Enviri (NVRI) 10-Q 31 Jul 19 2019 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2019	Jul. 15, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-03970
Entity Registrant Name	HARSCO CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	23-1483991
Entity Address, Address Line One	350 Poplar Church Road,
Entity Address, City or Town	Camp Hill,
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	17011
City Area Code	717
Local Phone Number	763-7064
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common stock, par value $1.25 per share
Trading Symbol	HSC
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		80,278,742
Entity Central Index Key	0000045876
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 106,094	$ 64,260
Restricted cash	2,985	2,886
Trade accounts receivable, net	333,357	246,427
Other receivables	53,019	53,770
Inventories	133,890	116,185
Current portion of contract assets	8,215	12,130
Current portion of assets held-for-sale	91,979	75,232
Other current assets	52,418	34,144
Total current assets	781,957	605,034
Property, plant and equipment, net	550,671	432,793
Right-of-use assets, net	44,145	0
Goodwill	717,727	404,713
Intangible assets, net	326,688	69,207
Deferred income tax assets	16,764	48,551
Assets held-for-sale	74,743	55,331
Other assets	21,999	17,238
Total assets	2,534,694	1,632,867
Current liabilities:
Short-term borrowings	10,405	10,078
Current maturities of long-term debt	6,840	6,489
Accounts payable	176,308	124,984
Due to Other Related Parties, Current	39,182	0
Accrued compensation	41,442	50,201
Income taxes payable	890	2,634
Insurance liabilities	40,664	40,774
Current portion of advances on contracts	45,787	29,407
Current portion of operating lease liabilities	12,960	0
Current portion of liabilities of assets held-for-sale	38,077	39,410
Other current liabilities	120,051	113,019
Total current liabilities	532,606	416,996
Long-term debt	1,313,843	585,662
Insurance liabilities	19,721	19,575
Retirement plan liabilities	190,525	213,578
Advances on contracts	9,642	37,675
Operating lease liabilities	31,440	0
Liabilities of assets held-for-sale	15,549	555
Other liabilities	72,254	45,450
Total liabilities	2,185,580	1,319,491
COMMITMENTS AND CONTINGENCIES
HARSCO CORPORATION STOCKHOLDERS' EQUITY
Preferred stock	0	0
Common stock	143,394	141,842
Additional paid-in capital	195,034	190,597
Accumulated other comprehensive loss	(580,229)	(567,107)
Retained earnings	1,349,520	1,298,752
Treasury stock	(807,003)	(795,821)
Total Harsco Corporation stockholders' equity	300,716	268,263
Noncontrolling interests	48,398	45,113
Total equity	349,114	313,376
Total liabilities and equity	$ 2,534,694	$ 1,632,867

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019		Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues from continuing operations:
Total revenues	$ 350,898		$ 339,907	$ 680,800	$ 664,347
Costs and expenses from continuing operations:
Selling, general and administrative costs	67,501		49,609	123,907	98,208
Research and development expenses	1,120		1,006	1,869	1,827
Other (income) expenses, net	(1,717)		(1,014)	26	650
Total costs and expenses	333,099		301,843	643,177	603,555
Operating income from continuing operations	17,799		38,064	37,623	60,792
Interest income	591		577	1,124	1,070
Interest expense	(6,103)		(5,681)	(11,610)	(11,271)
Unused debt commitment and amendment fees	(7,435)		0	(7,435)	0
Gain (Loss) on Extinguishment of Debt	0		(1,034)	0	(1,034)
Defined benefit pension income (expense)	(1,472)		904	(2,810)	1,743
Income from continuing operations before income taxes and equity income	3,380		32,830	16,892	51,300
Income tax (expense) benefit	(3,994)		502	(5,213)	(5,696)
Equity income of unconsolidated entities, net	49		0	70	0
Income (loss) from continuing operations	(565)		33,332	11,749	45,604
Discontinued operations:
Income from discontinued businesses	9,936		11,988	23,686	21,233
Income tax (expense) benefit related to discontinued businesses	1,558		(2,609)	(1,969)	(4,549)
Income from discontinued operations	11,494		9,379	21,717	16,684
Net income	10,929		42,711	33,466	62,288
Less: Net income attributable to noncontrolling interests	(2,287)		(2,222)	(4,127)	(3,991)
Net income attributable to Harsco Corporation	8,642		40,489	29,339	58,297
Amounts attributable to Harsco Corporation common stockholders:
Income (loss) from continuing operations, net of tax	(2,852)		31,110	7,622	41,613
Income from discontinued operations	11,494		9,379	21,717	16,684
Net income attributable to Harsco Corporation	$ 8,642		$ 40,489	$ 29,339	$ 58,297
Weighted-average shares of common stock outstanding (in shares)	80,328		80,861	80,119	80,756
Basic earnings (loss) per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ (0.04)		$ 0.38	$ 0.10	$ 0.52
Discontinued operations (in dollars per share)	0.14		0.12	0.27	0.21
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ 0.11		$ 0.50	$ 0.37	$ 0.72
Diluted weighted-average shares of common stock outstanding (in shares)	80,328		83,643	82,074	83,594
Diluted earnings (loss) per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ (0.04)		$ 0.37	$ 0.09	$ 0.50
Discontinued operations (in dollars per share)	0.14		0.11	0.26	0.20
Diluted earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ 0.11	[1]	$ 0.48	$ 0.36	$ 0.70
Products And Services, Service Revenue [Member]
Revenues from continuing operations:
Total revenues	$ 238,003		$ 245,708	$ 467,523	$ 489,918
Costs and expenses from continuing operations:
Cost of services sold	186,840		187,393	368,711	379,068
Product Revenues
Revenues from continuing operations:
Total revenues	112,895		94,199	213,277	174,429
Costs and expenses from continuing operations:
Cost of services sold	$ 79,355		$ 64,849	$ 148,664	$ 123,802
[1]	Does not total due to rounding

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 10,929	$ 42,711	$ 33,466	$ 62,288
Other comprehensive income (loss):
Foreign currency translation adjustments, net of deferred income taxes of $(1,383) and $252; and $(2,579) and $(952) for the three and six months ended June 30, 2019 and 2018, respectively	(8,950)	(48,706)	504	(36,205)
Net gain (loss) on cash flow hedging instruments, net of deferred income taxes of $496 and $1,141; and $(1,046) and $(1,885) for the three and six months ended June 30, 2019 and 2018, respectively	(1,024)	2,902	(4,171)	5,579
Pension liability adjustments, net of deferred income taxes of $(379) and $(721); and $(288) and $(613) for the three and six months ended June 30, 2019 and 2018, respectively	13,562	28,627	11,771	19,626
Unrealized gain (loss) on marketable securities, net of deferred income taxes of $(3) and $(8); and $4 and $8 for the three and six months ended June 30, 2019 and 2018, respectively	10	(13)	25	(27)
Total other comprehensive income (loss)	3,598	(17,190)	8,129	(11,027)
Total comprehensive income	14,527	25,521	41,595	51,261
Less: Comprehensive (income) loss attributable to noncontrolling interests	(1,687)	296	(3,947)	(2,751)
Comprehensive income attributable to Harsco Corporation	$ 12,840	$ 25,817	$ 37,648	$ 48,510

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, deferred income taxes	$ (1,383)	$ (2,579)	$ (252)	$ (952)
Net gain (loss) on cash flow hedging instruments, deferred income taxes	196	(1,046)	1,141	(1,885)
Pension liability adjustments, deferred income taxes	(379)	(288)	(721)	(613)
Unrealized gain (loss) on marketable securities, deferred income taxes	$ (3)	$ 4	$ (8)	$ 8

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Change in accrual for purchases of property, plant and equipment included in accounts payable	$ 12,804	$ 4,965
Cash flows from operating activities:
Net income	33,466	62,288
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	59,857	62,005
Amortization	5,792	4,566
Deferred income tax expense (benefit)	(3,823)	340
Equity income of unconsolidated entities, net	(70)	0
Other, net	2,561	3,037
Changes in assets and liabilities:
Accounts receivable	(27,034)	(21,445)
Inventories	(20,497)	(11,175)
Contract assets	(69)	(1,393)
Right-of-use assets	7,228	0
Accounts payable	10,917	7,359
Accrued interest payable	285	(58)
Accrued compensation	(14,525)	(16,045)
Advances on contracts	(10,381)	(13,116)
Operating lease liabilities	(6,894)	0
Retirement plan liabilities, net	(13,146)	(18,330)
Other assets and liabilities	(18,295)	(11,334)
Net cash provided by operating activities	5,372	46,699
Cash flows from investing activities:
Purchases of property, plant and equipment	(91,201)	(56,496)
Purchases of businesses, net of cash acquired	(584,485)	(56,389)
Proceeds from sales of assets	2,205	3,153
Purchase of intangible assets	(525)	0
Net payments from settlement of foreign currency forward exchange contracts	(691)	(2,942)
Payments for interest rate swap terminations	(2,758)	0
Net cash used by investing activities	(677,455)	(112,674)
Cash flows from financing activities:
Short-term borrowings, net	84	(2,977)
Current maturities and long-term debt:
Additions	740,360	124,858
Reductions	(3,333)	(43,193)
Dividends paid to noncontrolling interest	3,098	4,609
Sale of noncontrolling interests	876	477
Stock-based compensation - Employee taxes paid	(11,167)	(3,614)
Deferred financing costs	9,464	354
Net cash provided by financing activities	714,258	70,588
Effect of exchange rate changes on cash and cash equivalents, including restricted cash	(242)	(3,735)
Net increase in cash and cash equivalents, including restricted cash	41,933	878
Cash and cash equivalents, including restricted cash, at beginning of period	67,146	66,209
Cash and cash equivalents, including restricted cash, at end of period	$ 109,079	$ 67,087

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - 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, 2017		$ 215,165	$ 141,110	$ (762,079)	$ 180,201	$ 1,157,801	$ (546,582)	$ 44,714
Increase (Decrease) in Stockholders' Equity
Net income		19,577				17,808		1,769
Cash dividends declared:
Sale of subsidiary shares to noncontrolling interest		477						477
Total other comprehensive income (loss), net of deferred income taxes of $(1,569) and $(3,909); and $1,729 and $467 for the three months ended June 30, 2019 and 2018 and the three months ended March 31, 2019 and 2019, respectively		6,163					4,885	1,278
Stock appreciation rights exercised, net		(26)	5	(26)	(5)
Vesting of restricted stock units and other stock grants, net		(683)	171	(683)	(171)
Amortization of unearned portion of stock-based compensation, net of forfeitures		3,285			3,285
Balances at Mar. 31, 2018		246,345	141,286	(762,788)	183,310	1,179,516	(543,217)	48,238
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
Cash dividends declared:
Total other comprehensive income (loss), net of deferred income taxes of $(1,569) and $(3,909); and $1,729 and $467 for the three months ended June 30, 2019 and 2018 and the three months ended March 31, 2019 and 2019, respectively		(11,027)
Balances at Jun. 30, 2018		266,153	141,812	(765,695)	185,512	1,219,992	(557,889)	42,421
Balances at Mar. 31, 2018		246,345	141,286	(762,788)	183,310	1,179,516	(543,217)	48,238
Increase (Decrease) in Stockholders' Equity
Net income		42,711				40,489		2,222
Cash dividends declared:
Noncontrolling interests		(5,521)						(5,521)
Total other comprehensive income (loss), net of deferred income taxes of $(1,569) and $(3,909); and $1,729 and $467 for the three months ended June 30, 2019 and 2018 and the three months ended March 31, 2019 and 2019, respectively		(17,190)					(14,672)	(2,518)
Stock appreciation rights exercised, net		(175)	34	(175)	(34)
Vesting of restricted stock units and other stock grants, net		(2,732)	492	(2,732)	(492)
Amortization of unearned portion of stock-based compensation, net of forfeitures		2,728			2,728
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)		(13)				(13)
Balances at Dec. 31, 2018		313,376	141,842	(795,821)	190,597	1,298,752	(567,107)	45,113
Increase (Decrease) in Stockholders' Equity
Net income		22,537				20,697		1,840
Cash dividends declared:
Sale of subsidiary shares to noncontrolling interest		876						876
Total other comprehensive income (loss), net of deferred income taxes of $(1,569) and $(3,909); and $1,729 and $467 for the three months ended June 30, 2019 and 2018 and the three months ended March 31, 2019 and 2019, respectively		4,531					4,111	420
Stock appreciation rights exercised, net		(8)	2	(8)	(2)
Vesting of restricted stock units and other stock grants, net		(1,456)	198	(1,456)	(198)
Vesting of performance share units, net		(8,248)	1,136	(8,235)	(1,149)
Amortization of unearned portion of stock-based compensation, net of forfeitures		3,664			3,664
Balances at Mar. 31, 2019		335,272	143,178	(805,520)	192,912	1,340,878	(584,425)	48,249
Balances at Dec. 31, 2018		313,376	141,842	(795,821)	190,597	1,298,752	(567,107)	45,113
Increase (Decrease) in Stockholders' Equity
Net income		33,466
Cash dividends declared:
Total other comprehensive income (loss), net of deferred income taxes of $(1,569) and $(3,909); and $1,729 and $467 for the three months ended June 30, 2019 and 2018 and the three months ended March 31, 2019 and 2019, respectively		8,129
Balances at Jun. 30, 2019		349,114	143,394	(807,003)	195,034	1,349,520	(580,229)	48,398
Balances at Mar. 31, 2019		335,272	143,178	(805,520)	192,912	1,340,878	(584,425)	48,249
Increase (Decrease) in Stockholders' Equity
Net income		10,929				8,642		2,287
Cash dividends declared:
Noncontrolling interests		(4,690)						(4,690)
Total other comprehensive income (loss), net of deferred income taxes of $(1,569) and $(3,909); and $1,729 and $467 for the three months ended June 30, 2019 and 2018 and the three months ended March 31, 2019 and 2019, respectively		3,598					4,196	(598)
Contribution receivable from noncontrolling interest	[1]	3,150						3,150
Stock appreciation rights exercised, net		(108)	18	(108)	(18)
Vesting of restricted stock units and other stock grants, net		(1,375)	198	(1,375)	(198)
Amortization of unearned portion of stock-based compensation, net of forfeitures		2,338			2,338
Balances at Jun. 30, 2019		$ 349,114	$ 143,394	$ (807,003)	$ 195,034	$ 1,349,520	$ (580,229)	$ 48,398
[1]	Cash contribution was received during July 2019.

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]
Total other comprehensive income, deferred income taxes	$ 1,729	$ (3,909)	$ 467	$ (1,569)
Vesting of restricted stock units and other stock grants (in shares)	94,229	266,803	102,695	99,134
Stock appreciation rights exercised (in shares)	927	20,024	2,560	10,216
Vesting of performance share units (in shares)	529,213

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2019
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 information and disclosure required by U.S. GAAP for annual financial statements. The December 31, 2018 Condensed Consolidated Balance Sheet information contained in this Quarterly Report on Form 10-Q was derived from the 2018 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, 2018 . 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. Additionally, in May 2019, the former Harsco Metals & Minerals Segment was rebranded as the Harsco Environmental Segment. Acquisition of Clean Earth On June 28, 2019, the Company completed the previously announced acquisition of CEHI Acquisition Corporation and Subsidiaries ("Clean Earth"), a leader in processing specialty waste and hazardous and non-hazardous waste from Compass Diversified Holdings for approximately $628 million in cash, subject to post-closing adjustments. See Note 3, Acquisitions and Dispositions, for additional information. Segment Reporting The Company reports information about operating segments using the "management approach," which is based on the way management organizes and reports the segments within the enterprise for making operating decisions and assessing performance. The Company's reportable segments are identified based upon differences in products, services and markets served. The Company has determined that the operations of Clean Earth represent a separate reportable segment. Discontinued Operations In May 2019, the Company entered into a definitive agreement to sell the Harsco Industrial Air-X-Changers ("AXC") business to Chart Industries, Inc. for $592 million in cash, subject to post-closing adjustments and announced the Company's intent to divest the remainder of the businesses in the Harsco Industrial Segment, Harsco Industrial IKG ("IKG") and Harsco Industrial Patterson-Kelley ("PK"). The Company completed the sale of AXC on July 1, 2019 and the sale of the remaining businesses is expected to occur within one year. Additionally, these disposals represent a strategic shift and accelerate the transformation of the Company's portfolio of businesses into a leading provider of environmental solutions and services. As a result of these disposals (i) the carrying value of assets and liabilities of the Harsco Industrial Segment have been classified as Assets-held-for-sale and Liabilities of assets-held-for-sale on the Company's Condensed Consolidated Balance Sheets; (ii) the operating results of the Harsco Industrial Segment, costs directly related to the disposals and an allocation of interest expense associated with mandatory debt repayments required as a result of the disposals have been reflected in the Company's Condensed Consolidated Statements of Operations as discontinued operations for all periods presented; and (iii) all disclosures have been updated to reflect these changes. See Note 3, Acquisitions and Dispositions, for additional information. 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, 2019
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 2019: On January 1, 2019, the Company adopted changes issued by the Financial Accounting Standards Board (“FASB”) related to accounting for leases. The changes introduce a lessee model that brings most leases onto the balance sheet. 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 lease 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 elected the package of practical expedients permitted under the transition, which among other items, allowed the carry forward of the historical lease classification. The Company has elected to apply the transition requirements at the January 1, 2019 effective date and therefore, comparative information has not been restated and continues to be reported under U.S. GAAP in effect for those periods. The changes had a significant impact on the Company's Condensed Consolidated Balance Sheets upon adoption and the Company recorded Right-of-use ("ROU") assets and lease liabilities of $34.0 million and $34.2 million , respectively. The difference between the ROU assets and lease liabilities was recorded primarily as adjustments to other assets and liabilities where prepaid rent and deferred expenses were previously recorded. Additionally, the Company's accounting for finance leases remained consistent. The changes did not have an impact on the Company’s Condensed Consolidated Statements of Operations or Condensed Consolidated Statements of Cash Flows. The discount rates used to calculate the ROU assets and lease liabilities as of the effective date were based on the remaining lease terms as of the effective date. See Note 6, Leases, for additional information. On January 1, 2019, the Company adopted changes issued by the FASB 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. Upon adoption, the Company’s recognition model for the excluded component was modified from a mark-to-market approach to an amortization approach for hedging relationships. Hedging relationships entered into on or after January 1, 2019 will be under the amortization approach while those entered into before January 1, 2019 will continue to be recognized under the mark-to-market approach. As such, there was no effect of applying this election reflected as an adjustment to Accumulated other comprehensive loss with a corresponding adjustment to the opening balance of Retained earnings. Presentation and disclosure amendments are required to be applied prospectively. Other than required expanded disclosures, the adoption of these changes did not have a material impact on the Company's condensed consolidated financial statements. On January 1, 2019, the Company adopted changes issued by the FASB which allow entities to reclassify stranded income tax effects resulting from the Tax Cuts and Jobs Act (the “Tax Act”) from accumulated other comprehensive income to retained earnings in the consolidated financial statements. Under the Tax 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 adoption of these changes resulted in the Company reclassifying approximately $21 million of stranded income tax effects into Retained earnings. The following accounting standards have been issued and become effective for the Company at a future date: In June 2016, the FASB issued changes, as amended, which update the impairment model by requiring entities to use a forward-looking approach based on expected losses rather than incurred losses to estimate credit losses on certain types of financial instruments, including trade receivables. This may result in the earlier recognition of allowances for losses. The changes become effective for the Company on January 1, 2020, with early adoption permitted. Management has not yet completed the assessment of the impact of the new standard on the Company’s condensed consolidated financial statements. 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 2018, the FASB issued changes which modify the disclosure requirements for fair value measurements. The amendments in this update remove the requirement to disclose the amount of, and reasons for, transfers between Level 1 and Level 2 of the fair value hierarchy; the policy for timing of transfers between levels; and the valuation processes for Level 3 fair value measurements. The changes require disclosure of changes in unrealized gains and losses for the period included in other comprehensive income (loss) for recurring Level 3 fair value measurements held at the end of the reporting period and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The changes become effective for the Company on January 1, 2020. Other than required expanded disclosures, the adoption of these changes will not have a material impact on the Company's condensed consolidated financial statements. In August 2018, the FASB issued changes which modify the disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans. The changes remove the requirements to disclose: amounts in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year; the amount and timing of plan assets expected to be returned to the employer; and the effects of a one-percentage point change in assumed health care cost trend rates. The update also requires disclosure of an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. The changes become effective for the Company on January 1, 2021. Management does not believe these changes will have a material impact on its condensed consolidated financial statements.

