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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes to goodwill | The changes in goodwill by segment for the three months ended March 31, 2018 were as follows (in thousands):
| Environmental Services |  | Safety-Kleen |  | Totals
Balance at January 1, 2018 | $ | 172,386 |  |  | $ | 306,137 |  |  | $ | 478,523 |
Increase from current period acquisition | 15,908 |  |  | — |  |  | 15,908 |
Measurement period adjustments from prior period acquisitions | (9 | ) |  | — |  |  | (9 | )
Foreign currency translation | (795 | ) |  | (922 | ) |  | (1,717 | )
Balance at March 31, 2018 | $ | 187,490 |  |  | $ | 305,215 |  |  | $ | 492,705 |
Summary of indefinite-lived intangible assets | As of March 31, 2018 and December 31, 2017, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):
| March 31, 2018 |  | December 31, 2017
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Permits | $ | 174,867 |  |  | $ | 75,493 |  |  | $ | 99,374 |  |  | $ | 174,721 |  |  | $ | 74,347 |  |  | $ | 100,374 |
Customer and supplier relationships | 400,385 |  |  | 165,056 |  |  | 235,329 |  |  | 399,224 |  |  | 158,972 |  |  | 240,252 |
Other intangible assets | 38,071 |  |  | 31,170 |  |  | 6,901 |  |  | 36,766 |  |  | 31,592 |  |  | 5,174 |
Total amortizable permits and other intangible assets | 613,323 |  |  | 271,719 |  |  | 341,604 |  |  | 610,711 |  |  | 264,911 |  |  | 345,800 |
Indefinite lived trademarks and trade names | 123,031 |  |  | — |  |  | 123,031 |  |  | 123,328 |  |  | — |  |  | 123,328 |
Total permits and other intangible assets | $ | 736,354 |  |  | $ | 271,719 |  |  | $ | 464,635 |  |  | $ | 734,039 |  |  | $ | 264,911 |  |  | $ | 469,128 |
Schedule of finite-lived intangible assets | As of March 31, 2018 and December 31, 2017, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):
| March 31, 2018 |  | December 31, 2017
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Permits | $ | 174,867 |  |  | $ | 75,493 |  |  | $ | 99,374 |  |  | $ | 174,721 |  |  | $ | 74,347 |  |  | $ | 100,374 |
Customer and supplier relationships | 400,385 |  |  | 165,056 |  |  | 235,329 |  |  | 399,224 |  |  | 158,972 |  |  | 240,252 |
Other intangible assets | 38,071 |  |  | 31,170 |  |  | 6,901 |  |  | 36,766 |  |  | 31,592 |  |  | 5,174 |
Total amortizable permits and other intangible assets | 613,323 |  |  | 271,719 |  |  | 341,604 |  |  | 610,711 |  |  | 264,911 |  |  | 345,800 |
Indefinite lived trademarks and trade names | 123,031 |  |  | — |  |  | 123,031 |  |  | 123,328 |  |  | — |  |  | 123,328 |
Total permits and other intangible assets | $ | 736,354 |  |  | $ | 271,719 |  |  | $ | 464,635 |  |  | $ | 734,039 |  |  | $ | 264,911 |  |  | $ | 469,128 |
Schedule of expected amortization for the net carrying amount of finite lived intangible assets | The expected amortization of the net carrying amount of finite-lived intangible assets at March 31, 2018 was as follows (in thousands):
Years Ending December 31, | Expected Amortization
2018 (nine months) | $ | 26,018 |
2019 | 32,247 |
2020 | 29,486 |
2021 | 27,492 |
2022 | 27,342 |
Thereafter | 199,019 |
| $ | 341,604 |

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