia-Pacific 67,316 2,042 10,059 — 79,417 Middle East and Africa 20,509 — — — 20,509 Eastern Europe 13,509 — — — 13,509 Total Revenues (c) $ 506,340 $ 139,448 $ 121,582 $ 69 $ 767,439 Key Product and Service Groups: On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products $ 506,340 $ — $ — $ — $ 506,340 Railway track maintenance services and equipment — — 121,582 — 121,582 Air-cooled heat exchangers — 64,235 — — 64,235 Industrial grating and fencing products — 57,293 — — 57,293 Heat transfer products — 17,920 — — 17,920 General Corporate — — — 69 69 Total Revenues (c) $ 506,340 $ 139,448 $ 121,582 $ 69 $ 767,439 (a) Revenues are attributed to individual countries based on the location of the facility generating the revenue. (b) Includes Mexico. (c) The Company has adopted the new revenue recognition standard utilizing the modified retrospective transition method, including use of practical expedients. Comparative information has not been restated and continues to be reported under U.S. GAAP in effect for those periods. See Note 2, Recently Adopted and Recently Issued Accounting Standards for additional information.
Summary of contract assets and advances on contracts	The following table reflects Contract assets and Advances on contracts: (In thousands) June 30, 2018 December 31, 2017 Contract assets: Current portion of contract assets $ 18,798 $ — Contract assets 3,566 — Total contract assets $ 22,364 $ — Advances on contracts: Current portion of advances on contracts $ 39,559 $ 117,958 Advances on contracts 13,493 — Total advances on contracts $ 53,052 $ 117,958

Other (Income) Expenses (Tables

Other (Income) Expenses (Tables)	6 Months Ended
	Jun. 30, 2018
Other Income and Expenses [Abstract]
Schedule of other (income) expenses	The major components of this Condensed Consolidated Statements of Operations caption are as follows: Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2018 2017 2018 2017 Employee termination benefit costs $ 769 $ 1,695 $ 2,212 $ 2,448 Net gains (a) (1,097 ) (88 ) (1,097 ) (210 ) Other costs to exit activities 100 247 464 347 Impaired asset write-downs 104 281 113 281 Other (756 ) (63 ) (750 ) 100 Other (income) expenses, net $ (880 ) $ 2,072 $ 942 $ 2,966 (a) Net gains result from the sales of redundant properties (primarily land, buildings and related equipment) and non-core assets.

Components of Accumulated Oth37

Components of Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of Accumulated other comprehensive loss, net of the effect of income taxes, and activity for the six months ended June 30, 2017 and 2018 was as follows: Components of Accumulated Other Comprehensive Income (Loss) - Net of Tax (In thousands) Cumulative Foreign Exchange Translation Adjustments Effective Portion of Derivatives Designated as Hedging Instruments Cumulative Unrecognized Actuarial Losses on Pension Obligations Unrealized Gain (Loss) on Marketable Securities Total Balance at December 31, 2016 $ (144,534 ) $ (1,089 ) $ (461,094 ) $ (5 ) $ (606,722 ) Other comprehensive income (loss) before reclassifications 26,386 (a) (913 ) (b) (19,185 ) (a) 6 6,294 Amounts reclassified from accumulated other comprehensive loss, net of tax — 185 10,042 — 10,227 Total other comprehensive income (loss) 26,386 (728 ) (9,143 ) 6 16,521 Other comprehensive loss attributable to noncontrolling interests (1,534 ) — — — (1,534 ) Other comprehensive income (loss) attributable to Harsco Corporation 24,852 (728 ) (9,143 ) 6 14,987 Balance at June 30, 2017 $ (119,682 ) $ (1,817 ) $ (470,237 ) $ 1 $ (591,735 ) Components of Accumulated Other Comprehensive Income (Loss) - Net of Tax (In thousands) Cumulative Foreign Exchange Translation Adjustments Effective Portion of Derivatives Designated as Hedging Instruments Cumulative Unrecognized Actuarial Losses on Pension Obligations Unrealized Gain (Loss) on Marketable Securities Total Balance at December 31, 2017 $ (111,567 ) $ 808 $ (435,840 ) $ 17 $ (546,582 ) Adoption of new accounting standard (c) — (1,520 ) — — (1,520 ) Balance at January 1, 2018 (111,567 ) (712 ) (435,840 ) 17 (548,102 ) Other comprehensive income (loss) before reclassifications (36,205 ) (a) 5,482 (b) 10,015 (a) (27 ) (20,735 ) Amounts reclassified from accumulated other comprehensive loss, net of tax — 97 9,611 — 9,708 Total other comprehensive income (loss) (36,205 ) 5,579 19,626 (27 ) (11,027 ) Other comprehensive income attributable to noncontrolling interests 1,240 — — — 1,240 Other comprehensive income (loss) attributable to Harsco Corporation (34,965 ) 5,579 19,626 (27 ) (9,787 ) Balance at June 30, 2018 $ (146,532 ) $ 4,867 $ (416,214 ) $ (10 ) $ (557,889 ) (a) Principally foreign currency fluctuation. (b) Net change from periodic revaluations.
Reclassification out of Accumulated Other Comprehensive Income	Amounts reclassified from accumulated other comprehensive loss are as follows: (In thousands) Three Months Ended Six Months Ended Affected Caption in the Condensed Consolidated Statements of Operations June 30 June 30 June 30 June 30 Amortization of cash flow hedging instruments: Foreign currency exchange forward contracts $ 103 $ (189 ) $ (109 ) $ (189 ) Product revenues Foreign currency exchange forward contracts — 3 — 4 Cost of services and products sold Cross-currency interest rate swaps 377 251 648 493 Interest expense Interest rate swaps (235 ) — (235 ) — Interest expense Total before tax 245 65 304 308 Tax expense (57 ) (29 ) (207 ) (123 ) Total reclassification of cash flow hedging instruments, net of tax $ 188 $ 36 $ 97 $ 185 Amortization of defined benefit pension items (d) : Recognized losses $ 4,992 $ 5,512 $ 10,134 $ 10,979 Defined benefit pension income (expense) Recognized prior-service costs (37 ) 54 (76 ) 107 Defined benefit pension income (expense) Settlement/curtailment losses — — 166 — Defined benefit pension income (expense) Total before tax 4,955 5,566 10,224 11,086 Tax benefit (288 ) (522 ) (613 ) (1,044 ) Total reclassification of defined benefit pension items, net of tax $ 4,667 $ 5,044 $ 9,611 $ 10,042 (d) These accumulated other comprehensive loss components are included in the computation of net periodic pension costs. See Note 8, Employee Benefit Plans, for additional details.
Reclassification from accumulated other comprehensive loss in connection with loss on dilution of equity investment