Acquisitions and Dispositions

Acquisitions and Dispositions	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Clean Earth On June 28, 2019, the Company acquired 100% of the outstanding stock of Clean Earth, one of the largest U.S. providers of environmental services for a variety of contaminated materials including soils, dredged material and hazardous waste, for an enterprise valuation of approximately $625 million on a cash free, debt free basis. The Company transferred approximately $628 million of cash consideration, subject to post-closing adjustments, and agreed to reimburse the sellers for any usage of assumed net operating losses in a post-closing period for up to five years , the present value of which is estimated at approximately $8 million . Clean Earth provides solutions that analyze, treat, document and recycle waste streams generated by multiple end-markets such as infrastructure, chemicals, aerospace and defense, non-public/private development, medical, industrial and dredging. Clean Earth treatment processes include thermal desorption, dredged material stabilization, bioremediation, physical treatment/screen and chemical fixation. Clean Earth operates 27 permitted facilities in the U.S. and maintains a portfolio of more than 200 scarce and difficult-to-replicate permits with a 100% permit renewal success rate to date. In addition, Clean Earth owns 9 Resource Conservation and Recovery Act (RCRA) Part B Permits which include 6 Treatment, Storage and Disposal Facility (TSDF) permits that enable the Company to process complex and highly recurring hazardous waste streams. Clean Earth is expected to generate approximately $300 million of full-year revenue in 2019. The fair value recorded for the assets acquired and liabilities assumed for Clean Earth is as follows: (In millions) Preliminary Valuation June 28, 2019 Cash and cash equivalents (a) $ 42.8 Trade accounts receivable, net 63.7 Other receivables 0.8 Other current assets 8.7 Property, plant and equipment 75.6 Right-of-use assets 14.4 Goodwill 313.8 Intangible assets 261.1 Other assets 4.0 Accounts payable (23.0 ) Acquisition consideration payable (a) (39.2 ) Other current liabilities (20.5 ) Net deferred taxes liabilities (51.2 ) Operating lease liabilities (11.1 ) Other liabilities (b) (11.9 ) Total identifiable net assets of Clean Earth $ 628.0 (a) Acquisition consideration payable represents a portion of the cash consideration not paid out until July 2019. (b) Includes $2.8 million of fair value related to a contingent consideration liability resulting from a prior Clean Earth acquisition. 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 $16.3 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 Clean Earth: (Dollars in millions) Weighted-Average Amortization Period Preliminary Valuation June 28, 2019 Permits and rights 18 years $ 176.1 Customer relationships 6 years 33.4 Air rights Usage based 25.6 Trade names 11.5 years 26.0 Total identifiable intangible assets of Clean Earth $ 261.1 The Company valued the identifiable intangible assets using an income-based approach that utilized either the multi-period excess earnings method or the relief from royalty method. The purchase price allocation for Clean Earth is not final and the fair value of intangible assets and goodwill may vary significantly from those reflected in the Company's condensed consolidated financial statements at June 30, 2019 . The three and six months ended June 30, 2019 include Clean Earth direct acquisition costs of $12.0 million and $12.5 million , respectively, which are included in Selling, general and administrative expenses in the Company’s Condensed Consolidated Statements of Operations. In addition to the acquisition-related costs reflected in the Company’s Condensed Consolidated Statements of Operations, the debt issuance costs associated with the issuance of debt to fund the acquisition are reflected, net of amortization subsequent to the acquisition date, as Long-term debt on the Company’s Condensed Consolidated Balance Sheets. The Company's acquisition of Clean Earth closed on June 28, 2019 and revenues and operating income for the three and six months ended June 30, 2019 for the Harsco Clean Earth Segment are immaterial. The pro forma information below gives effect to the Clean Earth acquisition as if it had been completed on January 1, 2018 (the “pro forma period”). The pro forma information is not necessarily indicative of the Company’s results of operations had the acquisition been completed on the above date, nor is it necessarily indicative of future results. The pro forma information does not reflect any cost savings from operating efficiencies or synergies that could result from the acquisition and does not reflect the additional revenue opportunities following the acquisition. The pro forma information below includes adjustments to reflect additional depreciation and amortization expense based on the estimated fair value and useful lives of intangible assets and fixed assets acquired; includes additional interest expense of approximately $9.2 million and $18.2 million for the three and six months ended June 30, 2019, respectively and $9.0 million and $17.9 million for the three and six months ended June 30, 2018, respectively, on the acquisition related borrowings used to finance the Clean Earth acquisition; and excludes certain directly attributable transaction costs and historic Clean Earth interest expense. These pro forma adjustments are subject to change as additional analysis is performed. The values assigned to the assets acquired and liabilities assumed are based on preliminary valuations and are subject to change as the Company obtains additional information during the measurement period. Three Months Ended Six Months Ended June 30 June 30 (In millions) 2019 2018 2019 2018 Pro forma revenues $ 420.0 $ 410.1 $ 813.5 $ 792.8 Pro forma net income (including discontinued operations) 24.8 37.8 39.1 43.0 Altek 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 byproduct streams, reduce byproduct 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 cash consideration transferred included payments of $57.4 million , inclusive of normal working capital adjustments. In addition, the Company recognized contingent consideration with an initial fair value of $12.1 million as of the acquisition date. Altek's revenues and operating results have been included in the results of the Harsco Environmental Segment. Inclusion of pro forma financial information for this transaction is not necessary as the acquisition is immaterial to the Company's results of operations. The initial 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 fair value recorded for the assets acquired and liabilities assumed for Altek is as follows: Final Valuation (In millions) June 30 2018 Measurement Period Adjustments (b) March 31 2019 Cash and cash equivalents $ 1.7 $ — $ 1.7 Net working capital (1.5 ) 0.2 (1.3 ) Property, plant and equipment 3.3 — 3.3 Intangible assets 52.5 0.2 52.7 Goodwill 20.9 1.6 22.5 Net deferred tax liabilities (8.5 ) — (8.5 ) Other liabilities (0.3 ) — (0.3 ) Total identifiable net assets of Altek $ 68.1 $ 2.0 $ 70.1 (b) The measurement period adjustments did not have a material impact on the Company's previously reported operating results. The following table reflects the changes in the fair value of contingent consideration: (In thousands) Contingent Consideration Balance at December 31, 2018 $ 8,420 Fair value adjustment (c) (3,511 ) Foreign currency translation (68 ) Balance at June 30, 2019 $ 4,841 (c) The fair value adjustment resulted from the decreased probability of Altek achieving cumulative financial and non-financial performance goals within the required time frame. This amount is recorded in Other expenses, net on the Company's Condensed Consolidated Statements of Operations. Harsco Industrial Segment On May 8, 2019, the Company entered into a definitive agreement to sell AXC to Chart Industries, Inc. for $592 million in cash, subject to post-closing adjustments. The Company completed the sale of AXC on July 1, 2019. The final value of the transaction, transaction expenses and the anticipated net gain on the sale are being finalized. Also, in May 2019, the Company announced the intent to divest the remainder of the businesses in the Harsco Industrial Segment, IKG and PK. The sale of these businesses is expected to occur within one year. The disposal of the former Harsco Industrial Segment represents a strategic shift and accelerates the transformation of the Company's portfolio of businesses into a leading provider of environmental solutions and services. The former Harsco Industrial Segment's balance sheet positions as of June 30, 2019 and December 31, 2018 are presented as Assets held-for-sale and Liabilities of assets held-for-sale in the Company’s Condensed Consolidated Balance Sheets and are summarized as follows: (in thousands) June 30 December 31 Trade accounts receivable, net $ 53,789 $ 44,786 Other receivables 333 412 Inventories 20,407 16,926 Current portion of contract assets 15,352 12,124 Other current assets 1,558 984 Property, plant and equipment, net 39,337 37,107 Right-of-use assets, net 17,822 — Goodwill 6,839 6,839 Intangible assets, net 10,058 10,618 Deferred income tax assets 498 563 Other assets 189 204 Total assets $ 166,182 $ 130,563 Accounts payable $ 21,415 $ 24,426 Accrued compensation 4,988 7,385 Current portion of advances on contracts 2,792 1,910 Current portion of operating lease liabilities 2,872 — Other current liabilities 6,010 5,689 Operating lease liabilities 15,180 — Other liabilities 369 555 Total liabilities $ 53,626 $ 39,965 The Harsco Industrial Segment has historically been a separate reportable segment with primary operations in North America and Latin America. In accordance with U.S. GAAP, the results of the former Harsco Industrial Segment are presented as discontinued operations and, as such, have been excluded from both continuing operations and segment results for the three and six months ended June 30, 2019 and 2018 . Certain key selected financial information included in net income from discontinued operations for the former Harsco Industrial Segment is as follows: Three Months Ended Six Months Ended June 30 June 30 (In millions) 2019 2018 2019 2018 Amounts directly attributable to the former Harsco Industrial Segment: Total revenues $ 116,796 $ 92,065 $ 234,182 $ 175,663 Cost of products sold 85,319 66,640 173,014 127,365 Income before income taxes 9,882 11,251 24,074 21,075 Additional amounts allocated to the former Harsco Industrial Segment: Selling, general and administrative expenses (d) $ 3,527 $ — $ 3,527 $ — Interest expense (e) 7,005 4,295 11,237 8,257 (d) The Company has allocated directly attributable transaction costs to discontinued operations. (e) The Company has allocated interest expense, including a portion of the amount reclassified into income for the Company's interest rate swaps, amortization of deferred financing costs, and the impact of interest rate swap terminations, all of which were directly associated with the mandatory repayment of the Company's Term Loan Facility, resulting from the AXC disposal, as part of discontinued operations. The Company has retained corporate overhead expenses previously allocated to the Harsco Industrial Segment of $1.4 million and $2.8 million for both the three and six months ended June 30, 2018 and 2019, respectively, as part of Selling, general and administrative expenses on the Company's Condensed Consolidated Statements of Operations. The following is selected financial information included on the Company's Condensed Consolidated Statements of Cash Flows attributable to the former Harsco Industrial Segment: Six Months Ended June 30 (In millions) 2019 2018 Non-cash operating items Depreciation and amortization $ 3,301 $ 3,737 Cash flows from investing activities Purchases of property, plant and equipment 5,221 4,003

Accounts Receivable and Invento

Accounts Receivable and Inventories	6 Months Ended
	Jun. 30, 2019
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 $ 344,268 $ 251,013 Less: Allowance for doubtful accounts (10,911 ) (4,586 ) Trade accounts receivable, net $ 333,357 $ 246,427 Other receivables (a) $ 53,019 $ 53,770 (a) Other receivables include insurance claims, employee receivables, tax claims and other miscellaneous items 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) 2019 2018 2019 2018 Provision (benefit) for doubtful accounts related to trade accounts receivable (b) $ 5,433 $ (125 ) $ 5,423 $ (208 ) (b) The increase in the provision for doubtful accounts primarily resulted from a $5.4 million provision for doubtful accounts in the Harsco Environmental Segment related to a customer in the U.K. entering administration during the second quarter of 2019. The Company continues to provide services to the customer and continues to collect on post-administration invoices timely while the customer seeks a buyer for their operations. Depending on the outcome of any potential transactions, there could be an impact on the Company's results of operations, cash flows and asset valuations in the future, which may be material in any one period. Inventories consist of the following: (In thousands) June 30 December 31 Finished goods $ 12,731 $ 11,892 Work-in-process 14,447 20,839 Raw materials and purchased parts 80,432 61,547 Stores and supplies 26,280 21,907 Total inventories $ 133,890 $ 116,185 During 2016, 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 . The Company recorded an additional forward loss provision of $1.8 million during 2018. At June 30, 2019 , the entire remaining estimated forward loss provision of $6.6 million is included as Other current liabilities on the Company's 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. There are a number of key events expected to occur in 2019, including the finalization of the manufacturing designs for certain of the vehicles, and which could affect the cost estimates. Any adjustment to the cost estimates would be recorded when new information becomes available and could have a material impact on the Company’s results of operations in that period. The Company recognized $5.9 million and $7.5 million of revenues for the contracts with SBB at zero margin, on an over time basis, utilizing a cost-to-cost method for the three months ended June 30, 2019 and 2018 , respectively; and $10.6 million and $15.5 million for the six months ended June 30, 2019 and 2018 , respectively. For the three and six months ended June 30, 2019 and 2018 , consolidated product revenue gross margins were not significantly impacted by the revenue recognized under the SBB contracts. The Company has substantially completed the first contract and is approximately 33% complete on the second contract with SBB as of June 30, 2019 .

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
	Jun. 30, 2019
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 $ 30,427 $ 10,143 Land improvements 18,713 15,961 Buildings and improvements 180,640 163,037 Machinery and equipment 1,558,713 1,470,620 Uncompleted construction 61,750 36,968 Gross property, plant and equipment 1,850,243 1,696,729 Less: Accumulated depreciation (1,299,572 ) (1,263,936 ) Property, plant and equipment, net $ 550,671 $ 432,793

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Leases The Company leases certain property and equipment under noncancelable lease agreements. The Company determines if a contract or arrangement contains a lease at inception. All leases are evaluated and classified as either an operating or finance lease. A lease is classified as a finance lease if any of the following criteria are met: (i) ownership of the underlying asset transfers to the Company by the end of the lease term; (ii) the lease contains an option to purchase the underlying asset that the Company is reasonably expected to exercise; (iii) the lease term is for a major part of the remaining economic life of the underlying asset; (iv) the present value of the sum of lease payments and any residual value guaranteed by the Company equals or exceeds substantially all of the fair value of the underlying asset; or (v) the underlying asset is of a specialized nature that it is expected to have no alternative use to the lessor at the end of the lease term. A lease that does not meet any of the criteria to be classified as a finance lease is classified as an operating lease. Operating leases are included as Right-of-use assets, net, Current portion of operating lease liabilities, and Operating lease liabilities on the Company's Condensed Consolidated Balance Sheets. ROU assets and operating lease liabilities are recognized based on the present value of the future lease payments over the lease term at the commencement date. As most of the Company’s leases do not provide an implicit rate for use in determining the present value of future payments, the Company uses an incremental borrowing rate. This incremental borrowing rate reflects the creditworthiness of the Company for a lending period commensurate to the term of the lease and the standard lending practices related to such loans in the respective jurisdiction where the underlying assets are located. ROU assets also include any lease payments made and exclude any lease incentives and initial direct costs incurred. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term, including rent abatement periods and rent holidays. Finance leases are included as Property, plant and equipment, net; Current maturities of long-term debt and Long-term debt on the Company's Condensed Consolidated Balance Sheets. Finance lease costs are split between depreciation expense related to the asset and interest expense on the lease liability, using the effective rate charged by the lessor. The Company has lease agreements with both lease and non-lease components, which the Company has elected to account for as a single lease component. Additionally, the Company has elected not to record short-term leases, those with expected terms of twelve months or less, on the Company's Condensed Consolidated Balance Sheets. Certain lease agreements include fixed escalations, while others include rental payments adjusted periodically for inflation. There are no material residual value guarantees or material restrictive covenants. The Company's leases, excluding short-term leases, have remaining terms of less than one year to 24.3 years, some of which include options to extend for up to 20 years, and some of which include options to terminate within one year . The components of lease expense were as follows: Three Months Ended Six Months Ended (In thousands) June 30 June 30 Finance leases: Amortization expense $ 312 $ 586 Interest on lease liabilities 37 41 Operating leases 3,435 7,127 Short-term leases 4,818 9,388 Variable lease expense — 221 Total lease expense from continuing operations $ 8,602 $ 17,363 Supplemental cash flow information related to leases was as follows: Six Months Ended (In thousands) June 30 Cash paid for amounts included in the measurement of lease liabilities: Cash flows from operating activities - Operating leases $ 6,743 Cash flows from financing activities - Finance leases 637 Right-of-use assets obtained in exchange for lease obligations: Operating leases (a) $ 50,696 Finance leases 1,692 (a) Includes ROU assets of approximately $34 million that were recorded upon adoption at January 1, 2019 and $14.4 million that were recorded upon the acquisition of Clean Earth. See Note 2, Recently Adopted and Recently Issued Accounting Standards, and Note 3, Acquisitions and Dispositions, for additional information. Supplemental balance sheet information related to leases was as follows: (In thousands) June 30 Operating Leases: Operating lease right-of-use assets $ 44,145 Other current liabilities 12,960 Operating lease liabilities 31,440 Finance Leases: Property, plant and equipment, net $ 2,356 Current maturities of long-term debt 1,216 Long-term debt 1,171 Supplemental additional information related to leases is as follows: June 30 Other information: Weighted average remaining lease term - Operating leases (in years) 5.00 Weighted average remaining lease term - Finance leases (in years) 3.03 Weighted average discount rate - Operating leases 6.1 % Weighted average discount rate - Finance leases 4.3 % Maturities of lease liabilities were as follows: (In thousand) Operating Leases Finance Leases Year Ending December 31 st : 2019 (excluding the six months ended June 30, 2019) $ 8,391 $ 626 2020 13,387 913 2021 9,838 667 2022 5,999 216 2023 4,320 100 After 2023 13,634 26 Total lease payments 55,569 2,548 Less imputed interest (11,169 ) (161 ) Total $ 44,400 $ 2,387 As previously disclosed, under then in effect lease accounting in accordance with U.S. GAAP, future minimum payments under operating leases with noncancelable terms were as follows as of December 31, 2018: (In thousands) (b) 2019 $ 10,761 2020 8,938 2021 6,235 2022 4,602 2023 3,083 After 2023 17,170 (b) These amounts do not include operating lease obligations of Clean Earth as of December 31, 2018. As of June 30, 2019 , the Company has additional operating leases for property and equipment that have not yet commenced with estimated ROU assets and lease liabilities of approximately $1 million
Leases	Leases The Company leases certain property and equipment under noncancelable lease agreements. The Company determines if a contract or arrangement contains a lease at inception. All leases are evaluated and classified as either an operating or finance lease. A lease is classified as a finance lease if any of the following criteria are met: (i) ownership of the underlying asset transfers to the Company by the end of the lease term; (ii) the lease contains an option to purchase the underlying asset that the Company is reasonably expected to exercise; (iii) the lease term is for a major part of the remaining economic life of the underlying asset; (iv) the present value of the sum of lease payments and any residual value guaranteed by the Company equals or exceeds substantially all of the fair value of the underlying asset; or (v) the underlying asset is of a specialized nature that it is expected to have no alternative use to the lessor at the end of the lease term. A lease that does not meet any of the criteria to be classified as a finance lease is classified as an operating lease. Operating leases are included as Right-of-use assets, net, Current portion of operating lease liabilities, and Operating lease liabilities on the Company's Condensed Consolidated Balance Sheets. ROU assets and operating lease liabilities are recognized based on the present value of the future lease payments over the lease term at the commencement date. As most of the Company’s leases do not provide an implicit rate for use in determining the present value of future payments, the Company uses an incremental borrowing rate. This incremental borrowing rate reflects the creditworthiness of the Company for a lending period commensurate to the term of the lease and the standard lending practices related to such loans in the respective jurisdiction where the underlying assets are located. ROU assets also include any lease payments made and exclude any lease incentives and initial direct costs incurred. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term, including rent abatement periods and rent holidays. Finance leases are included as Property, plant and equipment, net; Current maturities of long-term debt and Long-term debt on the Company's Condensed Consolidated Balance Sheets. Finance lease costs are split between depreciation expense related to the asset and interest expense on the lease liability, using the effective rate charged by the lessor. The Company has lease agreements with both lease and non-lease components, which the Company has elected to account for as a single lease component. Additionally, the Company has elected not to record short-term leases, those with expected terms of twelve months or less, on the Company's Condensed Consolidated Balance Sheets. Certain lease agreements include fixed escalations, while others include rental payments adjusted periodically for inflation. There are no material residual value guarantees or material restrictive covenants. The Company's leases, excluding short-term leases, have remaining terms of less than one year to 24.3 years, some of which include options to extend for up to 20 years, and some of which include options to terminate within one year . The components of lease expense were as follows: Three Months Ended Six Months Ended (In thousands) June 30 June 30 Finance leases: Amortization expense $ 312 $ 586 Interest on lease liabilities 37 41 Operating leases 3,435 7,127 Short-term leases 4,818 9,388 Variable lease expense — 221 Total lease expense from continuing operations $ 8,602 $ 17,363 Supplemental cash flow information related to leases was as follows: Six Months Ended (In thousands) June 30 Cash paid for amounts included in the measurement of lease liabilities: Cash flows from operating activities - Operating leases $ 6,743 Cash flows from financing activities - Finance leases 637 Right-of-use assets obtained in exchange for lease obligations: Operating leases (a) $ 50,696 Finance leases 1,692 (a) Includes ROU assets of approximately $34 million that were recorded upon adoption at January 1, 2019 and $14.4 million that were recorded upon the acquisition of Clean Earth. See Note 2, Recently Adopted and Recently Issued Accounting Standards, and Note 3, Acquisitions and Dispositions, for additional information. Supplemental balance sheet information related to leases was as follows: (In thousands) June 30 Operating Leases: Operating lease right-of-use assets $ 44,145 Other current liabilities 12,960 Operating lease liabilities 31,440 Finance Leases: Property, plant and equipment, net $ 2,356 Current maturities of long-term debt 1,216 Long-term debt 1,171 Supplemental additional information related to leases is as follows: June 30 Other information: Weighted average remaining lease term - Operating leases (in years) 5.00 Weighted average remaining lease term - Finance leases (in years) 3.03 Weighted average discount rate - Operating leases 6.1 % Weighted average discount rate - Finance leases 4.3 % Maturities of lease liabilities were as follows: (In thousand) Operating Leases Finance Leases Year Ending December 31 st : 2019 (excluding the six months ended June 30, 2019) $ 8,391 $ 626 2020 13,387 913 2021 9,838 667 2022 5,999 216 2023 4,320 100 After 2023 13,634 26 Total lease payments 55,569 2,548 Less imputed interest (11,169 ) (161 ) Total $ 44,400 $ 2,387 As previously disclosed, under then in effect lease accounting in accordance with U.S. GAAP, future minimum payments under operating leases with noncancelable terms were as follows as of December 31, 2018: (In thousands) (b) 2019 $ 10,761 2020 8,938 2021 6,235 2022 4,602 2023 3,083 After 2023 17,170 (b) These amounts do not include operating lease obligations of Clean Earth as of December 31, 2018. As of June 30, 2019 , the Company has additional operating leases for property and equipment that have not yet commenced with estimated ROU assets and lease liabilities of approximately $1 million

