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Other Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net gains |  | $ (6,303) | $ (3,868) | $ (1,354)
Employee termination benefit costs |  | 6,619 | 4,763 | 6,733
Costs to exit activities |  | 4,208 | 170 | 1,262
Impaired asset write-downs |  | 773 | 104 | 874
Contingent Consideration Adjustments |  | 7,681 | 2,939 | 0
Other expense |  | (237) | (431) | (188)
Total |  | $ (2,621) | (2,201) | 7,327
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 35.00% |  |
Clean Earth |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Employee termination benefit costs |  | $ 1,960 | 0 | 0
Contingent Consideration Adjustments |  | 825 | 0 |
Harsco Rail |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Employee termination benefit costs |  | 2,393 | 704 | 1,133
Costs to exit activities |  | 3,042 | 0 | 0
Impaired asset write-downs |  | 141 | 0 | 0
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains |  | 0 | (1,218) | 0
Employee termination benefit costs |  | 1,012 | 1,206 | 1,189
Costs to exit activities |  | 196 | (182) | 556
Impaired asset write-downs |  | 0 | 0 | 168
Harsco Environmental |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains |  | (6,303) | (2,650) | (1,354)
Employee termination benefit costs |  | 1,254 | 2,853 | 4,411
Costs to exit activities |  | 970 | 352 | 706
Impaired asset write-downs |  | 632 | 104 | 706
Contingent Consideration Adjustments | $ 8,500 | $ 8,506 | $ (2,939) | $ 0

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- Definition The charge against earnings in the period, comprised of costs incurred associated with an exit or disposal activity other than for a discontinued operations as defined under generally accepted accounting principles. Costs of such activities include those for termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. + References No definition available. + Details
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