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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2014
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 Division |  |  | Oil and Gas Infrastructure Division |  |  | Fiber Optic Licensing Division |  |  | Total |
Goodwill balance at December 31, 2012 |  | $ | 1,065,152 |  |  | $ | 137,703 |  |  | $ | 334,790 |  |  | $ | 1,537,645 |
Goodwill acquired during 2013 |  |  | 112,549 |  |  |  | 143,257 |  |  |  | — |  |  |  | 255,806 |
Foreign currency translation adjustment related to goodwill |  |  | (9,617 | ) |  |  | (3,117 | ) |  |  | — |  |  |  | (12,734 | )
Goodwill balance at December 31, 2013 |  |  | 1,168,084 |  |  |  | 277,843 |  |  |  | 334,790 |  |  |  | 1,780,717 |
Goodwill acquired during 2014 |  |  | 71,517 |  |  |  | 102,968 |  |  |  | — |  |  |  | 174,485 |
Foreign currency translation adjustment related to goodwill |  |  | (16,377 | ) |  |  | (7,340 | ) |  |  | — |  |  |  | (23,717 | )
Goodwill balance at December 31, 2014 |  | $ | 1,223,224 |  |  | $ | 373,471 |  |  | $ | 334,790 |  |  | $ | 1,931,485 |
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 December 31, 2014 |  |  | As of December 31, 2013 |  |  | As of December 31, 2014 |
|  | Intangible Assets |  |  | Accumulated Amortization |  |  | Intangible Assets, Net |  |  | Intangible Assets |  |  | Accumulated Amortization |  |  | Intangible Assets, Net |  |  | Remaining Weighted Average Amortization Period in Years |
Customer relationships |  | $ | 257,380 |  |  | $ | (74,289 | ) |  | $ | 183,091 |  |  | $ | 199,224 |  |  | $ | (59,417 | ) |  | $ | 139,807 |  |  |  | 10.2 |
Backlog |  |  | 151,404 |  |  |  | (138,460 | ) |  |  | 12,944 |  |  |  | 136,831 |  |  |  | (127,233 | ) |  |  | 9,598 |  |  |  | 1.3 |
Trade names |  |  | 49,664 |  |  |  | (6,278 | ) |  |  | 43,386 |  |  |  | 40,342 |  |  |  | (4,228 | ) |  |  | 36,114 |  |  |  | 20.0 |
Non-compete agreements |  |  | 31,430 |  |  |  | (25,136 | ) |  |  | 6,294 |  |  |  | 28,895 |  |  |  | (22,860 | ) |  |  | 6,035 |  |  |  | 3.4 |
Patented rights and developed technology |  |  | 22,073 |  |  |  | (11,695 | ) |  |  | 10,378 |  |  |  | 21,440 |  |  |  | (9,617 | ) |  |  | 11,823 |  |  |  | 4.6 |
Total intangible assets subject to amortization |  | $ | 511,951 |  |  | $ | (255,858 | ) |  | $ | 256,093 |  |  | $ | 426,732 |  |  | $ | (223,355 | ) |  | $ | 203,377 |  |  |  | 11.0 |
Estimated Future Aggregate Amortization Expense of Intangible Assets | The estimated future aggregate amortization expense of intangible assets as of December 31, 2014 is set forth below (in thousands):
For the Fiscal Year Ending December 31, |  |  |  |
2015 |  | $ | 34,823 |
2016 |  |  | 28,430 |
2017 |  |  | 24,553 |
2018 |  |  | 24,277 |
2019 |  |  | 23,508 |
Thereafter |  |  | 120,502 |
Total |  | $ | 256,093 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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