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2019
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, 2019 : (In thousands) Harsco Environmental Segment Harsco Clean Earth Segment Harsco Rail Segment Consolidated Totals Balance at December 31, 2018 $ 391,687 $ — $ 13,026 $ 404,713 Changes to goodwill (a) — 313,806 — 313,806 Foreign currency translation (792 ) — — (792 ) Balance at June 30, 2019 $ 390,895 $ 313,806 $ 13,026 $ 717,727 (a) The changes to goodwill related to the acquisition of Clean Earth. See Note 3, Acquisitions and Dispositions, for additional information. 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, 2019 , no interim goodwill impairment testing was necessary. Intangible assets, net on the Company's Condensed Consolidated Balance Sheets consist of the following: June 30, 2019 December 31, 2018 (In thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Customer related $ 154,835 $ 94,593 $ 122,379 $ 93,580 Permits 176,121 — — — Technology related 34,920 3,690 35,831 2,681 Trade names 31,542 858 5,565 681 Air rights 25,584 — — Patents 262 171 2,598 2,503 Other 3,817 1,081 4,215 1,936 Total $ 427,081 $ 100,393 $ 170,588 $ 101,381 Amortization expense for intangible assets was as follows: Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Amortization expense for intangible assets $ 1,901 $ 1,197 $ 3,840 $ 2,027 The estimated amortization expense for the next five fiscal years based on current intangible assets is as follows: (In thousands) 2019 2020 2021 2022 2023 Estimated amortization expense (b) $ 18,700 $ 29,500 $ 26,250 $ 23,000 $ 23,000 (b) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange fluctuations.

Debt and Credit Agreements

Debt and Credit Agreements	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Debt and Credit Agreements	Debt and Credit Agreements During June 2019, the Company completed a private placement of $500.0 million principal amount of senior unsecured notes (the "Notes"). The Notes are due July 31, 2027 and bear interest at a fixed rate of 5.75% , which is payable on January 31 and July 31 of each year, beginning on January 31, 2020. The Notes are fully and unconditionally guaranteed, jointly and severally, by all of the wholly owned domestic subsidiaries of the Company that guarantee the Senior Secured Credit Facility. The indenture governing the Notes contains provisions that (i) allow the Company to redeem some or all of the Notes prior to maturity; (ii) require the Company to offer to repurchase all of the Notes upon a change in control; and (iii) require adherence to certain covenants which are generally less restrictive than those included in the Company's Senior Secured Credit Facility. The Notes were used, together with borrowings under the Company's Revolving Credit Facility, to fund the acquisition of Clean Earth. See Note 3, Acquisitions and Dispositions, for additional information. Additionally, during June 2019, the Company amended the existing Senior Secured Credit Facility to, among other things, increase the borrowing capacity of the Revolving Credit Facility by $200 million to a total of $700 million , extend the maturity date of the Revolving Credit Facility until June 2024 and increase the maximum net debt to consolidated adjusted earnings before interest, tax, depreciation and amortization ratio from 3.5 to 4.0 . During the second quarter of 2019, $0.7 million of expenses were recognized related to the amended Senior Secured Credit Facility. The Company has capitalized approximately $11 million of fees related to the issuance of the Notes and the amendment of the Revolving Credit Facility, of which $9.5 million was paid as of June 30, 2019. In addition, during the second quarter of 2019, the Company recognized $6.7 million of expenses for fees and other costs related to bridge financing commitments that the Company arranged in the event that the Notes were not issued prior to the acquisition of Clean Earth. Because the Notes were issued prior to completion of the Clean Earth acquisition, the bridge financing commitments were not utilized. In July 2019, the Company made a required prepayment of $320.9 million on the $550 million Term Loan Facility, using proceeds from the sale of AXC. As a result of this prepayment, the Company expects to write off approximately $5 million of previously recorded deferred financing costs during July 2019. The prepayment was used to satisfy the remaining quarterly principal payment requirements under the Term Loan Facility and further reduce amounts outstanding. Long-term debt consists of the following: (In thousands) June 30 2019 December 31 Senior Secured Credit Facilities: Term Loan Facility $ 539,065 $ 541,788 Revolving Credit Facility 302,000 62,000 5.75% Notes, due 2027 500,000 — Other financing payable (including finance leases) in varying amounts due principally through 2019 2,773 1,606 Total debt obligations 1,343,838 605,394 Less: deferred financing costs (23,155 ) (13,243 ) Total debt obligations, net of deferred financing costs 1,320,683 592,151 Less: current maturities of long-term debt (6,840 ) (6,489 ) Long-term debt $ 1,313,843 $ 585,662

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans Three Months Ended June 30 Defined Benefit Pension Plans Net Periodic Pension Cost (Benefit) U.S. Plans International Plans (In thousands) 2019 2018 2019 2018 Service costs $ 10 $ 11 $ 357 $ 408 Interest costs 2,651 2,390 5,548 5,442 Expected return on plan assets (2,593 ) (3,017 ) (9,319 ) (10,696 ) Recognized prior service costs — — 65 (37 ) Recognized loss 1,405 1,302 3,577 3,690 Settlement/curtailment losses 129 — — — Defined benefit pension plans net periodic pension cost (benefit) $ 1,602 $ 686 $ 228 $ (1,193 ) Six Months Ended Jun 30 Defined Benefit Pension Plans Net Periodic Pension Cost (Benefit) U.S. Plans International Plans (In thousands) 2019 2018 2019 2018 Service costs $ 20 $ 21 $ 713 $ 794 Interest costs 5,302 4,781 11,212 11,114 Expected return on plan assets (5,186 ) (6,034 ) (18,836 ) (21,841 ) Recognized prior service costs — — 131 (76 ) Recognized loss 2,810 2,604 7,230 7,530 Settlement/curtailment losses 129 166 — — Defined benefit pension plans net periodic pension cost (benefit) $ 3,075 $ 1,538 $ 450 $ (2,479 ) Three Months Ended Six Months Ended Company Contributions June 30 June 30 (In thousands) 2019 2018 2019 2018 Defined benefit pension plans (U.S.) $ 2,011 $ 2,067 $ 3,490 $ 3,351 Defined benefit pension plans (International) 3,131 3,239 12,401 12,973 Multiemployer pension plans 483 519 1,004 1,020 Defined contribution pension plans 2,969 2,747 6,359 5,582 The Company's estimate of expected contributions to be paid during the remainder of 2019 for the U.S. and international defined benefit pension plans are $5.0 million and $7.8 million , respectively.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense related to continuing operations for the three and six months ended June 30, 2019 was $4.0 million and $5.2 million , respectively. Income tax benefit related to continuing operations for the three months ended June 30, 2018 was $0.5 million and income tax expense related to continuing operations for the six months ended June 30, 2018 was $5.7 million . Changes in income tax expense (benefit) during the periods presented primarily relate to a change in mix of taxable income and an $8.3 million income tax benefit arising from the release of adjustments to certain existing deferred tax asset valuation allowances as the result of the Altek acquisition in 2018 not recurring in 2019. 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, 2019 was $4.5 million , including interest and penalties. Within the next twelve months, it is reasonably possible that up to $0.1 million

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
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 byproduct 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. Other than set forth herein 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. 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 , which represents the Company's best estimate of the ultimate costs to be incurred to resolve this matter. 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. On July 27, 2018, Brazil’s Federal and Rio de Janeiro State Public Prosecution Offices (MPF and MPE) filed a Civil Public Action against one of the Company's customers (CSN), the Company’s Brazilian subsidiary, the Municipality of Volta Redonda, Brazil, and the Instituto Estadual do Ambiente (local environmental protection agency) seeking the implementation of various measures to limit and reduce the accumulation of customer-owned slag at the site in Brazil. On August 6, 2018, the 3rd Federal Court in Volta Redonda granted the MPF and MPE an injunction against the same parties requiring, among other things, CSN and the Company’s Brazilian subsidiary to limit the volume of slag sent to the site. Because the customer owns the site and the slag located on the site, the Company believes that complying with this injunction is the steel producer’s responsibility. On March 18, 2019, the Court issued an order fining the Company 5,000 Brazilian real per day (or approximately $1,300 per day) and CSN 20,000 Brazilian real per day until the requirements of the injunction are met. This fine is not yet currently being enforced, and the Company is appealing the fine and the underlying injunction. Both the Company and CSN continue to have discussions with the governmental authorities on the injunction and the possible resolution of the underlying case. The Company does not believe that a loss relating to this matter is probable or estimable at this point. On October 19, 2018, local environmental authorities issued an enforcement action against the Company concerning the Company’s operations at a customer site in Ijmuiden, Netherlands. The enforcement action alleges violations of the Company’s environmental permit at the site, which restricts the release of any visible dust emissions. The enforcement action ordered the Company to cease all violations of the permit by October 31, 2018. The authorities have issued fines of approximately $0.5 million , with the possibility of additional fines for any future violations. The Company is vigorously contesting the enforcement action and fines and is also working with its customer to ensure the control of emissions. The Company has contractual indemnity rights from its customer, should it be required to pay the assessed fines. On June 13, 2019, the Pennsylvania Department of Environmental Protection (“PA DEP”) indicated to the Company and a landowner who received processed slag from the Company that it plans to require action to bring the landowner’s site into compliance and to assess a civil penalty against the Company and the landowner. The landowner received the processed slag from the Company for use as construction material, one of the approved uses under the Company’s applicable permit, but the PA DEP alleges that the landowner failed to properly use the slag as construction material. The Company is working with the landowner and PA DEP to determine the most effective way to address PA DEP’s concerns about the site and has established a $0.4 million reserve, which represents the Company’s best estimate of the costs to bring the landowner's site into compliance. 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. Many 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, 2019 , 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 $22 million . On June 4, 2018, the Appellate 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 potential liability for this case to approximately $9 million . The Company has appealed the ruling in favor of the SPRA to the Superior Court of Justice. Due to multiple court precedents in the Company’s favor, as well as the Company’s ability to 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. In December 2018, the administrative tribunal hearing the case upheld the Company's liability. The Company has appealed to the judicial phase. The aggregate amount assessed by the tax authorities in August 2005 was $6.6 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 $1.6 million , with penalty and interest assessed through that date increasing such amount by an additional $5.0 million . On December 6, 2018, the administrative tribunal reduced the applicable penalties to $1.2 million . After calculating the interest accrued on the current penalty, the Company estimates that this ruling reduces the current overall liability for this case to approximately $10 million . All such amounts include the effect of foreign currency translation. Due to multiple court precedents in the Company's favor the Company does not believe a loss is probable. 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 Environmental 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. As of June 30, 2019 and December 31, 2018 , the Company has established reserves of $6.7 million and $7.1 million , respectively, on the Company's Condensed Consolidated Balance Sheets for amounts considered to be probable and estimable. 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 ongoing 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 $317 million plus interest in property damages, 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. 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 such liability that might ultimately be incurred in the above action. As a result, the Company believes the situation will not result in a net unreimbursed loss. 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, 2019 , there were approximately 17,131 pending asbestos personal injury actions filed against the Company. Of those actions, approximately 16,582 were filed in the New York Supreme Court (New York County), approximately 118 were filed in other New York State Supreme Court Counties and approximately 431 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, 2019 , approximately 16,550 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 approximately 32 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, 2019 , the Company has obtained dismissal in approximately 28,200 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. 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, 2018 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, 2019
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) 2019 2018 2019 2018 Income (loss) from continuing operations attributable to Harsco Corporation common stockholders $ (2,852 ) $ 31,110 $ 7,622 $ 41,613 Weighted-average shares outstanding: Weighted-average shares outstanding - basic 80,328 80,861 80,119 80,756 Dilutive effect of stock-based compensation — 2,782 1,955 2,838 Weighted-average shares outstanding - diluted 80,328 83,643 82,074 83,594 Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders: Basic $ (0.04 ) $ 0.38 $ 0.10 $ 0.52 Diluted $ (0.04 ) $ 0.37 $ 0.09 $ 0.50 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) 2019 2018 2019 2018 Restricted stock units 443 — — — Stock appreciation rights 1,919 283 389 489 Performance share units 685 — 116 —

