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Revenue Recognition
 12 Months Ended
Dec. 31, 2021
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 Segment. Product revenues include portions of the Harsco Environmental Segment. See Note 1, Summary of Significant Accounting Policies, Revenue Recognition, for additional information.
A summary of the Company's revenues by primary geographical markets as well as by key product and service groups is as follows:
Twelve Months Ended
December 31, 2021
(In thousands)Harsco
Environmental Segment		Harsco
Clean Earth Segment		Consolidated Totals
Primary Geographical Markets (a)(b):
North America$281,124 $780,317 $1,061,441 
Western Europe442,286 — 442,286 
Latin America (c)
132,349 — 132,349 
Asia-Pacific110,790 — 110,790 
Middle East and Africa81,337 — 81,337 
Eastern Europe 20,196 — 20,196 
Total Revenues $1,068,082 $780,317 $1,848,399 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing; and related logistical services$920,579 $— $920,579 
Ecoproducts132,389 — 132,389 
Environmental systems for aluminum dross and scrap processing15,114 — 15,114 
Waste processing and reuse solutions— 780,317 780,317 
Total Revenues$1,068,082 $780,317 $1,848,399 
Twelve Months Ended
December 31, 2020
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth Segment		Consolidated Totals
Primary Geographical Markets (a)(b):
North America$249,904 $619,588 $869,492 
Western Europe377,066 — 377,066 
Latin America (c)
119,457 — 119,457 
Asia-Pacific87,608 — 87,608 
Middle East and Africa63,427 — 63,427 
Eastern Europe 16,983 — 16,983 
Total Revenues$914,445 $619,588 $1,534,033 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing; and related logistical services$781,060 $— $781,060 
Ecoproducts120,432 — 120,432 
Environmental systems for aluminum dross and scrap processing12,953 — 12,953 
Waste processing and reuse solutions— 619,588 619,588 
Total Revenues$914,445 $619,588 $1,534,033 
Twelve Months Ended
December 31, 2019
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth Segment		Consolidated Totals
Primary Geographical Markets (b):
North America$294,367 $169,522 $463,889 
Western Europe386,593 — 386,593 
Latin America (c)
146,040 — 146,040 
Asia-Pacific128,949 — 128,949 
Middle East and Africa60,402 — 60,402 
Eastern Europe 18,496 — 18,496 
Total Revenues$1,034,847 $169,522 $1,204,369 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services$888,851 $— $888,851 
Ecoproducts127,874 — 127,874 
Environmental systems for aluminum dross and scrap processing18,122 — 18,122 
Waste processing and reuse solutions— 169,522 169,522 
Total Revenues$1,034,847 $169,522 $1,204,369 
(a)     The Company acquired ESOL in 2020 and Clean Earth in 2019. The results of both are included in the Harsco Clean Earth Segment. The operating results of the former Harsco Rail Segment and Harsco Industrial Segment have been reflected as discontinued operations in the Consolidated Statements of Operations. See Note 3, Acquisition 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 (advances on contracts), which are included in Other current liabilities and Other liabilities on the Consolidated Balance Sheets. The Company may recognize revenue in advance of being able to contractually invoice the customer (contract assets), which is included in Other current assets on the Consolidated Balance Sheets. Contract assets are transferred to Trade accounts receivable, net, when right to payment becomes unconditional. Contract assets and advances on contracts are reported as a net position, on a contract-by-contract basis, at the end of each reporting period.

The Company had contract assets totaling $3.1 million at December 31, 2021 and $2.5 million at December 31, 2020. The increase is due principally to additional contract assets recognized in excess of the transfer of contract assets to accounts receivable. The Company had advances on contracts totaling $4.1 million at December 31, 2021 and $2.7 million at December 31, 2020. The increase is due principally to the receipts of new advances on contracts in excess of the recognition of revenue on previously received advances on contracts during the period. During the year ended December 31, 2021, the Company recognized approximately $15 million of revenue related to amounts previously included in advances on contracts.
At December 31, 2021, the Harsco Environmental Segment had remaining, fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year totaling $82.8 million. Of this amount, $20.1 million is expected to be fulfilled by December 31, 2022, $19.7 million by December 31, 2023, $19.0 million by December 31, 2024, $16.6 million by December 31, 2025 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.