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GOODWILL AND OTHER INTANGIBLE ASSETS | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER INTANGIBLE ASSETS | GOODWILL AND OTHER INTANGIBLE ASSETS The changes in goodwill by segment for the nine months ended September 30, 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 acquisitions | 33,281 |  |  | 4,168 |  |  | 37,449 |
Measurement period adjustments from prior period acquisitions | (78 | ) |  | — |  |  | (78 | )
Foreign currency translation | (829 | ) |  | (963 | ) |  | (1,792 | )
Balance at September 30, 2018 | $ | 204,760 |  |  | $ | 309,342 |  |  | $ | 514,102 |
The Company assesses goodwill for impairment on an annual basis as of December 31, or at an interim date when events or changes in the business environment would more likely than not reduce the fair value of a reporting unit below its carrying value. As discussed in Note 18, “Segment Reporting,” during the first quarter of fiscal year 2018 and as a result of operational and managerial changes in several of the Company’s businesses, the identification of operating segments in accordance with ASC 280, Segment Information, was changed. As a result of the Company's conclusions about the identification of operating segments, the Company also concluded that, for purposes of reviewing for potential goodwill impairment, it now has four reporting units, consisting of Environmental Sales and Service, Environmental Facilities, Kleen Performance Products and Safety-Kleen Environmental Services. The Company allocated goodwill to the newly identified reporting units using a relative fair value approach. In addition, the Company completed an assessment of any potential goodwill impairment for all reporting units immediately prior and subsequent to the reallocation and determined that no impairment existed. As of September 30, 2018 and December 31, 2017, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):
| September 30, 2018 |  | December 31, 2017
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Permits | $ | 177,628 |  |  | $ | 78,419 |  |  | $ | 99,209 |  |  | $ | 174,721 |  |  | $ | 74,347 |  |  | $ | 100,374 |
Customer and supplier relationships | 400,292 |  |  | 178,506 |  |  | 221,786 |  |  | 399,224 |  |  | 158,972 |  |  | 240,252 |
Other intangible assets | 37,844 |  |  | 31,412 |  |  | 6,432 |  |  | 36,766 |  |  | 31,592 |  |  | 5,174 |
Total amortizable permits and other intangible assets | 615,764 |  |  | 288,337 |  |  | 327,427 |  |  | 610,711 |  |  | 264,911 |  |  | 345,800 |
Indefinite lived trademarks and trade names | 123,928 |  |  | — |  |  | 123,928 |  |  | 123,328 |  |  | — |  |  | 123,328 |
Total permits and other intangible assets | $ | 739,692 |  |  | $ | 288,337 |  |  | $ | 451,355 |  |  | $ | 734,039 |  |  | $ | 264,911 |  |  | $ | 469,128 |
Amortization expense of permits and other intangible assets was $8.1 million and $26.0 million in the three and nine months ended September 30, 2018, respectively. Amortization expense of permits and other intangible assets was $8.9 million and $27.7 million in the three and nine months ended September 30, 2017, respectively. The expected amortization of the net carrying amount of finite-lived intangible assets at September 30, 2018 was as follows (in thousands):
Years Ending December 31, | Expected Amortization
2018 (three months) | $ | 8,481 |
2019 | 32,488 |
2020 | 30,137 |
2021 | 27,645 |
2022 | 27,476 |
Thereafter | 201,200 |
| $ | 327,427 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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