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GOODWILL AND OTHER INTANGIBLE ASSETS | 3 Months Ended
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Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER INTANGIBLE ASSETS | GOODWILL AND OTHER INTANGIBLE ASSETS The changes in goodwill by segment for the three months ended March 31, 2026 were as follows (in thousands):
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Totals
Balance at January 1, 2026 | $ | 1,297,478 |  |  | $ | 181,572 |  |  | $ | 1,479,050 |
Increase from current period acquisition | 76,823 |  |  | — |  |  | 76,823 |
Foreign currency translation | (576) |  |  | (235) |  |  | (811) |
Balance at March 31, 2026 | $ | 1,373,725 |  |  | $ | 181,337 |  |  | $ | 1,555,062 |
The Company assesses goodwill for impairment on an annual basis as of December 31 or at an interim date when it is more likely than not that events or changes in the business environment (“triggering events”) would reduce the fair value of a reporting unit below its carrying value. During the period ended March 31, 2026, no such triggering events were identified. As of March 31, 2026 and December 31, 2025, the Company’s intangible assets consisted of the following (in thousands):
| March 31, 2026 |  | December 31, 2025
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Permits | $ | 195,724 |  |  | $ | 133,851 |  |  | $ | 61,873 |  |  | $ | 196,224 |  |  | $ | 132,308 |  |  | $ | 63,916 |
Customer and supplier relationships | 720,514 |  |  | 284,028 |  |  | 436,486 |  |  | 698,381 |  |  | 292,813 |  |  | 405,568 |
Other intangible assets | 121,009 |  |  | 60,085 |  |  | 60,924 |  |  | 121,030 |  |  | 57,438 |  |  | 63,592 |
Total amortizable permits and other intangible assets | 1,037,247 |  |  | 477,964 |  |  | 559,283 |  |  | 1,015,635 |  |  | 482,559 |  |  | 533,076 |
Trademarks and trade names | 119,798 |  |  | — |  |  | 119,798 |  |  | 119,951 |  |  | — |  |  | 119,951 |
Total permits and other intangible assets | $ | 1,157,045 |  |  | $ | 477,964 |  |  | $ | 679,081 |  |  | $ | 1,135,586 |  |  | $ | 482,559 |  |  | $ | 653,027 |
Amortization expense of permits, customer and supplier relationships and other intangible assets was $13.7 million and $13.3 million in the three months ended March 31, 2026 and March 31, 2025, respectively. The expected amortization of the net carrying amount of finite-lived intangible assets at March 31, 2026 was as follows (in thousands):
Years Ending December 31, | Expected Amortization
2026 (nine months) | $ | 41,795 |
2027 | 54,184 |
2028 | 52,816 |
2029 | 51,738 |
2030 | 41,163 |
Thereafter | 317,587 |
| $ | 559,283 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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