Recently Adopted and Recently38

Recently Adopted and Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined benefit pension income (expense)	$ (904)	$ 675	$ (1,743)	$ 1,374
Adoption of new accounting standard (See Note 2)					$ 2,374	$ 397
Income tax expense	1,944	$ 11,234	10,210	$ 17,487
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of new accounting standard (See Note 2)	$ 100		$ 100		$ 3,894	$ (709)

Recently Adopted and Recently39

Recently Adopted and Recently Issued Accounting Standards (Details 1) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Trade accounts receivable, net	$ 295,390	$ 288,566	$ 288,034
Inventories	130,871	118,500	178,293
Current portion of contract assets	18,798	18,248	0
Other current assets	44,562	39,511	39,332
Total current assets	584,057	551,258	592,092
Contract assets	3,566	3,566	0
Deferred income tax assets	42,387		51,574
Other assets	19,394	16,600	15,263
Total assets	1,611,412	1,542,754	1,578,685
Current liabilities:
Current portion of advances on contracts	39,559	39,451	117,958
Other current liabilities	130,577	147,363	133,368
Total current liabilities	381,306	409,616	474,128
Advances on contracts	13,493	24,564	0
Other liabilities	48,821	42,426	40,846
Liabilities	1,345,259	1,325,152	1,363,520
HARSCO CORPORATION STOCKHOLDERS' EQUITY
Accumulated other comprehensive loss	(557,889)	(548,102)	(546,582)
Retained earnings	1,219,992	1,161,758	1,157,801
Stockholders' Equity Attributable to Parent	223,732	172,888	170,451
Stockholders' Equity Attributable to Noncontrolling Interest	42,421		44,714
Total equity	266,153	217,602	215,165	$ 186,896	$ 137,563
Total liabilities and equity	1,611,412	1,542,754	1,578,685
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Current assets:
Trade accounts receivable, net	295,661		288,034
Inventories	209,404		178,293
Current portion of contract assets	0		0
Other current assets	44,388		39,332
Total current assets	643,889		592,092
Contract assets	0		0
Deferred income tax assets	43,346
Other assets	18,163		15,263
Total assets	1,667,406		1,578,685
Current liabilities:
Current portion of advances on contracts	119,550		117,958
Other current liabilities	121,850		133,368
Total current liabilities	452,570		474,128
Advances on contracts	0		0
Other liabilities	48,520		40,846
Liabilities	1,402,729		1,363,520
HARSCO CORPORATION STOCKHOLDERS' EQUITY
Accumulated other comprehensive loss	(556,266)		(546,582)
Retained earnings	1,216,913		1,157,801
Stockholders' Equity Attributable to Parent	222,276		170,451
Stockholders' Equity Attributable to Noncontrolling Interest	42,401
Total equity	264,677		215,165
Total liabilities and equity	1,667,406		$ 1,578,685
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Current assets:
Trade accounts receivable, net	271	532
Inventories	78,533	(59,793)
Current portion of contract assets	(18,798)	18,248
Other current assets	(174)	179
Total current assets	59,832	(40,834)
Contract assets	(3,566)	3,566
Deferred income tax assets	959
Other assets	(1,231)	1,337
Total assets	55,994	(35,931)
Current liabilities:
Current portion of advances on contracts	79,991	(78,507)
Other current liabilities	(8,727)	13,995
Total current liabilities	71,264	(64,512)
Advances on contracts	(13,493)	24,564
Other liabilities	(301)	1,580
Liabilities	57,470	(38,368)
HARSCO CORPORATION STOCKHOLDERS' EQUITY
Accumulated other comprehensive loss	1,623	(1,520)
Retained earnings	(3,079)	3,957
Stockholders' Equity Attributable to Parent	(1,456)	2,437
Stockholders' Equity Attributable to Noncontrolling Interest	(20)
Total equity	(1,476)	2,437
Total liabilities and equity	$ 55,994	$ (35,931)

