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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] |
Summary of Changes in Quanta's Goodwill | A summary of changes in Quanta’s goodwill is as follows (in thousands):
| Electric Power Infrastructure Services Division |  | Oil and Gas Infrastructure Services Division |  | Total
Balance at December 31, 2016: |  |  |  |  |
Goodwill | $ | 1,253,979 |  |  | $ | 388,923 |  |  | $ | 1,642,902 |
Accumulated impairment | — |  |  | (39,733 | ) |  | (39,733 | )
| 1,253,979 |  |  | 349,190 |  |  | 1,603,169 |
Goodwill acquired during 2017 | 5,866 |  |  | 305,537 |  |  | 311,403 |
Purchase price allocation adjustments | (619 | ) |  | (659 | ) |  | (1,278 | )
Foreign currency translation adjustments | 14,767 |  |  | 8,984 |  |  | 23,751 |
Balance at September 30, 2017: |  |  |  |  |
Goodwill | 1,273,993 |  |  | 703,918 |  |  | 1,977,911 |
Accumulated impairment | — |  |  | (40,866 | ) |  | (40,866 | )
| $ | 1,273,993 |  |  | $ | 663,052 |  |  | $ | 1,937,045 |
Other Intangible Assets | Quanta’s intangible assets subject to amortization and the remaining weighted average amortization periods related to such assets were as follows (in thousands except for weighted average amortization periods, which are in years):
| As of |  | As of |  | As of
| September 30, 2017 |  | December 31, 2016 |  | September 30, 2017
| Intangible Assets |  | Accumulated Amortization |  | Intangible Assets, Net |  | Intangible Assets |  | Accumulated Amortization |  | Intangible Assets, Net |  | Remaining Weighted Average Amortization Period in Years
Customer relationships | $ | 328,087 |  |  | $ | (129,000 | ) |  | $ | 199,087 |  |  | $ | 244,329 |  |  | $ | (110,640 | ) |  | $ | 133,689 |  |  | 7.6
Backlog | 136,529 |  |  | (135,807 | ) |  | 722 |  |  | 133,592 |  |  | (132,441 | ) |  | 1,151 |  |  | 1.0
Trade names | 74,833 |  |  | (15,929 | ) |  | 58,904 |  |  | 54,723 |  |  | (12,855 | ) |  | 41,868 |  |  | 16.4
Non-compete agreements | 37,906 |  |  | (26,967 | ) |  | 10,939 |  |  | 29,212 |  |  | (25,546 | ) |  | 3,666 |  |  | 4.2
Patented rights and developed technology | 22,542 |  |  | (17,176 | ) |  | 5,366 |  |  | 22,480 |  |  | (15,831 | ) |  | 6,649 |  |  | 3.6
Total intangible assets subject to amortization | $ | 599,897 |  |  | $ | (324,879 | ) |  | $ | 275,018 |  |  | $ | 484,336 |  |  | $ | (297,313 | ) |  | $ | 187,023 |  |  | 9.2
Estimated Future Aggregate Amortization Expense of Intangible Assets | The estimated future aggregate amortization expense of intangible assets subject to amortization as of September 30, 2017 is set forth below (in thousands):
For the Fiscal Year Ending December 31, |  |
Remainder of 2017 | $ | 10,142 |
2018 | 39,381 |
2019 | 37,229 |
2020 | 35,824 |
2021 | 33,478 |
Thereafter | 118,964 |
Total | $ | 275,018 |

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