Derivative Instruments, Hedging

Derivative Instruments, Hedging Activities and Fair Value	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities 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 Company's Condensed Consolidated Balance Sheets at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. 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 fair value of outstanding derivative contracts recorded as assets and liabilities on the Company's Condensed Consolidated Balance Sheets was as follows: (In thousands) Balance Sheet Location Fair Value of Derivatives Designated as Hedging Instruments Fair Value of Derivatives Not Designated as Hedging Instruments Total Fair Value June 30, 2019 Asset derivatives (Level 2): Foreign currency exchange forward contracts Other current assets $ 2,855 $ 4,261 $ 7,116 Total $ 2,855 $ 4,261 $ 7,116 Liability derivatives (Level 2): Foreign currency exchange forward contracts Other current liabilities $ 36 $ 797 $ 833 Interest rate swaps Other current liabilities 1,227 — 1,227 Interest rate swaps Other liabilities 4,631 — 4,631 Total $ 5,894 $ 797 $ 6,691 December 31, 2018 Asset derivatives (Level 2): Foreign currency exchange forward contracts Other current assets $ 2,970 $ 589 $ 3,559 Interest rate swaps Other current assets 1,331 — 1,331 Interest rate swaps Other assets 128 — $ 128 Total $ 4,429 $ 589 $ 5,018 Liability derivatives (Level 2): Foreign currency exchange forward contracts Other current liabilities $ 24 $ 2,910 $ 2,934 Interest rate swaps Other liabilities 1,849 — 1,849 Total $ 1,873 $ 2,910 $ 4,783 All of the Company's derivatives are recorded on the Company's 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 liability of $1.5 million and $0.1 million at June 30, 2019 and December 31, 2018 , respectively. The effect of derivative instruments on the Company's Condensed Consolidated Statements of Operations and Condensed Consolidated Statements of Comprehensive Income: Derivatives Designated as Hedging Instruments Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives Location of Amount Reclassified from Accumulated OCI into Income Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity Three Months Ended Three Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Foreign currency exchange forward contracts $ 669 $ 1,539 Product revenues/Cost of services sold $ (389 ) $ 103 Interest rate swaps — — Income from discontinued businesses 2,741 — Interest rate swaps (4,327 ) 2,071 Interest expense (271 ) (235 ) Cross-currency interest rate swaps (a) 54 93 Interest expense 303 377 $ (3,604 ) $ 3,703 $ 2,384 $ 245 Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives Location of Amount Reclassified from Accumulated OCI into Income Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity Six Months Ended Six Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Foreign currency exchange forward contracts $ (43 ) $ 1,779 Product revenues/Cost of services sold $ (421 ) $ (109 ) Foreign currency exchange forward contracts (b) — — Retained earnings — (1,520 ) Interest rate swaps — — Income from discontinued businesses 2,741 — Interest rate swaps (7,636 ) 5,381 Interest expense (572 ) (235 ) Cross-currency interest rate swaps (a) 2 — Interest expense 617 648 $ (7,677 ) $ 7,160 $ 2,365 $ (1,216 ) (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. The location and amount of gain (loss) recognized on the Company's Condensed Consolidated Statements of Operations: Three Months Ended June 30 2019 2018 (in thousands) Product Revenues Cost of Services Sold Interest Expense Income From Discontinued Businesses Product Revenues Cost of Services Sold Interest Expense Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded $ 112,895 $ 186,840 $ (6,103 ) $ 9,936 $ 94,199 $ 187,393 $ (5,681 ) Interest rate swaps: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income — — 271 — — — 235 Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring — — — (2,741 ) — — — Foreign exchange contracts: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 433 (44 ) — — (103 ) — — Amount excluded from effectiveness testing recognized in earnings based on changes in fair value 238 — — — — 12 — Cross-currency interest rate swaps: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income — — (303 ) — — — (377 ) Six Months Ended June 30 2019 2018 (in thousands) Product Revenues Cost of Services Sold Interest Expense Income From Discontinued Businesses Product Revenues Cost of Services Sold Interest Expense Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded $ 213,277 $ 368,711 $ (11,610 ) $ 23,686 $ 174,429 $ 379,068 $ (11,271 ) Interest rate swaps: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income — — 572 — — — 235 Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring — — — (2,741 ) — — — Foreign exchange contracts: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 465 (44 ) — — 109 — — Amount excluded from effectiveness testing recognized in earnings based on changes in fair value 316 — — — — (7 ) — Cross-currency interest rate swaps: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income — — (617 ) — — — (648 ) Derivatives Not Designated as Hedging Instruments Location of Gain Recognized in Income on Derivatives Amount of Gain Recognized in Income on Derivatives (c) Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Foreign currency exchange forward contracts Cost of services and products sold $ 2,770 $ 15,731 $ 5,094 $ 10,265 (c) These gains 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. 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 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. 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 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. At June 30, 2019 and December 31, 2018 , the notional amounts of foreign currency exchange forward contracts were $460.2 million and $423.9 million , respectively. These contracts are primarily denominated in British pounds sterling and Euros and mature through October 2021 . 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 losses of $5.5 million and $0.7 million for the three and six months ended June 30, 2019 , respectively, and pre-tax net losses of $16.1 million and $6.6 million for the three and six months ended June 30, 2018 , respectively, in Accumulated other comprehensive loss . Interest Rate Swaps The Company uses interest rate swaps in conjunction with certain variable rate debt issuances in order to secure a fixed interest rate. Changes in the fair value attributed to the effect of the swaps’ interest spread and changes in the credit worthiness of the counter-parties are 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. The fixed rates provided by the swaps replace the adjusted LIBOR rate in the interest calculation, ranging from 2.12% for 2019 to 3.12% for 2022. During June 2019, the Company effected the early termination of interest rate swaps that covered the period from 2019 through 2022 and had the effect of converting $100.0 million of the Term Loan Facility from floating-rate to fixed-rate. This termination was conducted as a result of the Company's new Notes offering and required repayment of a portion of the Term Loan Facility with proceeds from the AXC disposal. The Company paid $2.8 million and recognized a loss of $2.7 million related to these terminations in Income from discontinued businesses on the Company's Condensed Consolidated Statements of Operations. The total notional of the Company's interest rate swaps is $200.0 million as of June 30, 2019 . 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. Changes in the fair value attributed to the effect of the swaps' interest spread and changes in the credit worthiness of the counter-parties are recorded in Accumulated other comprehensive loss. Changes in value attributed to the effect of foreign currency fluctuations are recorded on the Company's Condensed Consolidated Statements of Operations and offset currency fluctuation effects on the debt principal. The Company had no outstanding CCIRs at June 30, 2019 . Fair Value of Other Financial Instruments 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, 2019 and December 31, 2018 , the total fair value of long-term debt (excluding deferred financing costs), including current maturities, was $1,361.1 million and $592.0 million , respectively, compared with a carrying value of $1,343.8 million and $605.4 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, 2019
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) 2019 2018 2019 2018 Revenues From Continuing Operations (a) Harsco Environmental $ 269,338 $ 272,320 $ 530,650 $ 537,043 Harsco Clean Earth — — — — Harsco Rail 81,560 67,552 150,150 127,230 Corporate — 35 — 74 Total Revenues From Continuing Operations $ 350,898 $ 339,907 $ 680,800 $ 664,347 Operating Income (Loss) From Continuing Operations (a) Harsco Environmental $ 27,577 $ 35,661 $ 52,074 $ 63,396 Harsco Clean Earth — — — — Harsco Rail 9,443 8,618 14,832 10,570 Corporate (19,221 ) (6,215 ) (29,283 ) (13,174 ) Total Operating Income From Continuing Operations $ 17,799 $ 38,064 $ 37,623 $ 60,792 Depreciation and Amortization (a) Harsco Environmental $ 28,497 $ 28,632 $ 57,202 $ 57,717 Harsco Clean Earth — — — — Harsco Rail 1,209 1,039 2,376 2,103 Corporate 1,417 1,665 2,769 3,014 Total Depreciation and Amortization $ 31,123 $ 31,336 $ 62,347 $ 62,834 Capital Expenditures (a) Harsco Environmental $ 45,095 $ 24,423 $ 74,258 $ 49,599 Harsco Clean Earth — — — — Harsco Rail 6,365 2,088 10,281 2,518 Corporate 287 172 1,440 376 Total Capital Expenditures $ 51,747 $ 26,683 $ 85,979 $ 52,493 (a) The Company's acquisition of Clean Earth closed on June 28, 2019. Revenues and operating income for the three and six months ended June 30, 2019 for the Harsco Clean Earth Segment are immaterial. The operating results of the former Harsco Industrial Segment has been reflected as discontinued operations in the Company's Condensed Consolidated Statement of Operations for all periods presented. See Note 3, Acquisitions and Dispositions, for additional details. Reconciliation of Segment Operating Income to Income From Continuing Operations Before Income Taxes and Equity Income Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Segment operating income $ 37,020 $ 44,279 $ 66,906 $ 73,966 General Corporate expense (19,221 ) (6,215 ) (29,283 ) (13,174 ) Operating income from continuing operations 17,799 38,064 37,623 60,792 Interest income 591 577 1,124 1,070 Interest expense (6,103 ) (5,681 ) (11,610 ) (11,271 ) Unused debt commitment and amendment fees (7,435 ) — (7,435 ) — Loss on early extinguishment of debt — (1,034 ) — (1,034 ) Defined benefit pension income (expense) (1,472 ) 904 (2,810 ) 1,743 Income from continuing operations before income taxes and equity income $ 3,380 $ 32,830 $ 16,892 $ 51,300

Revenue Recognition

Revenue Recognition	6 Months Ended
	Jun. 30, 2019
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 Harsco Clean Earth Segment and the service components of the Harsco Environmental and Harsco Rail Segments. Product revenues include portions of the Harsco Environmental and Harsco Rail Segments. 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, 2019 (In thousands) Harsco Environmental Segment Harsco Clean Earth Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) (b) : North America $ 78,112 $ — $ 65,278 $ — $ 143,390 Western Europe 98,478 — 10,538 — 109,016 Latin America (c) 36,272 — 773 — 37,045 Asia-Pacific 35,779 — 4,971 — 40,750 Middle East and Africa 15,742 — — — 15,742 Eastern Europe 4,955 — — — 4,955 Total Revenues $ 269,338 $ — $ 81,560 $ — $ 350,898 Key Product and Service Groups (a) : On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems $ 269,338 $ — $ — $ — $ 269,338 Environmental solutions for contaminated materials, hazardous waste and dredged materials — — — — — Railway track maintenance services and equipment — — 81,560 — 81,560 Total Revenues $ 269,338 $ — $ 81,560 $ — $ 350,898 Three Months Ended June 30, 2018 (In thousands) Harsco Environmental Segment Harsco Clean Earth Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) (b) : North America $ 79,862 $ — $ 47,547 $ 35 $ 127,444 Western Europe 97,410 — 13,041 — 110,451 Latin America (c) 37,388 — 1,331 — 38,719 Asia-Pacific 37,788 — 5,633 — 43,421 Middle East and Africa 12,150 — — — 12,150 Eastern Europe 7,722 — — — 7,722 Total Revenues $ 272,320 $ — $ 67,552 $ 35 $ 339,907 Key Product and Service Groups (a) : On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems $ 272,320 $ — $ — $ — $ 272,320 Environmental solutions for contaminated materials, hazardous waste and dredged materials — — — — — Railway track maintenance services and equipment — — 67,552 — 67,552 General Corporate — — — 35 35 Total Revenues $ 272,320 $ — $ 67,552 $ 35 $ 339,907 Six Months Ended June 30, 2019 (In thousands) Harsco Environmental Segment Harsco Clean Earth Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) (b) : North America $ 151,461 $ — $ 115,643 $ — $ 267,104 Western Europe 196,699 — 20,551 — 217,250 Latin America (c) 73,263 — 1,364 — 74,627 Asia-Pacific 69,917 — 12,592 — 82,509 Middle East and Africa 29,657 — — — 29,657 Eastern Europe 9,653 — — — 9,653 Total Revenues $ 530,650 $ — $ 150,150 $ — $ 680,800 Key Product and Service Groups (a) : 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 $ 530,650 $ — $ — $ — $ 530,650 Environmental solutions for contaminated materials, hazardous waste and dredged materials — — — — — Railway track maintenance services and equipment — — 150,150 — 150,150 Total Revenues $ 530,650 $ — $ 150,150 $ — $ 680,800 Six Months Ended June 30, 2018 (In thousands) Harsco Environmental Segment Harsco Clean Earth Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) (b) : North America $ 150,927 $ — $ 87,952 $ 74 $ 238,953 Western Europe 194,331 — 27,761 — 222,092 Latin America (c) 78,846 — 2,164 — 81,010 Asia-Pacific 74,009 — 9,353 — 83,362 Middle East and Africa 23,703 — — — 23,703 Eastern Europe 15,227 — — — 15,227 Total Revenues $ 537,043 $ — $ 127,230 $ 74 $ 664,347 Key Product and Service Groups (a) : 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 Environmental solutions for contaminated materials, hazardous waste and dredged materials — — — — — Railway track maintenance services and equipment — — 127,230 — 127,230 General Corporate — — — 74 74 Total Revenues $ 537,043 $ — $ 127,230 $ 74 $ 664,347 (a) The Company's acquisition of Clean Earth closed on June 28, 2019. Revenues and operating income for the three and six months ended June 30, 2019 for the Harsco Clean Earth Segment are immaterial. The operating results of the former Harsco Industrial Segment have been reflected as discontinued operations in the Company's Condensed Consolidated Statement of Operations for all periods presented. See Note 3, Acquisitions and Dispositions, for additional details. (b) Revenues are attributed to individual countries based on the location of the facility generating the revenue. (c) Includes Mexico. The Company may receive payments in advance of earning revenue, which are treated as Advances on contracts on the Company's 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 Company's Condensed Consolidated Balance Sheets. 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. The Company had Contract assets totaling $8.2 million and $12.1 million at June 30, 2019 and December 31, 2018 , respectively. The decrease is due principally to the transfer of contract assets to accounts receivable in excess of additional contract assets recognized during the six months ended June 30, 2019, primarily in the Harsco Rail Segment. The Company had Advances on contracts totaling $55.4 million and $67.1 million at June 30, 2019 and December 31, 2018 , respectively. The decrease is due principally to the recognition of revenue on previously received advances on contracts in excess of receipts of new advances on contracts during the period, primarily in the Harsco Rail Segment. During the three and six months ended June 30, 2019 , the Company recognized approximately $19 million and approximately $37 million of revenue related to amounts previously included in Advances on contracts. At June 30, 2019 , the Harsco Environmental Segment had remaining, fixed, unsatisfied performance obligations where the expected contract duration exceeds one year totaling $124.2 million . Of this amount, $42.6 million is expected to be fulfilled by June 30, 2020, $31.1 million by June 30, 2021, $24.2 million by June 30, 2022, $21.3 million by June 30, 2023 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 decrease from December 31, 2018 is primarily due to changes in foreign currency exchange rates. At June 30, 2019 , the Harsco Rail Segment had remaining, fixed, unsatisfied performance obligations where the expected contract duration exceeds one year totaling $202.7 million . Of this amount, $93.3 million is expected to be fulfilled by June 30, 2020, $61.9 million by June 30, 2021, $34.4 million by June 30, 2022, $13.1 million by June 30, 2023. These amounts exclude any variable fees, fixed fees subject to indexation and any performance obligations expected to be satisfied within one year.

Other (Income) Expenses, Net

Other (Income) Expenses, Net	6 Months Ended
	Jun. 30, 2019
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) 2019 2018 2019 2018 Employee termination benefit costs $ 997 $ 769 $ 3,516 $ 2,174 Other costs to exit activities 1,192 (25 ) 2,347 227 Impaired asset write-downs — 104 214 104 Contingent consideration adjustments (3,880 ) — (3,511 ) — Net gains — (1,097 ) (2,271 ) (1,097 ) Other (26 ) (765 ) (269 ) (758 ) Other (income) expenses, net $ (1,717 ) $ (1,014 ) $ 26 $ 650

Components of Accumulated Other

Components of Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Components of Accumulated Other Comprehensive Loss	Components of Accumulated Other Comprehensive Loss Accumulated other comprehensive loss is included on the Company's 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, 2018 and 2019 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, 2017 $ (111,567 ) $ 808 $ (435,840 ) $ 17 $ (546,582 ) Adoption of new accounting standard (a) — (1,520 ) — — (1,520 ) Other comprehensive income (loss) before reclassifications (36,205 ) (b) 5,482 (c) 10,015 (b) (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 ) 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, 2018 $ (159,810 ) $ 1,389 $ (408,655 ) $ (31 ) $ (567,107 ) Adoption of new accounting standard (d) — — (21,429 ) — (21,429 ) Other comprehensive income (loss) before reclassifications 2,775 (b) (5,893 ) (c) 2,192 (b) 25 (901 ) Amounts reclassified from accumulated other comprehensive loss, net of tax (2,271 ) 1,722 9,579 — 9,030 Total other comprehensive income (loss) 504 (4,171 ) 11,771 25 8,129 Other comprehensive income attributable to noncontrolling interests 178 — — — 178 Other comprehensive income (loss) attributable to Harsco Corporation 682 (4,171 ) 11,771 25 8,307 Balance at June 30, 2019 $ (159,128 ) $ (2,782 ) $ (418,313 ) $ (6 ) $ (580,229 ) (a) 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. (b) Principally foreign currency fluctuation. (c) Net change from periodic revaluations. (d) Represents the adoption of the new accounting standard on January 1, 2019 related to stranded tax effects from the Tax Act. See Note 2, Recently Adopted and Recently Issued Accounting Standards, for more information. Amounts reclassified from Accumulated other comprehensive loss are as follows: (In thousands) Three Months Ended Six Months Ended Affected Caption on the Company's Condensed Consolidated Statements of Operations June 30 June 30 June 30 June 30 Recognition of cumulative foreign currency translation adjustments: Gain on substantial liquidation of subsidiary (e) $ — $ — $ (2,271 ) $ — Other (income) expenses, net Amortization of cash flow hedging instruments: Foreign currency exchange forward contracts $ (433 ) $ 103 $ (465 ) $ (109 ) Product revenues Foreign currency exchange forward contracts 44 — 44 — Cost of services sold Cross-currency interest rate swaps 303 377 617 648 Interest expense Interest rate swaps (271 ) (235 ) (572 ) (235 ) Interest expense Interest rate swaps 2,741 — 2,741 — Income from discontinued businesses Total before tax 2,384 245 2,365 304 Tax expense (599 ) (57 ) (643 ) (207 ) Total reclassification of cash flow hedging instruments, net of tax $ 1,785 $ 188 $ 1,722 $ 97 Amortization of defined benefit pension items (f) : Recognized losses $ 4,982 $ 4,992 $ 10,040 $ 10,134 Defined benefit pension income (expense) Recognized prior-service costs 65 (37 ) 131 (76 ) Defined benefit pension income (expense) Settlement/curtailment losses 129 — 129 166 Defined benefit pension income (expense) Total before tax 5,176 4,955 10,300 10,224 Tax benefit (379 ) (288 ) (721 ) (613 ) Total reclassification of defined benefit pension items, net of tax $ 4,797 $ 4,667 $ 9,579 $ 9,611 (e) No tax impact. (f) These accumulated other comprehensive loss components are included in the computation of net periodic pension costs. See Note 9, Employee Benefit Plans, for additional details.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2019
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 information and disclosure required by U.S. GAAP for annual financial statements. The December 31, 2018 Condensed Consolidated Balance Sheet information contained in this Quarterly Report on Form 10-Q was derived from the 2018 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, 2018 . 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. Additionally, in May 2019, the former Harsco Metals & Minerals Segment was rebranded as the Harsco Environmental Segment. Acquisition of Clean Earth On June 28, 2019, the Company completed the previously announced acquisition of CEHI Acquisition Corporation and Subsidiaries ("Clean Earth"), a leader in processing specialty waste and hazardous and non-hazardous waste from Compass Diversified Holdings for approximately $628 million in cash, subject to post-closing adjustments. See Note 3, Acquisitions and Dispositions, for additional information. Segment Reporting The Company reports information about operating segments using the "management approach," which is based on the way management organizes and reports the segments within the enterprise for making operating decisions and assessing performance. The Company's reportable segments are identified based upon differences in products, services and markets served. The Company has determined that the operations of Clean Earth represent a separate reportable segment. Discontinued Operations In May 2019, the Company entered into a definitive agreement to sell the Harsco Industrial Air-X-Changers ("AXC") business to Chart Industries, Inc. for $592 million in cash, subject to post-closing adjustments and announced the Company's intent to divest the remainder of the businesses in the Harsco Industrial Segment, Harsco Industrial IKG ("IKG") and Harsco Industrial Patterson-Kelley ("PK"). The Company completed the sale of AXC on July 1, 2019 and the sale of the remaining businesses is expected to occur within one year. Additionally, these disposals represent a strategic shift and accelerate the transformation of the Company's portfolio of businesses into a leading provider of environmental solutions and services. As a result of these disposals (i) the carrying value of assets and liabilities of the Harsco Industrial Segment have been classified as Assets-held-for-sale and Liabilities of assets-held-for-sale on the Company's Condensed Consolidated Balance Sheets; (ii) the operating results of the Harsco Industrial Segment, costs directly related to the disposals and an allocation of interest expense associated with mandatory debt repayments required as a result of the disposals have been reflected in the Company's Condensed Consolidated Statements of Operations as discontinued operations for all periods presented; and (iii) all disclosures have been updated to reflect these changes. See Note 3, Acquisitions and Dispositions, for additional information.
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted and Recently Issued Accounting Standards The following accounting standards have been adopted in 2019: On January 1, 2019, the Company adopted changes issued by the Financial Accounting Standards Board (“FASB”) related to accounting for leases. The changes introduce a lessee model that brings most leases onto the balance sheet. 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 lease 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 elected the package of practical expedients permitted under the transition, which among other items, allowed the carry forward of the historical lease classification. The Company has elected to apply the transition requirements at the January 1, 2019 effective date and therefore, comparative information has not been restated and continues to be reported under U.S. GAAP in effect for those periods. The changes had a significant impact on the Company's Condensed Consolidated Balance Sheets upon adoption and the Company recorded Right-of-use ("ROU") assets and lease liabilities of $34.0 million and $34.2 million , respectively. The difference between the ROU assets and lease liabilities was recorded primarily as adjustments to other assets and liabilities where prepaid rent and deferred expenses were previously recorded. Additionally, the Company's accounting for finance leases remained consistent. The changes did not have an impact on the Company’s Condensed Consolidated Statements of Operations or Condensed Consolidated Statements of Cash Flows. The discount rates used to calculate the ROU assets and lease liabilities as of the effective date were based on the remaining lease terms as of the effective date. See Note 6, Leases, for additional information. On January 1, 2019, the Company adopted changes issued by the FASB 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. Upon adoption, the Company’s recognition model for the excluded component was modified from a mark-to-market approach to an amortization approach for hedging relationships. Hedging relationships entered into on or after January 1, 2019 will be under the amortization approach while those entered into before January 1, 2019 will continue to be recognized under the mark-to-market approach. As such, there was no effect of applying this election reflected as an adjustment to Accumulated other comprehensive loss with a corresponding adjustment to the opening balance of Retained earnings. Presentation and disclosure amendments are required to be applied prospectively. Other than required expanded disclosures, the adoption of these changes did not have a material impact on the Company's condensed consolidated financial statements. On January 1, 2019, the Company adopted changes issued by the FASB which allow entities to reclassify stranded income tax effects resulting from the Tax Cuts and Jobs Act (the “Tax Act”) from accumulated other comprehensive income to retained earnings in the consolidated financial statements. Under the Tax 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 adoption of these changes resulted in the Company reclassifying approximately $21 million of stranded income tax effects into Retained earnings. The following accounting standards have been issued and become effective for the Company at a future date: In June 2016, the FASB issued changes, as amended, which update the impairment model by requiring entities to use a forward-looking approach based on expected losses rather than incurred losses to estimate credit losses on certain types of financial instruments, including trade receivables. This may result in the earlier recognition of allowances for losses. The changes become effective for the Company on January 1, 2020, with early adoption permitted. Management has not yet completed the assessment of the impact of the new standard on the Company’s condensed consolidated financial statements. 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 2018, the FASB issued changes which modify the disclosure requirements for fair value measurements. The amendments in this update remove the requirement to disclose the amount of, and reasons for, transfers between Level 1 and Level 2 of the fair value hierarchy; the policy for timing of transfers between levels; and the valuation processes for Level 3 fair value measurements. The changes require disclosure of changes in unrealized gains and losses for the period included in other comprehensive income (loss) for recurring Level 3 fair value measurements held at the end of the reporting period and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The changes become effective for the Company on January 1, 2020. Other than required expanded disclosures, the adoption of these changes will not have a material impact on the Company's condensed consolidated financial statements. In August 2018, the FASB issued changes which modify the disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans. The changes remove the requirements to disclose: amounts in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year; the amount and timing of plan assets expected to be returned to the employer; and the effects of a one-percentage point change in assumed health care cost trend rates. The update also requires disclosure of an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. The changes become effective for the Company on January 1, 2021. Management does not believe these changes will have a material impact on its condensed consolidated financial statements.