Recently Adopted and Recently40

Recently Adopted and Recently Issued Accounting Standards (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Revenues from continuing operations:
Total revenues	$ 431,972	$ 394,898		$ 840,010	$ 767,439
Costs and expenses from continuing operations:
Selling, general and administrative costs	58,927	54,385		116,010	108,322
Total costs and expenses	378,347	351,749		749,844	695,683
Operating income from continuing operations	53,625	43,149		90,166	71,756
Interest expense	(9,993)	(12,405)		(19,576)	(24,058)
Income from continuing operations before income taxes	44,079	30,562		72,374	47,329
Income tax expense	(1,944)	(11,234)		(10,210)	(17,487)
Income from continuing operations	42,135	19,328		62,164	29,842
Net income	42,711	19,731		62,288	29,868
Net Income (Loss) Attributable to Noncontrolling Interest	(2,222)	(693)		(3,991)	(1,940)
Amounts attributable to Harsco Corporation common stockholders:
Income from continuing operations, net of tax	39,913	18,635		58,173	27,902
Net income attributable to Harsco Corporation common stockholders	$ 40,489	$ 19,038		$ 58,297	$ 27,928
Basic earnings per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ 0.49	$ 0.23		$ 0.72	$ 0.35
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	0.50	0.24		0.72	0.35
Diluted earnings per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	0.48	0.22		0.70	0.34
Diluted earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ 0.48	$ 0.23	[1]	$ 0.70	$ 0.34
Service Revenues [Member]
Revenues from continuing operations:
Total revenues	$ 257,963	$ 251,306		$ 512,925	$ 491,915
Costs and expenses from continuing operations:
Cost of services and products sold	195,906	193,235		395,279	382,717
Product Revenues [Member]
Revenues from continuing operations:
Total revenues	174,009	143,592		327,085	275,524
Costs and expenses from continuing operations:
Cost of services and products sold	122,976	$ 100,728		234,956	$ 199,518
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenues from continuing operations:
Total revenues	(6,085)			(15,187)
Costs and expenses from continuing operations:
Selling, general and administrative costs	21			37
Total costs and expenses	(6,812)			(15,368)
Operating income from continuing operations	727			181
Interest expense	451			903
Income from continuing operations before income taxes	1,178			1,084
Income tax expense	12			4
Income from continuing operations	1,190			1,088
Net income	1,190			1,088
Net Income (Loss) Attributable to Noncontrolling Interest	2			2
Amounts attributable to Harsco Corporation common stockholders:
Income from continuing operations, net of tax	1,192			1,090
Net income attributable to Harsco Corporation common stockholders	$ 1,192			$ 1,090
Basic earnings per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ 0.01			$ 0.01
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	0.01			0.01
Diluted earnings per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	0.01			0.01
Diluted earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ 0.01			$ 0.01
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Service Revenues [Member]
Revenues from continuing operations:
Total revenues	$ 2,321			$ 3,671
Costs and expenses from continuing operations:
Cost of services and products sold	1,349			2,707
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Product Revenues [Member]
Revenues from continuing operations:
Total revenues	(8,406)			(18,858)
Costs and expenses from continuing operations:
Cost of services and products sold	(8,182)			(18,112)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenues from continuing operations:
Total revenues	425,887			824,823
Costs and expenses from continuing operations:
Selling, general and administrative costs	58,948			116,047
Total costs and expenses	371,535			734,476
Operating income from continuing operations	54,352			90,347
Interest expense	(9,542)			(18,673)
Income from continuing operations before income taxes	45,257			73,458
Income tax expense	(1,932)			(10,206)
Income from continuing operations	43,325			63,252
Net income	43,901			63,376
Net Income (Loss) Attributable to Noncontrolling Interest	(2,220)			(3,989)
Amounts attributable to Harsco Corporation common stockholders:
Income from continuing operations, net of tax	41,105			59,263
Net income attributable to Harsco Corporation common stockholders	$ 41,681			$ 59,387
Basic earnings per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ 0.50			$ 0.73
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	0.51			0.73
Diluted earnings per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	0.49			0.71
Diluted earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ 0.49			$ 0.71
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Service Revenues [Member]
Revenues from continuing operations:
Total revenues	$ 260,284			$ 516,596
Costs and expenses from continuing operations:
Cost of services and products sold	197,255			397,986
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Product Revenues [Member]
Revenues from continuing operations:
Total revenues	165,603			308,227
Costs and expenses from continuing operations:
Cost of services and products sold	$ 114,794			$ 216,844
[1]	Does not total due to rounding

Recently Adopted and Recently41

Recently Adopted and Recently Issued Accounting Standards (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income	$ 42,711	$ 19,731	$ 62,288	$ 29,868
Adjustments to reconcile net income to net cash used by operating activities:
Deferred income tax expense			340	3,433
Changes in assets and liabilities:
Accounts receivable			(21,445)	(42,806)
Inventories			(11,175)	(6,296)
Contract assets			(1,393)	0
Advances on contracts			(13,116)	(1,479)
Other assets and liabilities			(11,334)	4,990
Net Cash Provided by (Used in) Operating Activities			46,699	$ 46,779
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income	1,190		1,088
Adjustments to reconcile net income to net cash used by operating activities:
Deferred income tax expense			(4)
Changes in assets and liabilities:
Accounts receivable			(797)
Inventories			(22,661)
Contract assets			1,393
Advances on contracts			15,966
Other assets and liabilities			5,015
Net Cash Provided by (Used in) Operating Activities			0
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income	$ 43,901		63,376
Adjustments to reconcile net income to net cash used by operating activities:
Deferred income tax expense			336
Changes in assets and liabilities:
Accounts receivable			(22,242)
Inventories			(33,836)
Contract assets			0
Advances on contracts			2,850
Other assets and liabilities			(6,319)
Net Cash Provided by (Used in) Operating Activities			$ 46,699

Recently Adopted and Recently42

Recently Adopted and Recently Issued Accounting Standards (Details 4) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined benefit pension income (expense)	$ (904)	$ 675	$ (1,743)	$ 1,374
Cumulative Effect of New Accounting Principle in Period of Adoption					$ (2,374)		$ (397)
Stranded Income Tax Effects in Accumulated Other Comprehensive Income						$ 21,000
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (100)		$ (100)		$ (3,894)		$ 709

Acquisitions (Details)

Acquisitions (Details) - Altek £ in Millions, $ in Millions	1 Months Ended		3 Months Ended
	May 31, 2018GBP (£)	May 31, 2018USD ($)	Jun. 30, 2018USD ($)	May 29, 2018GBP (£)	May 29, 2018USD ($)
Business Acquisition [Line Items]
Cash transferred	£ 45	$ 60.1
Potential contingent consideration				£ 25	$ 33
Preliminary fair value of contingent consideration					$ 10.1
Selling, general, and administrative expenses
Business Acquisition [Line Items]
Acquisition costs			$ 1

Acquisitions (Details 1)

Acquisitions (Details 1) - USD ($) $ in Thousands	Jun. 30, 2018	May 31, 2018	May 29, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 413,837			$ 401,758
Altek
Business Acquisition [Line Items]
Cash and cash equivalents			$ 1,700
Net working capital			(1,500)
Property, plant and equipment, net			3,300
Intangible assets			52,500
Goodwill			20,900
Net deferred tax liabilities			(8,500)
Other liabilities			(300)
Total identifiable net assets of Altek			$ 68,200
Goodwill to be deductible for tax purposes (less than $1.0 million)		$ 1,000

