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GOODWILL AND OTHER INTANGIBLE ASSETS | 6 Months Ended
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Jun. 30, 2017
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, 2017 were as follows (in thousands):
| Technical Services |  | Industrial & Field Services |  | Safety-Kleen |  | Oil, Gas and Lodging Services |  | Totals
Balance at January 1, 2017 | $ | 61,116 |  |  | $ | 107,968 |  |  | $ | 296,070 |  |  | $ | — |  |  | $ | 465,154 |
Increase from current period acquisitions | — |  |  | — |  |  | 4,916 |  |  | — |  |  | 4,916 |
Measurement period adjustments from prior period acquisitions | — |  |  | — |  |  | 2,186 |  |  | — |  |  | 2,186 |
Decrease from disposition of business | (1,300 | ) |  | — |  |  | — |  |  |  |  | (1,300 | )
Foreign currency translation and other | 157 |  |  | 615 |  |  | 1,091 |  |  | — |  |  | 1,863 |
Balance at June 30, 2017 | $ | 59,973 |  |  | $ | 108,583 |  |  | $ | 304,263 |  |  | $ | — |  |  | $ | 472,819 |
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. The Company conducted the annual impairment test of goodwill for all reporting units as of December 31, 2016 and determined that no adjustment to the carrying value of goodwill for any reporting units was necessary because the fair value of each of the reporting units exceeded that reporting unit's respective carrying value. As a result of the sale of the Transformer Services business discussed in Note 4, "Disposition of Business," to the accompanying financial statements, the Company assessed qualitative factors to determine whether it was more likely than not that the fair value of the remaining Technical Services reporting unit was less than its carrying value. As a result of its qualitative assessment, the Company noted no indicators of impairment for the remaining Technical Services reporting unit existed as of June 30, 2017. As of June 30, 2017 and December 31, 2016, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):
| June 30, 2017 |  | December 31, 2016
| Cost |  | Accumulated Amortization |  | Net |  | Weighted Average Remaining Amortization Period (in years) |  | Cost |  | Accumulated Amortization |  | Net |  | Weighted Average Remaining Amortization Period (in years)
Permits | $ | 173,174 |  |  | $ | 70,698 |  |  | $ | 102,476 |  |  | 21.4 |  | $ | 171,637 |  |  | $ | 67,301 |  |  | $ | 104,336 |  |  | 18.9
Customer and supplier relationships | 395,911 |  |  | 143,038 |  |  | 252,873 |  |  | 11.9 |  | 393,426 |  |  | 127,462 |  |  | 265,964 |  |  | 12.2
Other intangible assets | 34,673 |  |  | 30,166 |  |  | 4,507 |  |  | 7.5 |  | 34,254 |  |  | 28,456 |  |  | 5,798 |  |  | 7.1
Total amortizable permits and other intangible assets | 603,758 |  |  | 243,902 |  |  | 359,856 |  |  | 14.5 |  | 599,317 |  |  | 223,219 |  |  | 376,098 |  |  | 13.9
Trademarks and trade names | 122,972 |  |  | — |  |  | 122,972 |  |  | Indefinite |  | 122,623 |  |  | — |  |  | 122,623 |  |  | Indefinite
Total permits and other intangible assets | $ | 726,730 |  |  | $ | 243,902 |  |  | $ | 482,828 |  |  |  |  | $ | 721,940 |  |  | $ | 223,219 |  |  | $ | 498,721 |  |  |
Amortization expense of permits and other intangible assets was $9.7 million and $18.8 million for the three and six months ended June 30, 2017, respectively. Amortization expense of permits and other intangible assets was $9.9 million and $19.5 million for the three and six months ended June 30, 2016, respectively. The expected amortization of the net carrying amount of finite-lived intangible assets at June 30, 2017 was as follows (in thousands):
Years Ending December 31, | Expected Amortization
2017 (six months) | $ | 18,078 |
2018 | 34,091 |
2019 | 31,238 |
2020 | 28,756 |
2021 | 26,557 |
Thereafter | 221,136 |
| $ | 359,856 |

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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