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables)	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Summary of assets acquired and liabilities assumed	The fair value recorded for the assets acquired and liabilities assumed for Clean Earth is as follows: (In millions) Preliminary Valuation June 28, 2019 Cash and cash equivalents (a) $ 42.8 Trade accounts receivable, net 63.7 Other receivables 0.8 Other current assets 8.7 Property, plant and equipment 75.6 Right-of-use assets 14.4 Goodwill 313.8 Intangible assets 261.1 Other assets 4.0 Accounts payable (23.0 ) Acquisition consideration payable (a) (39.2 ) Other current liabilities (20.5 ) Net deferred taxes liabilities (51.2 ) Operating lease liabilities (11.1 ) Other liabilities (b) (11.9 ) Total identifiable net assets of Clean Earth $ 628.0 (a) Acquisition consideration payable represents a portion of the cash consideration not paid out until July 2019. (b) Includes $2.8 million of fair value related to a contingent consideration liability resulting from a prior Clean Earth acquisition. The fair value recorded for the assets acquired and liabilities assumed for Altek is as follows: Final Valuation (In millions) June 30 2018 Measurement Period Adjustments (b) March 31 2019 Cash and cash equivalents $ 1.7 $ — $ 1.7 Net working capital (1.5 ) 0.2 (1.3 ) Property, plant and equipment 3.3 — 3.3 Intangible assets 52.5 0.2 52.7 Goodwill 20.9 1.6 22.5 Net deferred tax liabilities (8.5 ) — (8.5 ) Other liabilities (0.3 ) — (0.3 ) Total identifiable net assets of Altek $ 68.1 $ 2.0 $ 70.1 (b) The measurement period adjustments did not have a material impact on the Company's previously reported operating results.
Preliminary valuation of identifiable intangible assets and amortization periods	The following table details the preliminary valuation of identifiable intangible assets and amortization periods for Clean Earth: (Dollars in millions) Weighted-Average Amortization Period Preliminary Valuation June 28, 2019 Permits and rights 18 years $ 176.1 Customer relationships 6 years 33.4 Air rights Usage based 25.6 Trade names 11.5 years 26.0 Total identifiable intangible assets of Clean Earth $ 261.1
Pro forma information	The pro forma information below gives effect to the Clean Earth acquisition as if it had been completed on January 1, 2018 (the “pro forma period”). The pro forma information is not necessarily indicative of the Company’s results of operations had the acquisition been completed on the above date, nor is it necessarily indicative of future results. The pro forma information does not reflect any cost savings from operating efficiencies or synergies that could result from the acquisition and does not reflect the additional revenue opportunities following the acquisition. The pro forma information below includes adjustments to reflect additional depreciation and amortization expense based on the estimated fair value and useful lives of intangible assets and fixed assets acquired; includes additional interest expense of approximately $9.2 million and $18.2 million for the three and six months ended June 30, 2019, respectively and $9.0 million and $17.9 million for the three and six months ended June 30, 2018, respectively, on the acquisition related borrowings used to finance the Clean Earth acquisition; and excludes certain directly attributable transaction costs and historic Clean Earth interest expense. These pro forma adjustments are subject to change as additional analysis is performed. The values assigned to the assets acquired and liabilities assumed are based on preliminary valuations and are subject to change as the Company obtains additional information during the measurement period. Three Months Ended Six Months Ended June 30 June 30 (In millions) 2019 2018 2019 2018 Pro forma revenues $ 420.0 $ 410.1 $ 813.5 $ 792.8 Pro forma net income (including discontinued operations) 24.8 37.8 39.1 43.0
Summary of changes in fair value of contingent consideration	The following table reflects the changes in the fair value of contingent consideration: (In thousands) Contingent Consideration Balance at December 31, 2018 $ 8,420 Fair value adjustment (c) (3,511 ) Foreign currency translation (68 ) Balance at June 30, 2019 $ 4,841 (c) The fair value adjustment resulted from the decreased probability of Altek achieving cumulative financial and non-financial performance goals within the required time frame. This amount is recorded in Other expenses, net on the Company's Condensed Consolidated Statements of Operations.
Balance sheet positions and financial information included in net income from discontinued operations and statements of cash flows	The former Harsco Industrial Segment's balance sheet positions as of June 30, 2019 and December 31, 2018 are presented as Assets held-for-sale and Liabilities of assets held-for-sale in the Company’s Condensed Consolidated Balance Sheets and are summarized as follows: (in thousands) June 30 December 31 Trade accounts receivable, net $ 53,789 $ 44,786 Other receivables 333 412 Inventories 20,407 16,926 Current portion of contract assets 15,352 12,124 Other current assets 1,558 984 Property, plant and equipment, net 39,337 37,107 Right-of-use assets, net 17,822 — Goodwill 6,839 6,839 Intangible assets, net 10,058 10,618 Deferred income tax assets 498 563 Other assets 189 204 Total assets $ 166,182 $ 130,563 Accounts payable $ 21,415 $ 24,426 Accrued compensation 4,988 7,385 Current portion of advances on contracts 2,792 1,910 Current portion of operating lease liabilities 2,872 — Other current liabilities 6,010 5,689 Operating lease liabilities 15,180 — Other liabilities 369 555 Total liabilities $ 53,626 $ 39,965 The following is selected financial information included on the Company's Condensed Consolidated Statements of Cash Flows attributable to the former Harsco Industrial Segment: Six Months Ended June 30 (In millions) 2019 2018 Non-cash operating items Depreciation and amortization $ 3,301 $ 3,737 Cash flows from investing activities Purchases of property, plant and equipment 5,221 4,003 Three Months Ended Six Months Ended June 30 June 30 (In millions) 2019 2018 2019 2018 Amounts directly attributable to the former Harsco Industrial Segment: Total revenues $ 116,796 $ 92,065 $ 234,182 $ 175,663 Cost of products sold 85,319 66,640 173,014 127,365 Income before income taxes 9,882 11,251 24,074 21,075 Additional amounts allocated to the former Harsco Industrial Segment: Selling, general and administrative expenses (d) $ 3,527 $ — $ 3,527 $ — Interest expense (e) 7,005 4,295 11,237 8,257 (d) The Company has allocated directly attributable transaction costs to discontinued operations.

Accounts Receivable and Inven_2

Accounts Receivable and Inventories (Tables)	6 Months Ended
	Jun. 30, 2019
Accounts Receivable And Inventories
Schedule of accounts receivable	Accounts receivable consist of the following: (In thousands) June 30 December 31 Trade accounts receivable $ 344,268 $ 251,013 Less: Allowance for doubtful accounts (10,911 ) (4,586 ) Trade accounts receivable, net $ 333,357 $ 246,427 Other receivables (a) $ 53,019 $ 53,770 (a)
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) 2019 2018 2019 2018 Provision (benefit) for doubtful accounts related to trade accounts receivable (b) $ 5,433 $ (125 ) $ 5,423 $ (208 ) (b) The increase in the provision for doubtful accounts primarily resulted from a $5.4 million provision for doubtful accounts in the Harsco Environmental Segment related to a customer in the U.K. entering administration during the second quarter of 2019. The Company continues to provide services to the customer and continues to collect on post-administration invoices timely while the customer seeks a buyer for their operations. Depending on the outcome of any potential transactions, there could be an impact on the Company's results of operations, cash flows and asset valuations in the future, which may be material in any one period.
Schedule of inventories	Inventories consist of the following: (In thousands) June 30 December 31 Finished goods $ 12,731 $ 11,892 Work-in-process 14,447 20,839 Raw materials and purchased parts 80,432 61,547 Stores and supplies 26,280 21,907 Total inventories $ 133,890 $ 116,185

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 30, 2019
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 $ 30,427 $ 10,143 Land improvements 18,713 15,961 Buildings and improvements 180,640 163,037 Machinery and equipment 1,558,713 1,470,620 Uncompleted construction 61,750 36,968 Gross property, plant and equipment 1,850,243 1,696,729 Less: Accumulated depreciation (1,299,572 ) (1,263,936 ) Property, plant and equipment, net $ 550,671 $ 432,793

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Components of Lease Expense and Supplemental Cash Flow and Additional Information	The components of lease expense were as follows: Three Months Ended Six Months Ended (In thousands) June 30 June 30 Finance leases: Amortization expense $ 312 $ 586 Interest on lease liabilities 37 41 Operating leases 3,435 7,127 Short-term leases 4,818 9,388 Variable lease expense — 221 Total lease expense from continuing operations $ 8,602 $ 17,363 Supplemental cash flow information related to leases was as follows: Six Months Ended (In thousands) June 30 Cash paid for amounts included in the measurement of lease liabilities: Cash flows from operating activities - Operating leases $ 6,743 Cash flows from financing activities - Finance leases 637 Right-of-use assets obtained in exchange for lease obligations: Operating leases (a) $ 50,696 Finance leases 1,692 (a) Includes ROU assets of approximately $34 million that were recorded upon adoption at January 1, 2019 and $14.4 million that were recorded upon the acquisition of Clean Earth. See Note 2, Recently Adopted and Recently Issued Accounting Standards, and Note 3, Acquisitions and Dispositions, for additional information. Supplemental additional information related to leases is as follows: June 30 Other information: Weighted average remaining lease term - Operating leases (in years) 5.00 Weighted average remaining lease term - Finance leases (in years) 3.03 Weighted average discount rate - Operating leases 6.1 % Weighted average discount rate - Finance leases 4.3 %
Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows: (In thousands) June 30 Operating Leases: Operating lease right-of-use assets $ 44,145 Other current liabilities 12,960 Operating lease liabilities 31,440 Finance Leases: Property, plant and equipment, net $ 2,356 Current maturities of long-term debt 1,216 Long-term debt 1,171
Maturities of Operating Lease Liabilities	Maturities of lease liabilities were as follows: (In thousand) Operating Leases Finance Leases Year Ending December 31 st : 2019 (excluding the six months ended June 30, 2019) $ 8,391 $ 626 2020 13,387 913 2021 9,838 667 2022 5,999 216 2023 4,320 100 After 2023 13,634 26 Total lease payments 55,569 2,548 Less imputed interest (11,169 ) (161 ) Total $ 44,400 $ 2,387
Maturities of Finance Lease Liabilities	Maturities of lease liabilities were as follows: (In thousand) Operating Leases Finance Leases Year Ending December 31 st : 2019 (excluding the six months ended June 30, 2019) $ 8,391 $ 626 2020 13,387 913 2021 9,838 667 2022 5,999 216 2023 4,320 100 After 2023 13,634 26 Total lease payments 55,569 2,548 Less imputed interest (11,169 ) (161 ) Total $ 44,400 $ 2,387
Future Minimum Payments Under Operating Leases with Noncancelable Terms	As previously disclosed, under then in effect lease accounting in accordance with U.S. GAAP, future minimum payments under operating leases with noncancelable terms were as follows as of December 31, 2018: (In thousands) (b) 2019 $ 10,761 2020 8,938 2021 6,235 2022 4,602 2023 3,083 After 2023 17,170 (b) These amounts do not include operating lease obligations of Clean Earth as of December 31, 2018.

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 : (In thousands) Harsco Environmental Segment Harsco Clean Earth Segment Harsco Rail Segment Consolidated Totals Balance at December 31, 2018 $ 391,687 $ — $ 13,026 $ 404,713 Changes to goodwill (a) — 313,806 — 313,806 Foreign currency translation (792 ) — — (792 ) Balance at June 30, 2019 $ 390,895 $ 313,806 $ 13,026 $ 717,727 (a) The changes to goodwill related to the acquisition of Clean Earth. See Note 3, Acquisitions and Dispositions, for additional information.
Schedule of intangible assets by class	Intangible assets, net on the Company's Condensed Consolidated Balance Sheets consist of the following: June 30, 2019 December 31, 2018 (In thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Customer related $ 154,835 $ 94,593 $ 122,379 $ 93,580 Permits 176,121 — — — Technology related 34,920 3,690 35,831 2,681 Trade names 31,542 858 5,565 681 Air rights 25,584 — — Patents 262 171 2,598 2,503 Other 3,817 1,081 4,215 1,936 Total $ 427,081 $ 100,393 $ 170,588 $ 101,381
Schedule of amortization expense	Amortization expense for intangible assets was as follows: Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Amortization expense for intangible assets $ 1,901 $ 1,197 $ 3,840 $ 2,027
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) 2019 2020 2021 2022 2023 Estimated amortization expense (b) $ 18,700 $ 29,500 $ 26,250 $ 23,000 $ 23,000

Debt and Credit Agreements (Tab

Debt and Credit Agreements (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Schedule of long-term debt	Long-term debt consists of the following: (In thousands) June 30 2019 December 31 Senior Secured Credit Facilities: Term Loan Facility $ 539,065 $ 541,788 Revolving Credit Facility 302,000 62,000 5.75% Notes, due 2027 500,000 — Other financing payable (including finance leases) in varying amounts due principally through 2019 2,773 1,606 Total debt obligations 1,343,838 605,394 Less: deferred financing costs (23,155 ) (13,243 ) Total debt obligations, net of deferred financing costs 1,320,683 592,151 Less: current maturities of long-term debt (6,840 ) (6,489 ) Long-term debt $ 1,313,843 $ 585,662

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Schedule of net benefit costs	Three Months Ended June 30 Defined Benefit Pension Plans Net Periodic Pension Cost (Benefit) U.S. Plans International Plans (In thousands) 2019 2018 2019 2018 Service costs $ 10 $ 11 $ 357 $ 408 Interest costs 2,651 2,390 5,548 5,442 Expected return on plan assets (2,593 ) (3,017 ) (9,319 ) (10,696 ) Recognized prior service costs — — 65 (37 ) Recognized loss 1,405 1,302 3,577 3,690 Settlement/curtailment losses 129 — — — Defined benefit pension plans net periodic pension cost (benefit) $ 1,602 $ 686 $ 228 $ (1,193 ) Six Months Ended Jun 30 Defined Benefit Pension Plans Net Periodic Pension Cost (Benefit) U.S. Plans International Plans (In thousands) 2019 2018 2019 2018 Service costs $ 20 $ 21 $ 713 $ 794 Interest costs 5,302 4,781 11,212 11,114 Expected return on plan assets (5,186 ) (6,034 ) (18,836 ) (21,841 ) Recognized prior service costs — — 131 (76 ) Recognized loss 2,810 2,604 7,230 7,530 Settlement/curtailment losses 129 166 — — Defined benefit pension plans net periodic pension cost (benefit) $ 3,075 $ 1,538 $ 450 $ (2,479 )
Schedule of contributions to pension plans	Three Months Ended Six Months Ended Company Contributions June 30 June 30 (In thousands) 2019 2018 2019 2018 Defined benefit pension plans (U.S.) $ 2,011 $ 2,067 $ 3,490 $ 3,351 Defined benefit pension plans (International) 3,131 3,239 12,401 12,973 Multiemployer pension plans 483 519 1,004 1,020 Defined contribution pension plans 2,969 2,747 6,359 5,582

Reconciliation of Basic and D_2

Reconciliation of Basic and Diluted Shares (Tables)	6 Months Ended
	Jun. 30, 2019
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) 2019 2018 2019 2018 Income (loss) from continuing operations attributable to Harsco Corporation common stockholders $ (2,852 ) $ 31,110 $ 7,622 $ 41,613 Weighted-average shares outstanding: Weighted-average shares outstanding - basic 80,328 80,861 80,119 80,756 Dilutive effect of stock-based compensation — 2,782 1,955 2,838 Weighted-average shares outstanding - diluted 80,328 83,643 82,074 83,594 Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders: Basic $ (0.04 ) $ 0.38 $ 0.10 $ 0.52 Diluted $ (0.04 ) $ 0.37 $ 0.09 $ 0.50
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) 2019 2018 2019 2018 Restricted stock units 443 — — — Stock appreciation rights 1,919 283 389 489 Performance share units 685 — 116 —