Acquisitions (Details 2)

Acquisitions (Details 2) - Altek - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	May 29, 2018
Business Acquisition [Line Items]
Total identifiable intangible assets		$ 52.5
Customer related
Business Acquisition [Line Items]
Amortization Period	14 years 73 days
Total identifiable intangible assets		11.5
Technology related
Business Acquisition [Line Items]
Amortization Period	10 years 109 days
Total identifiable intangible assets		36.5
Trade names
Business Acquisition [Line Items]
Amortization Period	15 years
Total identifiable intangible assets		$ 4.5

Accounts Receivable and Inven46

Accounts Receivable and Inventories (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016	Jan. 01, 2018	Dec. 31, 2017
Accounts receivable
Trade accounts receivable	$ 299,723		$ 299,723				$ 292,765
Less: Allowance for doubtful accounts	(4,333)		(4,333)				(4,731)
Trade accounts receivable, net	295,390		295,390			$ 288,566	288,034
Other receivables	27,349		27,349				20,224
Provision for doubtful accounts related to trade accounts receivable	(110)	$ 1,197	(156)	$ 1,175
Inventories
Finished goods	21,463		21,463				26,415
Work-in-process	18,777		18,777				24,367
Contracts-in-process	0		0				45,599
Raw materials and purchased parts	67,389		67,389				58,943
Stores and supplies	23,242		23,242				22,969
Inventories	130,871		130,871			$ 118,500	178,293
Inventory for Contracts
Contract costs accumulated to date							73,740
Estimated loss provisions for contracts-in-process							(28,141)
Contracts-in-process	0		0				45,599
Loss provision that exceeds accumulated contract costs	10,200		10,200				3,000
Customer Advances and Deposits	39,900		39,900				$ 97,900
Contract estimated forward loss provision for Harsco Rail Segment			1,800		$ 45,100
SBB [Member]
Revenue from External Customer [Line Items]
Revenues	$ 7,500	$ 0	$ 15,500
Contract 1 [Member] | SBB [Member]
Revenue from External Customer [Line Items]
Percentage Complete	98.00%		98.00%
Contract 2 [Member] | SBB [Member]
Revenue from External Customer [Line Items]
Percentage Complete	21.00%		21.00%

Property, Plant and Equipment47

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment
Gross property, plant and equipment	$ 1,820,061	$ 1,848,518
Less: Accumulated depreciation	(1,358,155)	(1,368,771)
Property, plant and equipment, net	461,906	479,747
Land
Property, Plant and Equipment
Gross property, plant and equipment	10,532	10,840
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	16,117	14,996
Buildings and improvements
Property, Plant and Equipment
Gross property, plant and equipment	194,193	198,582
Machinery and equipment
Property, Plant and Equipment
Gross property, plant and equipment	1,571,753	1,599,713
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 27,466	$ 24,387

Goodwill and Other Intangible48

Goodwill and Other Intangible Assets (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Changes in carrying amounts of goodwill
Balance at December 31, 2017	$ 401,758
Goodwill, Other Increase (Decrease)	(20,942)
Foreign currency translation	(8,863)
Balance at June 30, 2018	413,837
Harsco Metals & Minerals Segment
Changes in carrying amounts of goodwill
Balance at December 31, 2017	381,893
Goodwill, Other Increase (Decrease)	(20,942)
Foreign currency translation	(8,863)
Balance at June 30, 2018	393,972
Harsco Industrial Segment
Changes in carrying amounts of goodwill
Balance at December 31, 2017	6,839
Goodwill, Other Increase (Decrease)	0
Foreign currency translation	0
Balance at June 30, 2018	6,839
Harsco Rail Segment
Changes in carrying amounts of goodwill
Balance at December 31, 2017	13,026
Goodwill, Other Increase (Decrease)	0
Foreign currency translation	0
Balance at June 30, 2018	$ 13,026

Goodwill and Other Intangible49

Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Intangible Assets, by category
Gross Carrying Amount	$ 250,004		$ 250,004		$ 202,162
Accumulated Amortization	163,739		163,739		163,911
Amortization expense for intangible assets	1,649	$ 1,280	2,931	$ 2,598
Estimated amortization expense for next 5 years
2,018	7,900		7,900
2,019	9,750		9,750
2,020	9,250		9,250
2,021	8,800		8,800
2,022	8,500		8,500
Customer related
Intangible Assets, by category
Gross Carrying Amount	161,149		161,149		153,014
Accumulated Amortization	120,898		120,898		121,385
Patents
Intangible Assets, by category
Gross Carrying Amount	5,748		5,748		5,825
Accumulated Amortization	5,645		5,645		5,700
Technology related
Intangible Assets, by category
Gross Carrying Amount	61,646		61,646		26,131
Accumulated Amortization	26,126		26,126		26,131
Trade names
Intangible Assets, by category
Gross Carrying Amount	12,713		12,713		8,317
Accumulated Amortization	5,016		5,016		4,845
Other
Intangible Assets, by category
Gross Carrying Amount	8,748		8,748		8,875
Accumulated Amortization	$ 6,054		$ 6,054		$ 5,850

Debt and Credit Agreements (Det

Debt and Credit Agreements (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	$ (1,034,000)	$ 0	$ (1,034,000)	$ 0
Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500,000,000		$ 500,000,000
Line of Credit [Member] | LIBOR
Debt Instrument [Line Items]
Variable rate basis spread			2.25%

