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Revenue Recognition
 12 Months Ended
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenues
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. Revenues from continuing operations include service revenues from HE and CE and product revenues from HE. Revenue from Rail is included in Income (loss) from discontinued businesses. 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 for the years ended December 31, 2023, 2022 and 2021 is as follows:
Year Ended December 31, 2023
(In thousands)Harsco
Environmental Segment
Clean Earth Segment
Consolidated Totals
Primary Geographical Markets (a):
North America$318,574 $928,321 $1,246,895 
Western Europe431,893 — 431,893 
Latin America (b)
170,194 — 170,194 
Asia-Pacific113,800 — 113,800 
Middle East and Africa86,867 — 86,867 
Eastern Europe 19,576 — 19,576 
Total Revenues $1,140,904 $928,321 $2,069,225 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services$950,961 $— $950,961 
Ecoproducts162,291 — 162,291 
Environmental systems for aluminum dross and scrap processing27,652 — 27,652 
Hazardous waste processing solutions— 767,338 767,338 
Soil and dredged materials processing and reuse solutions— 160,983 160,983 
Total Revenues$1,140,904 $928,321 $2,069,225 
Year Ended December 31, 2022
(In thousands)Harsco Environmental Segment
Clean Earth Segment
Consolidated Totals
Primary Geographical Markets (a):
North America$297,544 $827,826 $1,125,370 
Western Europe389,713 — 389,713 
Latin America (b)
155,235 — 155,235 
Asia-Pacific119,433 — 119,433 
Middle East and Africa79,562 — 79,562 
Eastern Europe 19,752 — 19,752 
Total Revenues$1,061,239 $827,826 $1,889,065 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services$900,426 $— $900,426 
Ecoproducts145,911 — 145,911 
Environmental systems for aluminum dross and scrap processing14,902 — 14,902 
Hazardous waste processing solutions— 681,804 681,804 
Soil and dredged materials processing and reuse solutions— 146,022 146,022 
Total Revenues$1,061,239 $827,826 $1,889,065 
Year Ended December 31, 2021
(In thousands)Harsco Environmental Segment
Clean Earth Segment
Consolidated Totals
Primary Geographical Markets (a):
North America$281,125 $780,316 $1,061,441 
Western Europe442,286 — 442,286 
Latin America (b)
132,349 — 132,349 
Asia-Pacific110,790 — 110,790 
Middle East and Africa81,337 — 81,337 
Eastern Europe 20,196 — 20,196 
Total Revenues$1,068,083 $780,316 $1,848,399 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services$920,580 $— $920,580 
Ecoproducts132,389 — 132,389 
Environmental systems for aluminum dross and scrap processing15,114 — 15,114 
Hazardous waste processing solutions— 639,233 639,233 
Soil and dredged materials processing and reuse solutions— 141,083 141,083 
Total Revenues$1,068,083 $780,316 $1,848,399 
(a)     Revenues are attributed to individual countries based on the location of the facility generating the revenue.
(b)    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 the 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 $8.5 million and $5.3 million at December 31, 2023 and 2022, respectively. 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 $5.6 million and $6.8 million at December 31, 2023 and 2022, respectively. The decrease is due principally to recognition of revenue on previously received advances on contracts in excess of receipts of new advances on contracts during the period. During the year ended December 31, 2023, the Company recognized approximately $6.5 million of revenue related to amounts previously included in advances on contracts.
At December 31, 2023, HE had remaining, fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year, totaling $60.6 million. Of this amount, $21.6 million is expected to be fulfilled by December 31, 2024, $19.3 million by December 31, 2025, $8.0 million by December 31, 2026, $5.2 million by December 31, 2027 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.