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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes to goodwill | The changes in goodwill by segment for the nine months ended September 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 | — |  |  | 2,999 |  |  | 5,613 |  |  | — |  |  | 8,612 |
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 | 338 |  |  | 1,398 |  |  | 2,340 |  |  | — |  |  | 4,076 |
Balance at September 30, 2017 | $ | 60,154 |  |  | $ | 112,365 |  |  | $ | 306,209 |  |  | $ | — |  |  | $ | 478,728 |
Summary of indefinite-lived intangible assets | As of September 30, 2017 and December 31, 2016, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):
| September 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 | $ | 174,571 |  |  | $ | 72,788 |  |  | $ | 101,783 |  |  | 21.2 |  | $ | 171,637 |  |  | $ | 67,301 |  |  | $ | 104,336 |  |  | 18.9
Customer and supplier relationships | 398,778 |  |  | 151,744 |  |  | 247,034 |  |  | 11.5 |  | 393,426 |  |  | 127,462 |  |  | 265,964 |  |  | 12.2
Other intangible assets | 36,077 |  |  | 31,414 |  |  | 4,663 |  |  | 7.3 |  | 34,254 |  |  | 28,456 |  |  | 5,798 |  |  | 7.1
Total amortizable permits and other intangible assets | 609,426 |  |  | 255,946 |  |  | 353,480 |  |  | 14.2 |  | 599,317 |  |  | 223,219 |  |  | 376,098 |  |  | 13.9
Trademarks and trade names | 124,159 |  |  | — |  |  | 124,159 |  |  | Indefinite |  | 122,623 |  |  | — |  |  | 122,623 |  |  | Indefinite
Total permits and other intangible assets | $ | 733,585 |  |  | $ | 255,946 |  |  | $ | 477,639 |  |  |  |  | $ | 721,940 |  |  | $ | 223,219 |  |  | $ | 498,721 |  |  |
Schedule of finite-lived intangible assets | As of September 30, 2017 and December 31, 2016, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):
| September 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 | $ | 174,571 |  |  | $ | 72,788 |  |  | $ | 101,783 |  |  | 21.2 |  | $ | 171,637 |  |  | $ | 67,301 |  |  | $ | 104,336 |  |  | 18.9
Customer and supplier relationships | 398,778 |  |  | 151,744 |  |  | 247,034 |  |  | 11.5 |  | 393,426 |  |  | 127,462 |  |  | 265,964 |  |  | 12.2
Other intangible assets | 36,077 |  |  | 31,414 |  |  | 4,663 |  |  | 7.3 |  | 34,254 |  |  | 28,456 |  |  | 5,798 |  |  | 7.1
Total amortizable permits and other intangible assets | 609,426 |  |  | 255,946 |  |  | 353,480 |  |  | 14.2 |  | 599,317 |  |  | 223,219 |  |  | 376,098 |  |  | 13.9
Trademarks and trade names | 124,159 |  |  | — |  |  | 124,159 |  |  | Indefinite |  | 122,623 |  |  | — |  |  | 122,623 |  |  | Indefinite
Total permits and other intangible assets | $ | 733,585 |  |  | $ | 255,946 |  |  | $ | 477,639 |  |  |  |  | $ | 721,940 |  |  | $ | 223,219 |  |  | $ | 498,721 |  |  |
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 September 30, 2017 was as follows (in thousands):
Years Ending December 31, | Expected Amortization
2017 (three months) | $ | 9,039 |
2018 | 34,463 |
2019 | 31,521 |
2020 | 29,206 |
2021 | 26,747 |
Thereafter | 222,504 |
| $ | 353,480 |

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