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined benefit plans:
Multiemployer pension plans	$ 519	$ 498	$ 1,020	$ 983
Defined contribution pension plans	2,747	2,468	5,582	5,028
Pension Plan | U.S. Plans
Defined benefit plans:
Service cost	11	11	21	22
Interest cost	2,390	2,470	4,781	4,939
Expected return on plan assets	(3,017)	(2,621)	(6,034)	(5,242)
Recognized prior service costs	0	8	0	16
Recognized loss	1,302	1,425	2,604	2,850
Settlement/curtailment losses			166	0
Defined benefit pension plans net periodic pension cost (income)	686	1,293	1,538	2,585
Defined benefit pension plan	2,067	471	3,351	942
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	6,600		6,600
Pension Plan | International Plans
Defined benefit plans:
Service cost	408	406	794	817
Interest cost	5,442	5,773	11,114	11,507
Expected return on plan assets	(10,696)	(10,515)	(21,841)	(20,939)
Recognized prior service costs	(37)	46	(76)	91
Recognized loss	3,690	4,087	7,530	8,129
Settlement/curtailment losses			0	0
Defined benefit pension plans net periodic pension cost (income)	(1,193)	(203)	(2,479)	(395)
Defined benefit pension plan	3,239	$ 2,963	12,973	$ 11,300
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 5,600		$ 5,600

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense	$ 1,944	$ 11,234	$ 10,210	$ 17,487
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	8,300
Unrecognized income tax benefits including interest and penalties	4,900		4,900
Portion of unrecognized income tax benefits, expected to be recognized upon settlement of tax examinations and the expiration of various statutes of limitations within next twelve months	$ 1,100		$ 1,100
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense					$ 48,700

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Aug. 31, 2005USD ($)	Jun. 30, 2018USD ($)claimcase	Jun. 30, 2018USD ($)claimdefendantcase	Dec. 31, 2017USD ($)	Apr. 08, 2016USD ($)
Commitments and Contingencies
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		35.00%	35.00%
Accrual for Environmental Loss Contingencies		$ 7	$ 7
Lima Refinery Litigation
Commitments and Contingencies
Loss contingency damages sought					$ 106
Lima Refinery property damages					$ 289
Brazilian Tax Disputes - Jan 2004 through May 2005 | Sao Paulo State Revenue Authority
Commitments and Contingencies
Damages sought - principal			2
Damages sought - interest, penalties and fees		2	21
Amount of damages sought		9
Brazilian Tax Disputes - Jan 2002 through Dec 2003 | Sao Paulo State Revenue Authority
Commitments and Contingencies
Damages sought - principal	$ 1.5
Damages sought - interest, penalties and fees	5
Amount of damages sought	$ 6.5
Brazilian Labor Claims
Commitments and Contingencies
Loss contingency reserves		$ 8.7	$ 8.7	$ 9.6
Other
Commitments and Contingencies
Approximate number of defendants that includes the company named in legal actions | defendant			90
Number of pending claims | claim		17,286	17,286
Number of claims dismissed to date by stipulation or summary judgment prior to trial | case			27,999
Other | Active or In Extremis docket
Commitments and Contingencies
Number of pending claims | claim		33	33
Other | Minimum
Commitments and Contingencies
Amount of damages sought			$ 20
Other | Maximum
Commitments and Contingencies
Amount of damages sought			$ 25
Other | New York County as managed by the New York Supreme Court
Commitments and Contingencies
Number of pending claims | case		16,737	16,737
Other | New York County as managed by the New York Supreme Court | Pending And Future Litigation, Deferred Or Inactive Docket
Commitments and Contingencies
Number of pending claims | claim		16,704	16,704
Other | New York State Supreme Court, Counties Excluding New York County
Commitments and Contingencies
Number of pending claims | case		111	111
Other | Courts Located In States Other Than New York
Commitments and Contingencies
Number of pending claims | case		438	438
Consolidated Revenues | Subsidiary Concentration Risk
Commitments and Contingencies
Concentration risk, percentage			2.00%

Reconciliation of Basic and D54

Reconciliation of Basic and Diluted Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Income from continuing operations, net of tax	$ 39,913	$ 18,635	$ 58,173	$ 27,902
Weighted-average shares outstanding - basic (in shares)	80,861	80,535	80,756	80,460
Dilutive effect of stock-based compensation (in shares)	2,782	2,315	2,838	2,098
Weighted-average shares outstanding - diluted (in shares)	83,643	82,850	83,594	82,558
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic (in dollars per share)	$ 0.49	$ 0.23	$ 0.72	$ 0.35
Diluted (in dollars per share)	$ 0.48	$ 0.22	$ 0.70	$ 0.34

Reconciliation of Basic and D55

Reconciliation of Basic and Diluted Shares (Details 2) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restricted stock units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	0	0	0	0
Stock options
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	0	55	0	55
Stock appreciation rights
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	283	972	489	1,117
Performance share units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	0	176	0	320

Derivative Instruments, Hedgi56

Derivative Instruments, Hedging Activities and Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Derivative contracts
Liabilities	$ 1,345,259	$ 1,325,152	$ 1,363,520
Subject to Master Netting Agreements [Member]
Derivative contracts
Net Assets	1,100
Liabilities			200
Designated as hedging instrument
Derivative contracts
Asset Derivatives	6,948		2,963
Liability Derivatives	742		1,521
Designated as hedging instrument | Foreign currency forward exchange contracts | Other current assets
Derivative contracts
Asset Derivatives	2,183		2,329
Designated as hedging instrument | Foreign currency forward exchange contracts | Other current liabilities
Derivative contracts
Liability Derivatives	389		153
Designated as hedging instrument | Interest rate swaps | Other current assets
Derivative contracts
Asset Derivatives	1,623		464
Designated as hedging instrument | Interest rate swaps | Other Noncurrent Assets [Member]
Derivative contracts
Asset Derivatives	3,142		170
Designated as hedging instrument | Interest rate swaps | Other current liabilities
Derivative contracts
Liability Derivatives
Designated as hedging instrument | Interest rate swaps | Other liabilities
Derivative contracts
Liability Derivatives	353		1,368
Derivatives Not Designated as Hedging Instruments | Foreign currency forward exchange contracts | Other current assets
Derivative contracts
Asset Derivatives	11,567		2,915
Derivatives Not Designated as Hedging Instruments | Foreign currency forward exchange contracts | Other current liabilities
Derivative contracts
Liability Derivatives	$ 2,415		$ 6,970