Derivative Instruments, Hedgi_2

Derivative Instruments, Hedging Activities and Fair Value (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of fair value of outstanding derivative contracts	The fair value of outstanding derivative contracts recorded as assets and liabilities on the Company's Condensed Consolidated Balance Sheets was as follows: (In thousands) Balance Sheet Location Fair Value of Derivatives Designated as Hedging Instruments Fair Value of Derivatives Not Designated as Hedging Instruments Total Fair Value June 30, 2019 Asset derivatives (Level 2): Foreign currency exchange forward contracts Other current assets $ 2,855 $ 4,261 $ 7,116 Total $ 2,855 $ 4,261 $ 7,116 Liability derivatives (Level 2): Foreign currency exchange forward contracts Other current liabilities $ 36 $ 797 $ 833 Interest rate swaps Other current liabilities 1,227 — 1,227 Interest rate swaps Other liabilities 4,631 — 4,631 Total $ 5,894 $ 797 $ 6,691 December 31, 2018 Asset derivatives (Level 2): Foreign currency exchange forward contracts Other current assets $ 2,970 $ 589 $ 3,559 Interest rate swaps Other current assets 1,331 — 1,331 Interest rate swaps Other assets 128 — $ 128 Total $ 4,429 $ 589 $ 5,018 Liability derivatives (Level 2): Foreign currency exchange forward contracts Other current liabilities $ 24 $ 2,910 $ 2,934 Interest rate swaps Other liabilities 1,849 — 1,849 Total $ 1,873 $ 2,910 $ 4,783
Schedule of effect of derivative instruments	Derivatives Designated as Hedging Instruments Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives Location of Amount Reclassified from Accumulated OCI into Income Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity Three Months Ended Three Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Foreign currency exchange forward contracts $ 669 $ 1,539 Product revenues/Cost of services sold $ (389 ) $ 103 Interest rate swaps — — Income from discontinued businesses 2,741 — Interest rate swaps (4,327 ) 2,071 Interest expense (271 ) (235 ) Cross-currency interest rate swaps (a) 54 93 Interest expense 303 377 $ (3,604 ) $ 3,703 $ 2,384 $ 245 Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives Location of Amount Reclassified from Accumulated OCI into Income Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity Six Months Ended Six Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Foreign currency exchange forward contracts $ (43 ) $ 1,779 Product revenues/Cost of services sold $ (421 ) $ (109 ) Foreign currency exchange forward contracts (b) — — Retained earnings — (1,520 ) Interest rate swaps — — Income from discontinued businesses 2,741 — Interest rate swaps (7,636 ) 5,381 Interest expense (572 ) (235 ) Cross-currency interest rate swaps (a) 2 — Interest expense 617 648 $ (7,677 ) $ 7,160 $ 2,365 $ (1,216 ) (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. The location and amount of gain (loss) recognized on the Company's Condensed Consolidated Statements of Operations: Three Months Ended June 30 2019 2018 (in thousands) Product Revenues Cost of Services Sold Interest Expense Income From Discontinued Businesses Product Revenues Cost of Services Sold Interest Expense Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded $ 112,895 $ 186,840 $ (6,103 ) $ 9,936 $ 94,199 $ 187,393 $ (5,681 ) Interest rate swaps: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income — — 271 — — — 235 Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring — — — (2,741 ) — — — Foreign exchange contracts: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 433 (44 ) — — (103 ) — — Amount excluded from effectiveness testing recognized in earnings based on changes in fair value 238 — — — — 12 — Cross-currency interest rate swaps: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income — — (303 ) — — — (377 ) Six Months Ended June 30 2019 2018 (in thousands) Product Revenues Cost of Services Sold Interest Expense Income From Discontinued Businesses Product Revenues Cost of Services Sold Interest Expense Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded $ 213,277 $ 368,711 $ (11,610 ) $ 23,686 $ 174,429 $ 379,068 $ (11,271 ) Interest rate swaps: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income — — 572 — — — 235 Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring — — — (2,741 ) — — — Foreign exchange contracts: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 465 (44 ) — — 109 — — Amount excluded from effectiveness testing recognized in earnings based on changes in fair value 316 — — — — (7 ) — Cross-currency interest rate swaps: Amount of gain or (loss) reclassified from accumulated other comprehensive income into income — — (617 ) — — — (648 ) Derivatives Not Designated as Hedging Instruments Location of Gain Recognized in Income on Derivatives Amount of Gain Recognized in Income on Derivatives (c) Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Foreign currency exchange forward contracts Cost of services and products sold $ 2,770 $ 15,731 $ 5,094 $ 10,265 (c) These gains offset amounts recognized in cost of services and products sold principally as a result of intercompany or third party foreign currency exposures.

Review of Operations by Segme_2

Review of Operations by Segment (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Schedule of operations by segment	Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Revenues From Continuing Operations (a) Harsco Environmental $ 269,338 $ 272,320 $ 530,650 $ 537,043 Harsco Clean Earth — — — — Harsco Rail 81,560 67,552 150,150 127,230 Corporate — 35 — 74 Total Revenues From Continuing Operations $ 350,898 $ 339,907 $ 680,800 $ 664,347 Operating Income (Loss) From Continuing Operations (a) Harsco Environmental $ 27,577 $ 35,661 $ 52,074 $ 63,396 Harsco Clean Earth — — — — Harsco Rail 9,443 8,618 14,832 10,570 Corporate (19,221 ) (6,215 ) (29,283 ) (13,174 ) Total Operating Income From Continuing Operations $ 17,799 $ 38,064 $ 37,623 $ 60,792 Depreciation and Amortization (a) Harsco Environmental $ 28,497 $ 28,632 $ 57,202 $ 57,717 Harsco Clean Earth — — — — Harsco Rail 1,209 1,039 2,376 2,103 Corporate 1,417 1,665 2,769 3,014 Total Depreciation and Amortization $ 31,123 $ 31,336 $ 62,347 $ 62,834 Capital Expenditures (a) Harsco Environmental $ 45,095 $ 24,423 $ 74,258 $ 49,599 Harsco Clean Earth — — — — Harsco Rail 6,365 2,088 10,281 2,518 Corporate 287 172 1,440 376 Total Capital Expenditures $ 51,747 $ 26,683 $ 85,979 $ 52,493 (a) The Company's acquisition of Clean Earth closed on June 28, 2019. Revenues and operating income for the three and six months ended June 30, 2019 for the Harsco Clean Earth Segment are immaterial. The operating results of the former Harsco Industrial Segment has been reflected as discontinued operations in the Company's Condensed Consolidated Statement of Operations for all periods presented. See Note 3, Acquisitions and Dispositions, for additional details.
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 and Equity Income Three Months Ended Six Months Ended June 30 June 30 (In thousands) 2019 2018 2019 2018 Segment operating income $ 37,020 $ 44,279 $ 66,906 $ 73,966 General Corporate expense (19,221 ) (6,215 ) (29,283 ) (13,174 ) Operating income from continuing operations 17,799 38,064 37,623 60,792 Interest income 591 577 1,124 1,070 Interest expense (6,103 ) (5,681 ) (11,610 ) (11,271 ) Unused debt commitment and amendment fees (7,435 ) — (7,435 ) — Loss on early extinguishment of debt — (1,034 ) — (1,034 ) Defined benefit pension income (expense) (1,472 ) 904 (2,810 ) 1,743 Income from continuing operations before income taxes and equity income $ 3,380 $ 32,830 $ 16,892 $ 51,300

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 (In thousands) Harsco Environmental Segment Harsco Clean Earth Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) (b) : North America $ 78,112 $ — $ 65,278 $ — $ 143,390 Western Europe 98,478 — 10,538 — 109,016 Latin America (c) 36,272 — 773 — 37,045 Asia-Pacific 35,779 — 4,971 — 40,750 Middle East and Africa 15,742 — — — 15,742 Eastern Europe 4,955 — — — 4,955 Total Revenues $ 269,338 $ — $ 81,560 $ — $ 350,898 Key Product and Service Groups (a) : On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems $ 269,338 $ — $ — $ — $ 269,338 Environmental solutions for contaminated materials, hazardous waste and dredged materials — — — — — Railway track maintenance services and equipment — — 81,560 — 81,560 Total Revenues $ 269,338 $ — $ 81,560 $ — $ 350,898 Three Months Ended June 30, 2018 (In thousands) Harsco Environmental Segment Harsco Clean Earth Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) (b) : North America $ 79,862 $ — $ 47,547 $ 35 $ 127,444 Western Europe 97,410 — 13,041 — 110,451 Latin America (c) 37,388 — 1,331 — 38,719 Asia-Pacific 37,788 — 5,633 — 43,421 Middle East and Africa 12,150 — — — 12,150 Eastern Europe 7,722 — — — 7,722 Total Revenues $ 272,320 $ — $ 67,552 $ 35 $ 339,907 Key Product and Service Groups (a) : On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems $ 272,320 $ — $ — $ — $ 272,320 Environmental solutions for contaminated materials, hazardous waste and dredged materials — — — — — Railway track maintenance services and equipment — — 67,552 — 67,552 General Corporate — — — 35 35 Total Revenues $ 272,320 $ — $ 67,552 $ 35 $ 339,907 Six Months Ended June 30, 2019 (In thousands) Harsco Environmental Segment Harsco Clean Earth Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) (b) : North America $ 151,461 $ — $ 115,643 $ — $ 267,104 Western Europe 196,699 — 20,551 — 217,250 Latin America (c) 73,263 — 1,364 — 74,627 Asia-Pacific 69,917 — 12,592 — 82,509 Middle East and Africa 29,657 — — — 29,657 Eastern Europe 9,653 — — — 9,653 Total Revenues $ 530,650 $ — $ 150,150 $ — $ 680,800 Key Product and Service Groups (a) : 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 $ 530,650 $ — $ — $ — $ 530,650 Environmental solutions for contaminated materials, hazardous waste and dredged materials — — — — — Railway track maintenance services and equipment — — 150,150 — 150,150 Total Revenues $ 530,650 $ — $ 150,150 $ — $ 680,800 Six Months Ended June 30, 2018 (In thousands) Harsco Environmental Segment Harsco Clean Earth Segment Harsco Rail Segment Corporate Consolidated Totals Primary Geographical Markets (a) (b) : North America $ 150,927 $ — $ 87,952 $ 74 $ 238,953 Western Europe 194,331 — 27,761 — 222,092 Latin America (c) 78,846 — 2,164 — 81,010 Asia-Pacific 74,009 — 9,353 — 83,362 Middle East and Africa 23,703 — — — 23,703 Eastern Europe 15,227 — — — 15,227 Total Revenues $ 537,043 $ — $ 127,230 $ 74 $ 664,347 Key Product and Service Groups (a) : 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 Environmental solutions for contaminated materials, hazardous waste and dredged materials — — — — — Railway track maintenance services and equipment — — 127,230 — 127,230 General Corporate — — — 74 74 Total Revenues $ 537,043 $ — $ 127,230 $ 74 $ 664,347 (a) The Company's acquisition of Clean Earth closed on June 28, 2019. Revenues and operating income for the three and six months ended June 30, 2019 for the Harsco Clean Earth Segment are immaterial. The operating results of the former Harsco Industrial Segment have been reflected as discontinued operations in the Company's Condensed Consolidated Statement of Operations for all periods presented. See Note 3, Acquisitions and Dispositions, for additional details. (b) Revenues are attributed to individual countries based on the location of the facility generating the revenue. (c) Includes Mexico.

Other (Income) Expenses, Net (T

Other (Income) Expenses, Net (Tables)	6 Months Ended
	Jun. 30, 2019
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) 2019 2018 2019 2018 Employee termination benefit costs $ 997 $ 769 $ 3,516 $ 2,174 Other costs to exit activities 1,192 (25 ) 2,347 227 Impaired asset write-downs — 104 214 104 Contingent consideration adjustments (3,880 ) — (3,511 ) — Net gains — (1,097 ) (2,271 ) (1,097 ) Other (26 ) (765 ) (269 ) (758 ) Other (income) expenses, net $ (1,717 ) $ (1,014 ) $ 26 $ 650

Components of Accumulated Oth_2

Components of Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Schedule of accumulated other comprehensive loss	The components of Accumulated other comprehensive loss, net of the effect of income taxes, and activity for the six months ended June 30, 2018 and 2019 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, 2017 $ (111,567 ) $ 808 $ (435,840 ) $ 17 $ (546,582 ) Adoption of new accounting standard (a) — (1,520 ) — — (1,520 ) Other comprehensive income (loss) before reclassifications (36,205 ) (b) 5,482 (c) 10,015 (b) (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 ) 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, 2018 $ (159,810 ) $ 1,389 $ (408,655 ) $ (31 ) $ (567,107 ) Adoption of new accounting standard (d) — — (21,429 ) — (21,429 ) Other comprehensive income (loss) before reclassifications 2,775 (b) (5,893 ) (c) 2,192 (b) 25 (901 ) Amounts reclassified from accumulated other comprehensive loss, net of tax (2,271 ) 1,722 9,579 — 9,030 Total other comprehensive income (loss) 504 (4,171 ) 11,771 25 8,129 Other comprehensive income attributable to noncontrolling interests 178 — — — 178 Other comprehensive income (loss) attributable to Harsco Corporation 682 (4,171 ) 11,771 25 8,307 Balance at June 30, 2019 $ (159,128 ) $ (2,782 ) $ (418,313 ) $ (6 ) $ (580,229 ) (a) 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. (b) Principally foreign currency fluctuation. (c) Net change from periodic revaluations. (d)
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 on the Company's Condensed Consolidated Statements of Operations June 30 June 30 June 30 June 30 Recognition of cumulative foreign currency translation adjustments: Gain on substantial liquidation of subsidiary (e) $ — $ — $ (2,271 ) $ — Other (income) expenses, net Amortization of cash flow hedging instruments: Foreign currency exchange forward contracts $ (433 ) $ 103 $ (465 ) $ (109 ) Product revenues Foreign currency exchange forward contracts 44 — 44 — Cost of services sold Cross-currency interest rate swaps 303 377 617 648 Interest expense Interest rate swaps (271 ) (235 ) (572 ) (235 ) Interest expense Interest rate swaps 2,741 — 2,741 — Income from discontinued businesses Total before tax 2,384 245 2,365 304 Tax expense (599 ) (57 ) (643 ) (207 ) Total reclassification of cash flow hedging instruments, net of tax $ 1,785 $ 188 $ 1,722 $ 97 Amortization of defined benefit pension items (f) : Recognized losses $ 4,982 $ 4,992 $ 10,040 $ 10,134 Defined benefit pension income (expense) Recognized prior-service costs 65 (37 ) 131 (76 ) Defined benefit pension income (expense) Settlement/curtailment losses 129 — 129 166 Defined benefit pension income (expense) Total before tax 5,176 4,955 10,300 10,224 Tax benefit (379 ) (288 ) (721 ) (613 ) Total reclassification of defined benefit pension items, net of tax $ 4,797 $ 4,667 $ 9,579 $ 9,611 (e) No tax impact. (f) These accumulated other comprehensive loss components are included in the computation of net periodic pension costs. See Note 9, Employee Benefit Plans, for additional details.

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Millions	Jun. 28, 2019	Jul. 01, 2019
AXC | Subsequent Event | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Selling price		$ 592
Harsco Clean Earth Segment
Business Acquisition [Line Items]
Cash consideration	$ 628

Recently Adopted and Recently_2

Recently Adopted and Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets, net	$ 44,145			$ 0
Lease liabilities	$ 44,400
Stranded income tax effects in accumulated other comprehensive income		$ 21,000
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets, net			$ 34,000
Lease liabilities			$ 34,200

Acquisitions and Dispositions -

Acquisitions and Dispositions - Acquisitions Narrative (Details) $ in Thousands, £ in Millions	Jun. 28, 2019USD ($)facility	Jun. 28, 2019USD ($)facility	Jun. 28, 2019USD ($)facilityTSDF_permits	Jun. 28, 2019USD ($)facilityRCRA_permits	May 31, 2018GBP (£)	May 31, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2019USD ($)	May 31, 2018USD ($)
Business Acquisition [Line Items]
Total revenues							$ 350,898	$ 339,907	$ 680,800	$ 664,347
Additional interest expense							6,103	5,681	11,610	11,271
Purchase price									584,485	56,389
Harsco Clean Earth Segment
Business Acquisition [Line Items]
Percentage of interests acquired	100.00%	100.00%	100.00%	100.00%
Enterprise valuation		$ 625,000
Cash consideration		628,000
Post-closing period	5 years
Estimated reimbursements	$ 8,000	$ 8,000	$ 8,000	$ 8,000
Number of permitted facilities | facility	27	27	27	27
Number Of Permits Acquired			6	9
Goodwill to be deductible for income tax purposes	$ 16,300	$ 16,300	$ 16,300	$ 16,300
Direct acquisition costs							12,000		12,500
Harsco Clean Earth Segment | Acquisition-related Borrowings
Business Acquisition [Line Items]
Additional interest expense							$ 9,200	$ 9,000	$ 18,200	$ 17,900
Harsco Clean Earth Segment | Scenario, Forecast
Business Acquisition [Line Items]
Total revenues											$ 300,000
Altek
Business Acquisition [Line Items]
Cash consideration						$ 57,400
Estimated reimbursements												$ 12,100
Purchase price					£ 45	$ 60,000
Additional contingent consideration					£ 25							$ 33,000

Acquisitions and Dispositions_2

Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Jun. 28, 2019	Dec. 31, 2018	Jun. 30, 2018
Business Acquisition [Line Items]
Goodwill		$ 717,727		$ 404,713
Harsco Clean Earth Segment
Business Acquisition [Line Items]
Cash and cash equivalents			$ 42,800
Trade accounts receivable, net			63,700
Other receivables			800
Other current assets			8,700
Property, plant and equipment			75,600
Right-of-use assets			14,400
Goodwill			313,800
Intangible assets			261,100
Other assets			4,000
Accounts payable			(23,000)
Acquisition consideration payable			(39,200)
Other current liabilities			(20,500)
Net deferred taxes liabilities			(51,200)
Operating lease liabilities			(11,100)
Other liabilities			(11,900)
Total identifiable net assets of Altek			628,000
Acquisition consideration payable			$ (2,800)
Altek
Business Acquisition [Line Items]
Cash and cash equivalents	$ 1,700				$ 1,700
Net working capital	(1,300)				(1,500)
Property, plant and equipment	3,300				3,300
Goodwill	22,500				20,900
Intangible assets	52,700				52,500
Net deferred taxes liabilities	(8,500)				(8,500)
Other liabilities	(300)				(300)
Total identifiable net assets of Altek	70,100				$ 68,100
Measurement Period Adjustments
Net working capital	200
Intangible assets	200
Goodwill	1,600
Total identifiable net assets of Altek	$ 2,000

Acquisitions and Dispositions_3

Acquisitions and Dispositions - Preliminary Valuation of Identifiable Intangible Assets and Amortization Periods (Details) - Harsco Clean Earth Segment $ in Millions	Jun. 28, 2019USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Preliminary Valuation	$ 261.1
Permits and rights
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Period	18 years
Preliminary Valuation	$ 176.1
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Period	6 years
Preliminary Valuation	$ 33.4
Air rights
Acquired Finite-Lived Intangible Assets [Line Items]
Preliminary Valuation	$ 25.6
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-Average Amortization Period	11 years 6 months
Preliminary Valuation	$ 26

Acquisitions and Dispositions_4

Acquisitions and Dispositions - Pro Forma Information (Details) - Harsco Clean Earth Segment - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Pro forma revenues	$ 420	$ 410.1	$ 813.5	$ 792.8
Pro forma net income (including discontinued operations)	$ 24.8	$ 37.8	$ 39.1	$ 43

