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Permit and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | The following table summarizes changes in the carrying amount of permits. No permit exists at our Services and Medical Segments.
Permit (amount in thousands) |  | Treatment |
Balance as of December 31, 2016 |  | $ | 8,474 |
PCB permit amortized (1) |  |  | (55 | )
Balance as of December 31, 2017 |  |  | 8,419 |
PCB permit amortized (1) |  |  | (55 | )
Permit in progress |  |  | 79 |
Balance as of December 31, 2018 |  | $ | 8,443 |
(1) Amortization for the one definite-lived permit capitalized in 2009. This permit is being amortized over a ten year period in accordance with its estimated useful life. See net carrying value of this permit at December 31, 2018 and 2017 in the table below.
Schedule of Finite-Lived Intangible Assets | The following table summarizes information relating to the Company’s definite-lived intangible assets:
|  |  |  |  | December 31, 2018 |  |  | December 31, 2017 |
Intangibles (amount in thousands) |  | Useful Lives (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Patent |  |  | 1-17 |  |  | $ | 728 |  |  | $ | (336 | ) |  | $ | 392 |  |  | $ | 657 |  |  | $ | (306 | ) |  | $ | 351 |
Software |  |  | 3 |  |  |  | 410 |  |  |  | (403 | ) |  |  | 7 |  |  |  | 410 |  |  |  | (398 | ) |  |  | 12 |
Customer relationships |  |  | 10 |  |  |  | 3,370 |  |  |  | (2,491 | ) |  |  | 879 |  |  |  | 3,370 |  |  |  | (2,246 | ) |  |  | 1,124 |
Permit |  |  | 10 |  |  |  | 545 |  |  |  | (538 | ) |  |  | 7 |  |  |  | 545 |  |  |  | (483 | ) |  |  | 62 |
Total |  |  |  |  |  | $ | 5,053 |  |  | $ | (3,768 | ) |  | $ | 1,285 |  |  | $ | 4,982 |  |  | $ | (3,433 | ) |  | $ | 1,549 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The following table summarizes the expected amortization over the next five years for our definite-lived intangible assets:
|  |  | Amount |
Year |  |  | (In thousands) |
2019 |  |  | $ | 255 |
2020 |  |  |  | 219 |
2021 |  |  |  | 198 |
2022 |  |  |  | 172 |
2023 |  |  |  | 132 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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