Derivative Instruments, Hedgi57

Derivative Instruments, Hedging Activities and Fair Value (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	$ 3,703	$ (1,017)	$ 7,160	$ (1,903)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	245	65	(1,216)	308
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	(107)	0	(317)
Accumulated other comprehensive loss	(557,889)		(557,889)		$ (548,102)	$ (546,582)
Foreign currency forward exchange contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	1,539	1,001	1,779	763
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	0	0	0
Foreign currency forward exchange contracts | Cost of services and products sold
Effect of derivative instruments
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	103	(186)	(109)	(185)
Derivatives Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative	15,731	(13,289)	10,265	(11,739)
Interest rate swaps
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	2,071	(2,021)	5,381	(2,543)
Interest rate swaps | Interest Expense [Member]
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	(235)		(235)
Cross currency interest rate swaps
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	93	3	0	(123)
Cross currency interest rate swaps | Cost of services and products sold
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	(107)	0	(317)
Cross currency interest rate swaps | Interest Expense [Member]
Effect of derivative instruments
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	377	$ 251	648	$ 493
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Effect of derivative instruments
Accumulated other comprehensive loss	$ 1,623		$ 1,623		$ (1,520)

Derivative Instruments, Hedgi58

Derivative Instruments, Hedging Activities and Fair Value (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2022	Dec. 31, 2018	Dec. 31, 2017
Foreign Currency Derivatives
Pre-tax net gains (losses) on certain loans designated as hedges of net investments in foreign subsidiaries	$ (16,100)	$ 7,700	$ (6,600)	$ 9,500
Foreign currency forward exchange contracts
Foreign Currency Derivatives
U.S. Dollar Equivalent	649,565		649,565				$ 671,857
Recognized Gain (Loss)			10,946	(1,879)
Foreign currency forward exchange contracts | British pounds sterling | Sell
Foreign Currency Derivatives
U.S. Dollar Equivalent	96,546		96,546				76,761
Recognized Gain (Loss)			3,024	(769)
Foreign currency forward exchange contracts | British pounds sterling | Buy
Foreign Currency Derivatives
U.S. Dollar Equivalent	9,590		9,590				5,960
Recognized Gain (Loss)			(157)	72
Foreign currency forward exchange contracts | Euros | Sell
Foreign Currency Derivatives
U.S. Dollar Equivalent	306,503		306,503				314,649
Recognized Gain (Loss)			8,258	(4,916)
Foreign currency forward exchange contracts | Euros | Buy
Foreign Currency Derivatives
U.S. Dollar Equivalent	192,929		192,929				223,111
Recognized Gain (Loss)			(1,435)	4,564
Foreign currency forward exchange contracts | Other currencies | Sell
Foreign Currency Derivatives
U.S. Dollar Equivalent	41,096		41,096				39,889
Recognized Gain (Loss)			1,296	(1,049)
Foreign currency forward exchange contracts | Other currencies | Buy
Foreign Currency Derivatives
U.S. Dollar Equivalent	2,901		2,901				$ 11,487
Recognized Gain (Loss)			(40)	$ 219
Term Loan Facility, Fixed-Rate | Term Loan
Foreign Currency Derivatives
Principal amount	$ 300,000		$ 300,000
LIBOR | Scenario, Forecast | Term Loan Facility, Fixed-Rate | Term Loan
Foreign Currency Derivatives
Variable rate basis spread					3.12%	1.65%

Derivative Instruments, Hedgi59

Derivative Instruments, Hedging Activities and Fair Value (Details 5) - Fair value measurements recurring - Level 2 - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Foreign currency forward exchange contracts	$ 13,750	$ 5,244
Liabilities
Foreign currency forward exchange contracts	2,804	7,123
Interest rate swaps
Assets
Interest rate swaps	4,765	634
Liabilities
Interest rate swaps	$ 353	$ 1,368

Derivative Instruments, Hedgi60

Derivative Instruments, Hedging Activities and Fair Value (Details 6) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Long-term debt, including current maturities
Fair value of long-term debt	$ 674.2	$ 599.1
Carrying value of long-term debt	$ 675.1	$ 593.7

Review of Operations by Segme61

Review of Operations by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operations by segment
Total revenues	$ 431,972	$ 394,898	$ 840,010	$ 767,439
Operating income from continuing operations	53,625	43,149	90,166	71,756
Interest income	577	493	1,075	1,005
Interest expense	(9,993)	(12,405)	(19,576)	(24,058)
Defined benefit pension income (expense)	(904)	675	(1,743)	1,374
Gain (Loss) on Extinguishment of Debt	(1,034)	0	(1,034)	0
Income from continuing operations before income taxes	44,079	30,562	72,374	47,329
Depreciation and Amortization	33,219	32,275	66,571	64,503
Capital Expenditures	29,599	23,711	56,496	40,700
Operating Segments
Operations by segment
Operating income from continuing operations	58,449	48,896	100,557	83,764
Corporate
Operations by segment
Total revenues	35	35	74	69
Operating income from continuing operations	(4,824)	(5,747)	(10,391)	(12,008)
Depreciation and Amortization	1,666	1,479	3,014	2,950
Capital Expenditures	172	233	376	778
Harsco Metals & Minerals Segment | Operating Segments
Operations by segment
Total revenues	272,320	259,306	537,043	506,340
Operating income from continuing operations	35,661	31,464	63,396	57,221
Depreciation and Amortization	28,632	27,928	57,717	55,808
Capital Expenditures	24,423	21,599	49,599	37,071
Harsco Industrial Segment | Operating Segments
Operations by segment
Total revenues	92,065	73,563	175,663	139,448
Operating income from continuing operations	14,170	9,240	26,591	12,134
Depreciation and Amortization	1,882	1,843	3,737	3,683
Capital Expenditures	2,916	796	4,003	1,548
Harsco Rail Segment | Operating Segments
Operations by segment
Total revenues	67,552	61,994	127,230	121,582
Operating income from continuing operations	8,618	8,192	10,570	14,409
Depreciation and Amortization	1,039	1,025	2,103	2,062
Capital Expenditures	$ 2,088	$ 1,083	$ 2,518	$ 1,303