Acquisitions and Dispositions_5

Acquisitions and Dispositions - Changes in Fair Value of Contingent Consideration (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Contingent Consideration
Balance at December 31, 2018			$ 8,420
Fair value adjustment	$ (3,880)	$ 0	(3,511)	$ 0
Foreign currency translation			(68)
Balance at June 30, 2019	$ 4,841		$ 4,841

Acquisitions and Dispositions_6

Acquisitions and Dispositions - Dispositions Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jul. 01, 2019
AXC | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Selling price			$ 592
Harsco Industrial | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Corporate overhead expenses	$ 1.4	$ 2.8

Acquisitions and Dispositions_7

Acquisitions and Dispositions - Balance Sheet Positions (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total liabilities	$ 38,077	$ 39,410
Harsco Industrial | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Trade accounts receivable, net	53,789	44,786
Other receivables	333	412
Inventories	20,407	16,926
Current portion of contract assets	15,352	12,124
Other current assets	1,558	984
Property, plant and equipment, net	39,337	37,107
Right-of-use assets, net	17,822
Goodwill	6,839	6,839
Intangible assets, net	10,058	10,618
Deferred income tax assets	498	563
Other assets	189	204
Total assets	166,182	130,563
Accounts payable	21,415	24,426
Accrued compensation	4,988	7,385
Current portion of advances on contracts	2,792	1,910
Current portion of operating lease liabilities	2,872
Other current liabilities	6,010	5,689
Operating lease liabilities	15,180
Other liabilities	369	555
Total liabilities	$ 53,626	$ 39,965

Acquisitions and Dispositions_8

Acquisitions and Dispositions - Financial Information Included in Net Income from Discontinued Operations (Details) - Harsco Industrial - Discontinued Operations, Held-for-sale - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Amounts directly attributable to the former Harsco Industrial Segment:
Total revenues	$ 116,796	$ 92,065	$ 234,182	$ 175,663
Cost of products sold	85,319	66,640	173,014	127,365
Income before income taxes	9,882	11,251	24,074	21,075
Additional amounts allocated to the former Harsco Industrial Segment:
Selling, general and administrative expenses	3,527	0	3,527	0
Interest expense	$ 7,005	$ 4,295	$ 11,237	$ 8,257

Acquisitions and Dispositions_9

Acquisitions and Dispositions - Condensed Consolidated Statements of Cash Flows (Details) - Harsco Industrial - Discontinued Operations, Held-for-sale - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Non-cash operating items
Depreciation and amortization	$ 3,301	$ 3,737
Cash flows from investing activities
Purchases of property, plant and equipment	$ 5,221	$ 4,003

Accounts Receivable and Inven_3

Accounts Receivable and Inventories (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2016
Accounts receivable
Trade accounts receivable	$ 344,268		$ 344,268		$ 251,013
Less: Allowance for doubtful accounts	(10,911)		(10,911)		(4,586)
Trade accounts receivable, net	333,357		333,357		246,427
Other receivables	53,019		53,019		53,770
Provision for doubtful accounts related to trade accounts receivable	5,433	$ (125)	5,423	$ (208)
Inventories
Finished goods	12,731		12,731		11,892
Work-in-process	14,447		14,447		20,839
Raw materials and purchased parts	80,432		80,432		61,547
Stores and supplies	26,280		26,280		21,907
Inventories	133,890		133,890		116,185
Inventory for Contracts
Loss provision that exceeds accumulated contract costs	6,600		6,600
Net customer advances	55,400		55,400		67,100
Contract estimated forward loss provision for Harsco Rail Segment					$ 1,800	$ 45,100
Revenues	350,898	339,907	680,800	664,347
SBB [Member]
Inventory for Contracts
Revenues	$ 5,900	$ 7,500	$ 10,600	$ 15,500
Contract 2 [Member] | SBB [Member]
Inventory for Contracts
Percentage complete	33.00%		33.00%
Harsco Environmental Segment
Accounts receivable
Provision for doubtful accounts related to trade accounts receivable	$ 5,400

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment
Gross property, plant and equipment	$ 1,850,243	$ 1,696,729
Less: Accumulated depreciation	(1,299,572)	(1,263,936)
Property, plant and equipment, net	550,671	432,793
Land
Property, Plant and Equipment
Gross property, plant and equipment	30,427	10,143
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	18,713	15,961
Buildings and improvements
Property, Plant and Equipment
Gross property, plant and equipment	180,640	163,037
Machinery and equipment
Property, Plant and Equipment
Gross property, plant and equipment	1,558,713	1,470,620
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 61,750	$ 36,968

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term - Operating leases (in years)	5 years
Termination period	1 year
Operating lease not yet commenced	$ 1
Minimum
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term - Operating leases (in years)	1 year
Maximum
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term - Operating leases (in years)	24 years 3 months 18 days
Extension period	20 years

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Finance leases:
Amortization expense	$ 312	$ 586
Interest on lease liabilities	37	41
Operating leases	3,435	7,127
Short-term leases	4,818	9,388
Variable lease expense	0	221
Total lease expense from continuing operations	$ 8,602	$ 17,363

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	Jun. 28, 2019	Jan. 01, 2019	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Cash flows from operating activities - Operating leases			$ 6,743
Cash flows from financing activities - Finance leases			637
Right-of-use assets obtained in exchange for lease obligations:
Operating leases		$ 34,000	50,696
Finance leases			$ 1,692
Harsco Clean Earth Segment
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 14,400

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Leases:
Right-of-use assets, net	$ 44,145	$ 0
Other current liabilities	12,960	0
Operating lease liabilities	31,440	$ 0
Finance Leases:
Property, plant and equipment, net	2,356
Current maturities of long-term debt	1,216
Long-term debt	$ 1,171

Leases - Supplemental Additiona

Leases - Supplemental Additional Information (Details)	Jun. 30, 2019
Other information:
Weighted average remaining lease term - Operating leases (in years)	5 years
Weighted average remaining lease term - Finance leases (in years)	3 years 10 days
Weighted average discount rate - Operating leases	6.10%
Weighted average discount rate - Finance leases	4.30%

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019USD ($)
Operating Leases
2019 (excluding the three months ended March 31, 2019)	$ 8,391
2020	13,387
2021	9,838
2022	5,999
2023	4,320
After 2023	13,634
Total lease payments	55,569
Less imputed interest	(11,169)
Total	44,400
Finance Leases
2019 (excluding the three months ended March 31, 2019)	626
2020	913
2021	667
2022	216
2023	100
After 2023	26
Total lease payments	2,548
Less imputed interest	(161)
Total	$ 2,387

Leases - Future Minimum Payment

Leases - Future Minimum Payments Under Operating Leases with Noncancelable Terms (Details) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 10,761
2020	8,938
2021	6,235
2022	4,602
2023	3,083
After 2023	$ 17,170

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Changes in Carrying Amounts of Goodwill by Segment (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Goodwill by segment
Goodwill, Other Increase (Decrease)	$ 313,806
Changes in carrying amounts of goodwill
Balance at December 31, 2018	404,713
Foreign currency translation	(792)
Balance at June 30, 2019	717,727
Harsco Environmental Segment
Goodwill by segment
Goodwill, Other Increase (Decrease)	0
Changes in carrying amounts of goodwill
Balance at December 31, 2018	391,687
Foreign currency translation	(792)
Balance at June 30, 2019	390,895
Harsco Clean Earth Segment
Goodwill by segment
Goodwill, Other Increase (Decrease)	313,806
Changes in carrying amounts of goodwill
Balance at December 31, 2018	0
Foreign currency translation	0
Balance at June 30, 2019	313,806
Harsco Rail Segment
Goodwill by segment
Goodwill, Other Increase (Decrease)	0
Changes in carrying amounts of goodwill
Balance at December 31, 2018	13,026
Foreign currency translation	0
Balance at June 30, 2019	$ 13,026

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Intangible Assets, by category
Gross Carrying Amount	$ 427,081		$ 427,081		$ 170,588
Accumulated Amortization	100,393		100,393		101,381
Amortization expense for intangible assets	1,901	$ 1,197	3,840	$ 2,027
Estimated amortization expense for next 5 years
2019	18,700		18,700
2020	29,500		29,500
2021	26,250		26,250
2022	23,000		23,000
2023	23,000		23,000
Customer related
Intangible Assets, by category
Gross Carrying Amount	154,835		154,835		122,379
Accumulated Amortization	94,593		94,593		93,580
Permits and rights
Intangible Assets, by category
Gross Carrying Amount	176,121		176,121		0
Accumulated Amortization	0		0		0
Patents
Intangible Assets, by category
Gross Carrying Amount	262		262		2,598
Accumulated Amortization	171		171		2,503
Technology related
Intangible Assets, by category
Gross Carrying Amount	34,920		34,920		35,831
Accumulated Amortization	3,690		3,690		2,681
Trade names
Intangible Assets, by category
Gross Carrying Amount	31,542		31,542		5,565
Accumulated Amortization	858		858		681
Air rights
Intangible Assets, by category
Gross Carrying Amount	25,584		25,584		0
Accumulated Amortization	0		0
Other
Intangible Assets, by category
Gross Carrying Amount	3,817		3,817		4,215
Accumulated Amortization	$ 1,081		$ 1,081		$ 1,936

Debt and Credit Agreements - Na

Debt and Credit Agreements - Narrative (Details)	1 Months Ended		3 Months Ended	6 Months Ended
	Jul. 31, 2019USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	May 31, 2019
Debt Instrument [Line Items]
Issuance fees capitalized		$ 11,000,000	$ 11,000,000	$ 11,000,000
Payment of issuance and amendment fees		9,500,000		9,464,000	$ 354,000
Revolving Credit Facility
Debt Instrument [Line Items]
Increase in borrowing capacity		200,000,000
Borrowing capacity		$ 700,000,000	$ 700,000,000	$ 700,000,000
Maximum net debt to consolidated adjusted earnings before interest, tax, depreciation and amortization ratio		4	4	4		3.5
Expenses related to the amendment			$ 700,000
Unsecured Notes | Notes
Debt Instrument [Line Items]
Principal amount		$ 500,000,000	$ 500,000,000	$ 500,000,000
Fixed rate		5.75%	5.75%	5.75%
Term Loan Facility | New Credit Facility
Debt Instrument [Line Items]
Principal amount		$ 550,000,000	$ 550,000,000	$ 550,000,000
Term Loan Facility | New Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Required prepayments	$ 320,900,000
Write off of previously recorded deferred financing costs	$ 5,000,000
Bridge Financing Commitments
Debt Instrument [Line Items]
Payment of issuance and amendment fees			$ 6,700,000

Debt and Credit Agreements - Sc

Debt and Credit Agreements - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total debt obligations	$ 1,343,838	$ 605,394
Less: deferred financing costs	(23,155)	(13,243)
Total debt obligations, net of deferred financing costs	1,320,683	592,151
Less: current maturities of long-term debt	(6,840)	(6,489)
Long-term debt	1,313,843	585,662
Term Loan Facility
Debt Instrument [Line Items]
Total debt obligations	$ 539,065	541,788
Unsecured Notes | 5.75% Notes, due 2027
Debt Instrument [Line Items]
Fixed rate	5.75%
Total debt obligations	$ 500,000	0
Other financing payable (including finance leases) in varying amounts due principally through 2019
Debt Instrument [Line Items]
Total debt obligations	2,773	1,606
Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Total debt obligations	$ 302,000	$ 62,000

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined benefit plans:
Multiemployer pension plans	$ 483	$ 519	$ 1,004	$ 1,020
Defined contribution pension plans	2,969	2,747	6,359	5,582
Pension Plan | U.S. Plans
Defined benefit plans:
Service cost	10	11	20	21
Interest cost	2,651	2,390	5,302	4,781
Expected return on plan assets	(2,593)	(3,017)	(5,186)	(6,034)
Recognized prior service costs	0	0	0	0
Recognized loss	1,405	1,302	2,810	2,604
Settlement/curtailment losses	129	0	129	166
Defined benefit pension plans net periodic pension cost (benefit)	1,602	686	3,075	1,538
Defined benefit pension plan	2,011	2,067	3,490	3,351
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	5,000		5,000
Pension Plan | International Plans
Defined benefit plans:
Service cost	357	408	713	794
Interest cost	5,548	5,442	11,212	11,114
Expected return on plan assets	(9,319)	(10,696)	(18,836)	(21,841)
Recognized prior service costs	65	(37)	131	(76)
Recognized loss	3,577	3,690	7,230	7,530
Settlement/curtailment losses	0	0	0	0
Defined benefit pension plans net periodic pension cost (benefit)	228	(1,193)	450	(2,479)
Defined benefit pension plan	3,131	$ 3,239	12,401	$ 12,973
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 7,800		$ 7,800

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 3,994	$ (502)	$ 5,213	$ 5,696
Income tax benefit arising from the release of adjustments to certain existing deferred tax asset valuation allowances			8,300
Unrecognized income tax benefits including interest and penalties	4,500		4,500
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	$ 100		$ 100

Commitments and Contingencies (

Commitments and Contingencies (Details)	Oct. 19, 2018USD ($)	Jun. 04, 2018USD ($)	Aug. 31, 2005USD ($)	Jun. 30, 2019USD ($)claimdefendant	Jun. 30, 2019BRL (R$)claim	Jun. 13, 2019USD ($)	Dec. 31, 2018USD ($)	Apr. 08, 2016USD ($)
Commitments and Contingencies
Minority interest				35.00%	35.00%
Reserve for loss contingencies				$ 7,000,000
Penalties per day				1,300	R$ 5000
Pennsylvania Department Of Environmental Protection, Processed Slag | Threatened Litigation
Commitments and Contingencies
Loss contingency reserves						$ 400,000
Lima Refinery Litigation
Commitments and Contingencies
Loss contingency damages sought								$ 317,000,000
Netherlands
Commitments and Contingencies
Damages sought - interest, penalties and fees	$ 500,000
Brazilian Tax Disputes - Jan 2004 through May 2005 | Sao Paulo State Revenue Authority
Commitments and Contingencies
Damages sought - interest, penalties and fees				22,000,000
Damages sought - principal				2,000,000
Loss contingency, reduced penalty		$ 2,000,000
Amount of damages sought		$ 9,000,000
Brazilian Tax Disputes - Jan 2002 through Dec 2003 | Sao Paulo State Revenue Authority
Commitments and Contingencies
Damages sought - interest, penalties and fees			$ 5,000,000
Damages sought - principal			1,600,000
Loss contingency, reduced penalty			1,200,000
Amount of damages sought			6,600,000
Loss contingency, reduced penalty, including interest			$ 10,000,000
Brazilian Labor Claims
Commitments and Contingencies
Loss contingency reserves				$ 6,700,000			$ 7,100,000
Other
Commitments and Contingencies
Approximate number of defendants that includes the company named in legal actions | defendant				90
Number of pending claims | claim				17,131	17,131
Number of claims dismissed to date by stipulation or summary judgment prior to trial | claim				28,200
Other | Active or In Extremis docket
Commitments and Contingencies
Number of pending claims | claim				32	32
Other | Minimum
Commitments and Contingencies
Amount of damages sought				$ 20,000,000
Other | Maximum
Commitments and Contingencies
Amount of damages sought				$ 25,000,000
Other | New York County as managed by the New York Supreme Court
Commitments and Contingencies
Number of pending claims | claim				16,582	16,582
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				16,550	16,550
Other | New York State Supreme Court, Counties Excluding New York County
Commitments and Contingencies
Number of pending claims | claim				118	118
Other | Courts Located In States Other Than New York
Commitments and Contingencies
Number of pending claims | claim				431	431
CSN
Commitments and Contingencies
Penalties per day | R$					R$ 20000

Reconciliation of Basic and D_3

Reconciliation of Basic and Diluted Shares - Reconciliation of Basic and Diluted Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Income (loss) from continuing operations, net of tax	$ (2,852)	$ 31,110	$ 7,622	$ 41,613
Weighted-average shares outstanding - basic (in shares)	80,328	80,861	80,119	80,756
Dilutive effect of stock-based compensation (in shares)	0	2,782	1,955	2,838
Weighted-average shares outstanding - diluted (in shares)	80,328	83,643	82,074	83,594
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic (in dollars per share)	$ (0.04)	$ 0.38	$ 0.10	$ 0.52
Diluted (in dollars per share)	$ (0.04)	$ 0.37	$ 0.09	$ 0.50

Reconciliation of Basic and D_4

Reconciliation of Basic and Diluted Shares - Antidilutive Securities Excluded from Computation of Earnings per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restricted Stock Units (RSUs) [Member]
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	443	0	0	0
Stock appreciation rights
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	1,919	283	389	489
Performance share units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	685	0	116	0

Derivative Instruments, Hedgi_3

Derivative Instruments, Hedging Activities and Fair Value - Fair Value of Outstanding Derivative Contracts (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative contracts
Asset derivatives	$ 7,116	$ 5,018
Liability derivatives	6,691	4,783
Foreign currency exchange forward contracts | Other current assets
Derivative contracts
Asset derivatives	7,116	3,559
Foreign currency exchange forward contracts | Other current liabilities
Derivative contracts
Liability derivatives	833	2,934
Interest rate swaps | Other current assets
Derivative contracts
Asset derivatives		1,331
Interest rate swaps | Other assets
Derivative contracts
Asset derivatives		128
Interest rate swaps | Other current liabilities
Derivative contracts
Liability derivatives	1,227
Interest rate swaps | Other liabilities
Derivative contracts
Liability derivatives	4,631	1,849
Fair Value of Derivatives Designated as Hedging Instruments
Derivative contracts
Asset derivatives	2,855	4,429
Liability derivatives	5,894	1,873
Fair Value of Derivatives Designated as Hedging Instruments | Foreign currency exchange forward contracts | Other current assets
Derivative contracts
Asset derivatives	2,855	2,970
Fair Value of Derivatives Designated as Hedging Instruments | Foreign currency exchange forward contracts | Other current liabilities
Derivative contracts
Liability derivatives	36	24
Fair Value of Derivatives Designated as Hedging Instruments | Interest rate swaps | Other current assets
Derivative contracts
Asset derivatives		1,331
Fair Value of Derivatives Designated as Hedging Instruments | Interest rate swaps | Other assets
Derivative contracts
Asset derivatives		128
Fair Value of Derivatives Designated as Hedging Instruments | Interest rate swaps | Other current liabilities
Derivative contracts
Liability derivatives	1,227
Fair Value of Derivatives Designated as Hedging Instruments | Interest rate swaps | Other liabilities
Derivative contracts
Liability derivatives	4,631	1,849
Fair Value of Derivatives Not Designated as Hedging Instruments
Derivative contracts
Asset derivatives	4,261	589
Liability derivatives	797	2,910
Fair Value of Derivatives Not Designated as Hedging Instruments | Foreign currency exchange forward contracts | Other current assets
Derivative contracts
Asset derivatives	4,261	589
Fair Value of Derivatives Not Designated as Hedging Instruments | Foreign currency exchange forward contracts | Other current liabilities
Derivative contracts
Liability derivatives	797	2,910
Fair Value of Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other current assets
Derivative contracts
Asset derivatives		0
Fair Value of Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other assets
Derivative contracts
Asset derivatives		0
Fair Value of Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other current liabilities
Derivative contracts
Liability derivatives	0
Fair Value of Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other liabilities
Derivative contracts
Liability derivatives	$ 0	$ 0

