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GOODWILL AND OTHER INTANGIBLE ASSETS | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER INTANGIBLE ASSETS | GOODWILL AND OTHER INTANGIBLE ASSETS The changes in goodwill by segment for the six months ended June 30, 2019 were as follows (in thousands):
| Environmental Services |  | Safety-Kleen |  | Totals
Balance at January 1, 2019 | $ | 207,019 |  |  | $ | 307,170 |  |  | $ | 514,189 |
Increase from current period acquisitions | 7,311 |  |  | 5,225 |  |  | 12,536 |
Measurement period adjustments from prior period acquisitions | (2,611 | ) |  | (1,421 | ) |  | (4,032 | )
Foreign currency translation | 1,089 |  |  | 1,262 |  |  | 2,351 |
Balance at June 30, 2019 | $ | 212,808 |  |  | $ | 312,236 |  |  | $ | 525,044 |
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 of June 30, 2019 and December 31, 2018, the Company's total intangible assets consisted of the following (in thousands):
| June 30, 2019 |  | December 31, 2018
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Permits | $ | 182,063 |  |  | $ | 83,278 |  |  | $ | 98,785 |  |  | $ | 177,583 |  |  | $ | 79,358 |  |  | $ | 98,225 |
Customer and supplier relationships | 401,296 |  |  | 195,036 |  |  | 206,260 |  |  | 393,487 |  |  | 179,824 |  |  | 213,663 |
Other intangible assets | 38,198 |  |  | 32,266 |  |  | 5,932 |  |  | 37,262 |  |  | 29,743 |  |  | 7,519 |
Total amortizable permits and other intangible assets | 621,557 |  |  | 310,580 |  |  | 310,977 |  |  | 608,332 |  |  | 288,925 |  |  | 319,407 |
Trademarks and trade names | 122,876 |  |  | — |  |  | 122,876 |  |  | 122,468 |  |  | — |  |  | 122,468 |
Total permits and other intangible assets | $ | 744,433 |  |  | $ | 310,580 |  |  | $ | 433,853 |  |  | $ | 730,800 |  |  | $ | 288,925 |  |  | $ | 441,875 |
Amortization expense of permits and other intangible assets was $8.7 million and $18.2 million in the three and six months ended June 30, 2019, respectively. Amortization expense of permits and other intangible assets was $8.6 million and $17.8 million in the three and six months ended June 30, 2018, respectively. The expected amortization of the net carrying amount of finite-lived intangible assets at June 30, 2019 was as follows (in thousands):
Years Ending December 31, | Expected Amortization
2019 (six months) | $ | 16,748 |
2020 | 31,943 |
2021 | 28,661 |
2022 | 28,231 |
2023 | 24,090 |
Thereafter | 181,304 |
| $ | 310,977 |

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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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