Revenue Recognition (Details)

Revenue Recognition (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018USD ($)
Harsco Metals & Minerals Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 39.8
Period of expected timing of satisfaction	1 year
Harsco Metals & Minerals Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 33.1
Period of expected timing of satisfaction	1 year
Harsco Metals & Minerals Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 23.2
Period of expected timing of satisfaction	1 year
Harsco Metals & Minerals Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 17.5
Period of expected timing of satisfaction	1 year
Harsco Metals & Minerals Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Period of expected timing of satisfaction	1 year
Harsco Metals & Minerals Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 139.5
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 38.1
Period of expected timing of satisfaction	1 year
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 70
Period of expected timing of satisfaction	1 year
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 57
Period of expected timing of satisfaction	1 year
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 30.1
Period of expected timing of satisfaction	1 year
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Period of expected timing of satisfaction	1 year
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 204.5

Revenue Recognition (Details 1)

Revenue Recognition (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 431,972	$ 394,898	$ 840,010	$ 767,439
On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products
Disaggregation of Revenue [Line Items]
Total revenues	272,320	259,306	537,043	506,340
Railway track maintenance services and equipment
Disaggregation of Revenue [Line Items]
Total revenues	67,552	61,994	127,230	121,582
Industrial grating and fencing products
Disaggregation of Revenue [Line Items]
Total revenues	32,446	29,134	62,543	57,293
Air-cooled heat exchangers
Disaggregation of Revenue [Line Items]
Total revenues	48,576	33,774	92,843	64,235
Heat transfer products
Disaggregation of Revenue [Line Items]
Total revenues	11,043	10,655	20,277	17,920
General Corporate
Disaggregation of Revenue [Line Items]
Total revenues	35	35	74	69
Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	110,451	104,348	222,092	205,607
North America
Disaggregation of Revenue [Line Items]
Total revenues	214,618	186,707	404,985	357,475
Latin America
Disaggregation of Revenue [Line Items]
Total revenues	43,610	45,844	90,641	90,922
Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	43,421	41,485	83,362	79,417
Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	12,150	9,953	23,703	20,509
Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	7,722	6,561	15,227	13,509
Harsco Metals & Minerals Segment
Disaggregation of Revenue [Line Items]
Total revenues	272,320	259,306	537,043	506,340
Harsco Metals & Minerals Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products
Disaggregation of Revenue [Line Items]
Total revenues	272,320	259,306	537,043	506,340
Harsco Metals & Minerals Segment | Railway track maintenance services and equipment
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Metals & Minerals Segment | Industrial grating and fencing products
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Metals & Minerals Segment | Air-cooled heat exchangers
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Metals & Minerals Segment | Heat transfer products
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Metals & Minerals Segment | General Corporate
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Metals & Minerals Segment | Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	97,410	97,516	194,331	189,236
Harsco Metals & Minerals Segment | North America
Disaggregation of Revenue [Line Items]
Total revenues	79,862	70,759	150,927	137,992
Harsco Metals & Minerals Segment | Latin America
Disaggregation of Revenue [Line Items]
Total revenues	37,388	39,758	78,846	77,778
Harsco Metals & Minerals Segment | Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	37,788	34,759	74,009	67,316
Harsco Metals & Minerals Segment | Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	12,150	9,953	23,703	20,509
Harsco Metals & Minerals Segment | Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	7,722	6,561	15,227	13,509
Harsco Industrial Segment
Disaggregation of Revenue [Line Items]
Total revenues	92,065	73,563	175,663	139,448
Harsco Industrial Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Industrial Segment | Railway track maintenance services and equipment
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Industrial Segment | Industrial grating and fencing products
Disaggregation of Revenue [Line Items]
Total revenues	32,446	29,134	62,543	57,293
Harsco Industrial Segment | Air-cooled heat exchangers
Disaggregation of Revenue [Line Items]
Total revenues	48,576	33,774	92,843	64,235
Harsco Industrial Segment | Heat transfer products
Disaggregation of Revenue [Line Items]
Total revenues	11,043	10,655	20,277	17,920
Harsco Industrial Segment | General Corporate
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Industrial Segment | Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Industrial Segment | North America
Disaggregation of Revenue [Line Items]
Total revenues	87,174	67,165	166,032	125,516
Harsco Industrial Segment | Latin America
Disaggregation of Revenue [Line Items]
Total revenues	4,891	5,308	9,631	11,890
Harsco Industrial Segment | Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	0	1,090	0	2,042
Harsco Industrial Segment | Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Industrial Segment | Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Rail Segment
Disaggregation of Revenue [Line Items]
Total revenues	67,552	61,994	127,230	121,582
Harsco Rail Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Rail Segment | Railway track maintenance services and equipment
Disaggregation of Revenue [Line Items]
Total revenues	67,552	61,994	127,230	121,582
Harsco Rail Segment | Industrial grating and fencing products
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Rail Segment | Air-cooled heat exchangers
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Rail Segment | Heat transfer products
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Rail Segment | General Corporate
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Rail Segment | Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	13,041	6,832	27,761	16,371
Harsco Rail Segment | North America
Disaggregation of Revenue [Line Items]
Total revenues	47,547	48,748	87,952	93,898
Harsco Rail Segment | Latin America
Disaggregation of Revenue [Line Items]
Total revenues	1,331	778	2,164	1,254
Harsco Rail Segment | Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	5,633	5,636	9,353	10,059
Harsco Rail Segment | Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Harsco Rail Segment | Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate
Disaggregation of Revenue [Line Items]
Total revenues	35	35	74	69
Corporate | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; as well as value- added environmental solutions for industrial co-products
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate | Railway track maintenance services and equipment
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate | Industrial grating and fencing products
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate | Air-cooled heat exchangers
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate | Heat transfer products
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate | General Corporate
Disaggregation of Revenue [Line Items]
Total revenues	35	35	74	69
Corporate | Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate | North America
Disaggregation of Revenue [Line Items]
Total revenues	35	35	74	69
Corporate | Latin America
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate | Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate | Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate | Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0	$ 0	$ 0