Derivative Instruments, Hedgi_4

Derivative Instruments, Hedging Activities and Fair Value - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2022	Dec. 31, 2018	Feb. 28, 2018
Foreign Currency Derivatives
Liabilities	$ 2,185,580,000	$ 2,185,580,000		$ 2,185,580,000			$ 1,319,491,000
Pre-tax net gains (losses) on certain loans designated as hedges of net investments in foreign subsidiaries		(5,500,000)	$ (16,100,000)	(700,000)	$ (6,600,000)
Repayment of Term Loan Facility	2,800,000
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		2,384,000		2,365,000
Subject to Master Netting Agreements
Foreign Currency Derivatives
Liabilities	1,500,000	1,500,000		1,500,000			100,000
Foreign currency exchange forward contracts
Foreign Currency Derivatives
Notional amounts	460,200,000	460,200,000		460,200,000			423,900,000
Term Loan Facility, Fixed-Rate | Term Loan
Foreign Currency Derivatives
Principal amount	200,000,000	200,000,000		$ 200,000,000				$ 300,000,000
LIBOR | Term Loan Facility, Fixed-Rate | Term Loan
Foreign Currency Derivatives
Variable rate basis spread				2.12%
LIBOR | Scenario, Forecast | Term Loan Facility, Fixed-Rate | Term Loan
Foreign Currency Derivatives
Variable rate basis spread						3.12%
Income from discontinued businesses | Interest rate swaps
Foreign Currency Derivatives
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring		(2,741,000)		$ (2,741,000)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0		0
Floating-Rate To Fixed-Rate
Foreign Currency Derivatives
Converted debt	100,000,000
Estimate of Fair Value Measurement
Foreign Currency Derivatives
Long-term debt	1,361,100,000	1,361,100,000		1,361,100,000			592,000,000
Reported Value Measurement
Foreign Currency Derivatives
Long-term debt	$ 1,343,800,000	$ 1,343,800,000		$ 1,343,800,000			$ 605,400,000

Derivative Instruments, Hedgi_5

Derivative Instruments, Hedging Activities and Fair Value - Effect of Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Effect of derivative instruments
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives	$ (3,604)		$ (7,677)
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives		$ 3,703		$ 7,160
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity	(2,384)		(2,365)
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity		245		(1,216)
Foreign currency exchange forward contracts
Effect of derivative instruments
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives	669		(43)
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives		1,539		1,779
Foreign currency exchange forward contracts | Cost of services and products sold
Effect of derivative instruments
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity	389		421
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity		103		(109)
Foreign currency exchange forward contracts | Retained earnings
Effect of derivative instruments
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity			0
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity				(1,520)
Foreign currency exchange forward contracts
Effect of derivative instruments
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives			0
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives				0
Interest rate swaps
Effect of derivative instruments
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives	0		0
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives		0		0
Interest rate swaps | Income from discontinued businesses
Effect of derivative instruments
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity	0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	2,741		2,741
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity		0		0
Interest rate swaps | Interest Expense
Effect of derivative instruments
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity	271		572
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	0		0
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity		(235)		(235)
Interest rate swaps
Effect of derivative instruments
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives	(4,327)		(7,636)
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives		2,071		5,381
Cross currency interest rate swaps
Effect of derivative instruments
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives	54		2
Amount Recognized in Other Comprehensive Income (“OCI”) on Derivatives		93		0
Cross currency interest rate swaps | Income from discontinued businesses
Effect of derivative instruments
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity	0		0
Cross currency interest rate swaps | Interest Expense
Effect of derivative instruments
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity	$ (303)		$ (617)
Amount Reclassified from Accumulated OCI into Income - Effective Portion or Equity		$ 377		$ 648

Derivative Instruments, Hedgi_6

Derivative Instruments, Hedging Activities and Fair Value - Derivatives Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative [Line Items]
Product Revenues	$ 350,898	$ 339,907	$ 680,800	$ 664,347
Interest Expense	(6,103)	(5,681)	(11,610)	(11,271)
Income From Discontinued Businesses	9,936	11,988	23,686	21,233
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(2,384)		(2,365)
Product Revenues | Interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	0		0
Product Revenues | Foreign exchange contracts
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	433		465
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		(103)		109
Amount excluded from effectiveness testing recognized in earnings	238		316
Amount excluded from effectiveness testing recognized in earnings		0		0
Product Revenues | Cross-currency interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0		0
Cost of Services Sold | Interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0	0	0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	0		0
Cost of Services Sold | Foreign exchange contracts
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(44)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0	(44)	0
Amount excluded from effectiveness testing recognized in earnings	0
Amount excluded from effectiveness testing recognized in earnings		12	0	(7)
Cost of Services Sold | Cross-currency interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0	0	0	0
Interest Expense | Interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	271		572
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		235		235
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	0		0
Interest Expense | Foreign exchange contracts
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0		0
Amount excluded from effectiveness testing recognized in earnings	0		0
Amount excluded from effectiveness testing recognized in earnings		0		0
Interest Expense | Cross-currency interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(303)		(617)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		(377)		(648)
Income From Discontinued Businesses | Interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	(2,741)		(2,741)
Income From Discontinued Businesses | Foreign exchange contracts
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Amount excluded from effectiveness testing recognized in earnings	0		0
Income From Discontinued Businesses | Cross-currency interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Cost of services and products sold | Foreign currency exchange forward contracts
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	389		421
Amount of Gain Recognized in Income on Derivatives	2,770	15,731	5,094	10,265
Product Revenues
Derivative [Line Items]
Product Revenues	112,895	94,199	213,277	174,429
Cost of services sold	79,355	64,849	148,664	123,802
Products And Services, Service Revenue [Member]
Derivative [Line Items]
Product Revenues	238,003	245,708	467,523	489,918
Cost of services sold	$ 186,840	$ 187,393	$ 368,711	$ 379,068

Review of Operations by Segme_3

Review of Operations by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operations by segment
Revenues	$ 350,898	$ 339,907	$ 680,800	$ 664,347
Operating income from continuing operations	17,799	38,064	37,623	60,792
Interest income	591	577	1,124	1,070
Interest expense	(6,103)	(5,681)	(11,610)	(11,271)
Unused debt commitment and amendment fees	(7,435)	0	(7,435)	0
Gain (Loss) on Extinguishment of Debt	0	(1,034)	0	(1,034)
Defined benefit pension income (expense)	1,472	(904)	2,810	(1,743)
Income from continuing operations before income taxes and equity income	3,380	32,830	16,892	51,300
Depreciation and Amortization	31,123	31,336	62,347	62,834
Capital Expenditures	51,747	26,683	85,979	52,493
Operating Segments
Operations by segment
Operating income from continuing operations	37,020	44,279	66,906	73,966
Corporate
Operations by segment
Revenues	0	35	0	74
Operating income from continuing operations	(19,221)	(6,215)	(29,283)	(13,174)
Depreciation and Amortization	1,417	1,665	2,769	3,014
Capital Expenditures	287	172	1,440	376
Harsco Environmental Segment | Operating Segments
Operations by segment
Revenues	269,338	272,320	530,650	537,043
Operating income from continuing operations	27,577	35,661	52,074	63,396
Depreciation and Amortization	28,497	28,632	57,202	57,717
Capital Expenditures	45,095	24,423	74,258	49,599
Harsco Clean Earth Segment | Operating Segments
Operations by segment
Revenues	0	0	0	0
Operating income from continuing operations	0	0	0	0
Depreciation and Amortization	0	0	0	0
Capital Expenditures	0	0	0	0
Harsco Rail Segment | Operating Segments
Operations by segment
Revenues	81,560	67,552	150,150	127,230
Operating income from continuing operations	9,443	8,618	14,832	10,570
Depreciation and Amortization	1,209	1,039	2,376	2,103
Capital Expenditures	$ 6,365	$ 2,088	$ 10,281	$ 2,518

Revenue Recognition - Revenues

Revenue Recognition - Revenues by Primary Geographical Markets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 350,898	$ 339,907	$ 680,800	$ 664,347
On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems
Disaggregation of Revenue [Line Items]
Total revenues	269,338	272,320	530,650	537,043
Environmental solutions for contaminated materials, hazardous waste and dredged materials
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Railway track maintenance services and equipment
Disaggregation of Revenue [Line Items]
Total revenues	81,560	67,552	150,150	127,230
General Corporate
Disaggregation of Revenue [Line Items]
Total revenues		35		74
North America
Disaggregation of Revenue [Line Items]
Total revenues	143,390	127,444	267,104	238,953
Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	109,016	110,451	217,250	222,092
Latin America
Disaggregation of Revenue [Line Items]
Total revenues	37,045	38,719	74,627	81,010
Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	40,750	43,421	82,509	83,362
Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	15,742	12,150	29,657	23,703
Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	4,955	7,722	9,653	15,227
Harsco Environmental Segment | North America
Disaggregation of Revenue [Line Items]
Total revenues	78,112
Harsco Clean Earth Segment | North America
Disaggregation of Revenue [Line Items]
Total revenues	0
Harsco Rail Segment | North America
Disaggregation of Revenue [Line Items]
Total revenues	65,278
Operating Segments | Harsco Environmental Segment
Disaggregation of Revenue [Line Items]
Total revenues	269,338	272,320	530,650	537,043
Operating Segments | Harsco Environmental Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems
Disaggregation of Revenue [Line Items]
Total revenues	269,338	272,320	530,650	537,043
Operating Segments | Harsco Environmental Segment | Environmental solutions for contaminated materials, hazardous waste and dredged materials
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Environmental Segment | Railway track maintenance services and equipment
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Environmental Segment | General Corporate
Disaggregation of Revenue [Line Items]
Total revenues		0		0
Operating Segments | Harsco Environmental Segment | North America
Disaggregation of Revenue [Line Items]
Total revenues		79,862	151,461	150,927
Operating Segments | Harsco Environmental Segment | Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	98,478	97,410	196,699	194,331
Operating Segments | Harsco Environmental Segment | Latin America
Disaggregation of Revenue [Line Items]
Total revenues	36,272	37,388	73,263	78,846
Operating Segments | Harsco Environmental Segment | Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	35,779	37,788	69,917	74,009
Operating Segments | Harsco Environmental Segment | Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	15,742	12,150	29,657	23,703
Operating Segments | Harsco Environmental Segment | Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	4,955	7,722	9,653	15,227
Operating Segments | Harsco Clean Earth Segment
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Clean Earth Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Clean Earth Segment | Environmental solutions for contaminated materials, hazardous waste and dredged materials
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Clean Earth Segment | Railway track maintenance services and equipment
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Clean Earth Segment | General Corporate
Disaggregation of Revenue [Line Items]
Total revenues		0		0
Operating Segments | Harsco Clean Earth Segment | North America
Disaggregation of Revenue [Line Items]
Total revenues		0	0	0
Operating Segments | Harsco Clean Earth Segment | Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Clean Earth Segment | Latin America
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Clean Earth Segment | Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Clean Earth Segment | Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Clean Earth Segment | Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Rail Segment
Disaggregation of Revenue [Line Items]
Total revenues	81,560	67,552	150,150	127,230
Operating Segments | Harsco Rail Segment | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Rail Segment | Environmental solutions for contaminated materials, hazardous waste and dredged materials
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Rail Segment | Railway track maintenance services and equipment
Disaggregation of Revenue [Line Items]
Total revenues	81,560	67,552	150,150	127,230
Operating Segments | Harsco Rail Segment | General Corporate
Disaggregation of Revenue [Line Items]
Total revenues		0		0
Operating Segments | Harsco Rail Segment | North America
Disaggregation of Revenue [Line Items]
Total revenues		47,547	115,643	87,952
Operating Segments | Harsco Rail Segment | Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	10,538	13,041	20,551	27,761
Operating Segments | Harsco Rail Segment | Latin America
Disaggregation of Revenue [Line Items]
Total revenues	773	1,331	1,364	2,164
Operating Segments | Harsco Rail Segment | Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	4,971	5,633	12,592	9,353
Operating Segments | Harsco Rail Segment | Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments | Harsco Rail Segment | Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate
Disaggregation of Revenue [Line Items]
Total revenues	0	35	0	74
Corporate | On-site services and material logistics, product quality improvement and resource recovery for iron, steel and metals manufacturing; value- added environmental solutions for industrial co-products; as well as aluminum dross and scrap processing systems
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate | Environmental solutions for contaminated materials, hazardous waste and dredged materials
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 | General Corporate
Disaggregation of Revenue [Line Items]
Total revenues		35		74
Corporate | North America
Disaggregation of Revenue [Line Items]
Total revenues	0	35	0	74
Corporate | Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
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 - Narrative

Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Total contract assets	$ 8.2	$ 8.2	$ 12.1
Total advances on contracts	55.4	55.4	$ 67.1
Revenue recognized	$ 19	$ 37

Revenue Recognition - Remaining

Revenue Recognition - Remaining Performance Obligation (Details) $ in Millions	Jun. 30, 2019USD ($)
Harsco Environmental 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	$ 42.6
Period of expected timing of satisfaction	1 year
Harsco Environmental Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 31.1
Period of expected timing of satisfaction	1 year
Harsco Environmental Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 24.2
Period of expected timing of satisfaction	1 year
Harsco Environmental Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 21.3
Period of expected timing of satisfaction	1 year
Harsco Environmental Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Period of expected timing of satisfaction	1 year
Harsco Environmental 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	$ 124.2
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	$ 93.3
Period of expected timing of satisfaction	1 year
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 61.9
Period of expected timing of satisfaction	1 year
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 34.4
Period of expected timing of satisfaction	1 year
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 13.1
Period of expected timing of satisfaction	1 year
Harsco Rail Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
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	$ 202.7

Other (Income) Expenses, Net (D

Other (Income) Expenses, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Income and Expenses [Abstract]
Employee termination benefit costs	$ 997	$ 769	$ 3,516	$ 2,174
Net gains	0	(1,097)	(2,271)	(1,097)
Other costs to exit activities	1,192	(25)	2,347	227
Impaired asset write-downs	0	104	214	104
Contingent consideration adjustments	(3,880)	0	(3,511)	0
Other	(26)	(765)	(269)	(758)
Other (income) expenses, net	$ (1,717)	$ (1,014)	$ 26	$ 650

Components of Accumulated Oth_3

Components of Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Jan. 01, 2018
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances	$ 335,272	$ 313,376	$ 246,345	$ 215,165	$ 313,376	$ 215,165
Accumulated other comprehensive loss			(13)			(13)	$ 0	$ 2,387
Other comprehensive income (loss) before reclassifications					(901)	(20,735)
Amounts reclassified from accumulated other comprehensive loss					9,030	9,708
Total other comprehensive income (loss)	3,598	4,531	(17,190)	6,163	8,129	(11,027)
Other comprehensive income attributable to noncontrolling interests					178	1,240
Other comprehensive income (loss) attributable to Harsco Corporation					8,307	(9,787)
Balances	349,114	335,272	266,153	246,345	349,114	266,153
Cumulative Foreign Exchange Translation Adjustments
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances		(159,810)		(111,567)	(159,810)	(111,567)
Accumulated other comprehensive loss							0
Other comprehensive income (loss) before reclassifications					2,775	(36,205)
Amounts reclassified from accumulated other comprehensive loss					(2,271)	0
Total other comprehensive income (loss)					504	(36,205)
Other comprehensive income attributable to noncontrolling interests					178	1,240
Other comprehensive income (loss) attributable to Harsco Corporation					682	(34,965)
Balances	(159,128)		(146,532)		(159,128)	(146,532)
Effective Portion of Deriviatives Designated as Hedging Instruments
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances		1,389		808	1,389	808
Accumulated other comprehensive loss							0
Other comprehensive income (loss) before reclassifications					(5,893)	5,482
Amounts reclassified from accumulated other comprehensive loss					1,722	97
Total other comprehensive income (loss)					(4,171)	5,579
Other comprehensive income attributable to noncontrolling interests					0	0
Other comprehensive income (loss) attributable to Harsco Corporation					(4,171)	5,579
Balances	(2,782)		4,867		(2,782)	4,867
Cumulative Unrecognized Actuarial Losses on Pension Obligations
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances		(408,655)		(435,840)	(408,655)	(435,840)
Accumulated other comprehensive loss							(21,429)
Other comprehensive income (loss) before reclassifications					2,192	10,015
Amounts reclassified from accumulated other comprehensive loss					9,579	9,611
Total other comprehensive income (loss)					11,771	19,626
Other comprehensive income attributable to noncontrolling interests					0	0
Other comprehensive income (loss) attributable to Harsco Corporation					11,771	19,626
Balances	(418,313)		(416,214)		(418,313)	(416,214)
Unrealized Loss on Marketable Securities
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances		(31)		17	(31)	17
Accumulated other comprehensive loss							0
Other comprehensive income (loss) before reclassifications					25	(27)
Amounts reclassified from accumulated other comprehensive loss					0	0
Total other comprehensive income (loss)					25	(27)
Other comprehensive income attributable to noncontrolling interests					0	0
Other comprehensive income (loss) attributable to Harsco Corporation					25	(27)
Balances	(6)		(10)		(6)	(10)
Accumulated Other Comprehensive Loss
Components of Accumulated Other Comprehensive Income [Roll Forward]
Balances	(584,425)	(567,107)	(543,217)	(546,582)	(567,107)	(546,582)
Accumulated other comprehensive loss							$ (21,429)	(1,520)
Total other comprehensive income (loss)	4,196	4,111	(14,672)	4,885
Balances	$ (580,229)	$ (584,425)	$ (557,889)	(543,217)	$ (580,229)	$ (557,889)
Accounting Standards Update 2014-09 | Accumulated Other Comprehensive Loss
Components of Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive loss				$ (1,520)
Accounting Standards Update 2014-09 | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Components of Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive loss								$ (1,520)

Components of Accumulated Oth_4

Components of Accumulated Other Comprehensive Loss - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	$ 0		$ 0		$ (2,271)	$ 0
Product revenues	350,898		339,907		680,800	664,347
Interest expense	6,103		5,681		11,610	11,271
Income from continuing operations before income taxes	3,380		32,830		16,892	51,300
Income tax expense (benefit)	3,994		(502)		5,213	5,696
Net income	10,929	$ 22,537	42,711	$ 19,577	33,466	62,288
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	5,176		4,955		10,300	10,224
Income tax expense (benefit)	(379)		(288)		(721)	(613)
Net income	4,797		4,667		9,579	9,611
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	2,384		245		2,365	304
Income tax expense (benefit)	(599)		(57)		(643)	(207)
Net income	1,785		188		1,722	97
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments | Foreign currency exchange forward contracts
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Product revenues	(433)		103		(465)	(109)
Cost of services sold	44		0		44	0
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	303		377		617	648
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	(271)		(235)		(572)	(235)
Income before income taxes	2,741		0		2,741	0
Amount Reclassified from Accumulated Other Comprehensive Loss | Actuarial losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit pension income (expense)	4,982		4,992		10,040	10,134
Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs (benefits)
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit pension income (expense)	65		(37)		131	(76)
Amount Reclassified from Accumulated Other Comprehensive Loss | Settlement/curtailment losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit pension income (expense)	$ 129		$ 0		$ 129	$ 166

Uncategorized Items - hsc-06302

Label	Element	Value
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 21,429,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 3,907,000