Revenue Recognition (Details 2)

Revenue Recognition (Details 2) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract assets:
Current portion of contract assets	$ 18,798	$ 18,248	$ 0
Contract assets	3,566	3,566	0
Total contract assets	22,364		0
Advances on contracts:
Current portion of advances on contracts	39,559	39,451	117,958
Advances on contracts	13,493	$ 24,564	0
Total advances on contracts	$ 53,052		$ 117,958

Other (Income) Expenses (Detail

Other (Income) Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Employee termination benefit costs	$ 769	$ 1,695	$ 2,212	$ 2,448
Net gains	(1,097)	(88)	(1,097)	(210)
Other costs to exit activities	100	247	464	347
Impaired asset write-downs	104	281	113	281
Other	(756)	(63)	(750)	100
Other (income) expenses, net	$ (880)	$ 2,072	$ 942	$ 2,966

Components of Accumulated Oth66

Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			$ 215,165	$ 137,563
Accumulated other comprehensive loss					$ (2,374)		$ (397)
Other comprehensive income (loss) before reclassifications			(20,735)	6,294
Amounts reclassified from accumulated other comprehensive loss			9,708	10,227
Total other comprehensive loss	$ (17,190)	$ (864)	(11,027)	16,521
Other comprehensive loss attributable to noncontrolling interests			1,240	(1,534)
Other comprehensive income (loss) attributable to Harsco Corporation			(9,787)	14,987
Balances	266,153	186,896	266,153	186,896
Cumulative Foreign Exchange Translation Adjustments
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			(111,567)	(144,534)
Other comprehensive income (loss) before reclassifications			(36,205)	26,386
Amounts reclassified from accumulated other comprehensive loss			0	0
Total other comprehensive loss			(36,205)	26,386
Other comprehensive loss attributable to noncontrolling interests			1,240	(1,534)
Other comprehensive income (loss) attributable to Harsco Corporation			(34,965)	24,852
Balances	(146,532)	(119,682)	(146,532)	(119,682)
Effective Portion of Deriviatives Designated as Hedging Instruments
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			808	(1,089)
Other comprehensive income (loss) before reclassifications			5,482	(913)
Amounts reclassified from accumulated other comprehensive loss			97	185
Total other comprehensive loss			5,579	(728)
Other comprehensive loss attributable to noncontrolling interests			0	0
Other comprehensive income (loss) attributable to Harsco Corporation			5,579	(728)
Balances	4,867	(1,817)	4,867	(1,817)
Cumulative Unrecognized Actuarial Losses on Pension Obligations
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			(435,840)	(461,094)
Other comprehensive income (loss) before reclassifications			10,015	(19,185)
Amounts reclassified from accumulated other comprehensive loss			9,611	10,042
Total other comprehensive loss			19,626	(9,143)
Other comprehensive loss attributable to noncontrolling interests			0	0
Other comprehensive income (loss) attributable to Harsco Corporation			19,626	(9,143)
Balances	(416,214)	(470,237)	(416,214)	(470,237)
Unrealized Loss on Marketable Securities
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			17	(5)
Other comprehensive income (loss) before reclassifications			(27)	6
Amounts reclassified from accumulated other comprehensive loss			0	0
Total other comprehensive loss			(27)	6
Other comprehensive loss attributable to noncontrolling interests			0	0
Other comprehensive income (loss) attributable to Harsco Corporation			(27)	6
Balances	(10)	1	(10)	1
Accumulated Other Comprehensive Loss
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			(546,582)	(606,722)
Accumulated other comprehensive loss					$ 1,520
Total other comprehensive loss			(9,787)	14,987
Balances	$ (557,889)	$ (591,735)	(557,889)	$ (591,735)
Accounting Standards Update 2014-09 | Cumulative Foreign Exchange Translation Adjustments
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			(111,567)
Accounting Standards Update 2014-09 | Effective Portion of Deriviatives Designated as Hedging Instruments
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			(712)
Accumulated other comprehensive loss						$ (1,520)
Accounting Standards Update 2014-09 | Cumulative Unrecognized Actuarial Losses on Pension Obligations
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			(435,840)
Accounting Standards Update 2014-09 | Unrealized Loss on Marketable Securities
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			17
Accounting Standards Update 2014-09 | Accumulated Other Comprehensive Loss
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances			$ (548,102)
Accumulated other comprehensive loss						$ (1,520)

Components of Accumulated Oth67

Components of Accumulated Other Comprehensive Loss Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	$ 9,993	$ 12,405	$ 19,576	$ 24,058
Income from continuing operations before income taxes	44,079	30,562	72,374	47,329
Income tax expense	1,944	11,234	10,210	17,487
Net income	42,711	19,731	62,288	29,868
Amount Reclassified from Accumulated Other Comprehensive Loss | Cumulative Unrecognized Actuarial Losses on Pension Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income taxes	4,955	5,566	10,224	11,086
Income tax expense	(288)	(522)	(613)	(1,044)
Net income	4,667	5,044	9,611	10,042
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income taxes	245	65	304	308
Income tax expense	(57)	(29)	(207)	(123)
Net income	188	36	97	185
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments | Foreign currency forward exchange contracts
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenues	103	(189)	(109)	(189)
Cost of services and products sold	0	3	0	4
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments | Cross currency interest rate swaps
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	377	251	648	493
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments | Interest rate swaps
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	(235)	0	(235)	0
Amount Reclassified from Accumulated Other Comprehensive Loss | Actuarial losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	4,992	5,512	10,134	10,979
Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs (benefits)
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	(37)	54	(76)	107
Amount Reclassified from Accumulated Other Comprehensive Loss | Settlement/curtailment losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	$ 0	$ 0	$ 166	$ 0