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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 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, 2013 |  | $ | 1,168,084 |  |  | $ | 277,843 |  |  | $ | 334,790 |  |  | $ | 1,780,717 |
Goodwill acquired during 2014 |  |  | 50,788 |  |  |  | 7,556 |  |  |  | — |  |  |  | 58,344 |
Foreign currency translation related to goodwill |  |  | 1,111 |  |  |  | 2,817 |  |  |  | — |  |  |  | 3,928 |
Goodwill balance at June 30, 2014 |  | $ | 1,219,983 |  |  | $ | 288,216 |  |  | $ | 334,790 |  |  | $ | 1,842,989 |
Other Intangible Assets | Activity in Quanta’s intangible assets consisted of the following (in thousands):
|  | As of December 31, 2013 |  |  | Six Months Ended June 30, 2014 |  |  | As of June 30, 2014 |
|  | Intangible Assets |  |  | Accumulated Amortization |  |  | Amortization Expense |  |  | Additions |  |  | Foreign Currency Adjustments |  |  | Intangible Assets, Net |  |  | Remaining Weighted Average Amortization Period in Years |
Customer relationships |  | $ | 199,224 |  |  | $ | (59,417 | ) |  | $ | (7,413 | ) |  | $ | 13,322 |  |  | $ | 402 |  |  | $ | 146,118 |  |  |  | 10.4 |
Backlog |  |  | 136,831 |  |  |  | (127,233 | ) |  |  | (6,134 | ) |  |  | 5,855 |  |  |  | 65 |  |  |  | 9,384 |  |  |  | 0.9 |
Trade names |  |  | 40,342 |  |  |  | (4,228 | ) |  |  | (957 | ) |  |  | 2,044 |  |  |  | 172 |  |  |  | 37,373 |  |  |  | 22.5 |
Non-compete agreements |  |  | 28,895 |  |  |  | (22,861 | ) |  |  | (1,315 | ) |  |  | 743 |  |  |  | 6 |  |  |  | 5,468 |  |  |  | 3.1 |
Patented rights and developed technology |  |  | 21,440 |  |  |  | (9,616 | ) |  |  | (1,041 | ) |  |  | 404 |  |  |  | 9 |  |  |  | 11,196 |  |  |  | 4.9 |
Total intangible assets subject to amortization |  |  | 426,732 |  |  |  | (223,355 | ) |  |  | (16,860 | ) |  |  | 22,368 |  |  |  | 654 |  |  |  | 209,539 |  |  |  | 11.7 |
Other intangible assets not subject to amortization |  |  | 4,500 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,500 |  |  |  | N/A |
Total intangible assets |  | $ | 431,232 |  |  | $ | (223,355 | ) |  | $ | (16,860 | ) |  | $ | 22,368 |  |  | $ | 654 |  |  | $ | 214,039 |  |  |  | N/A |
Estimated Future Aggregate Amortization Expense of Intangible Assets | The estimated future aggregate amortization expense of intangible assets as of June 30, 2014 is set forth below (in thousands):
For the Fiscal Year Ending December 31, |  |  |  |
Remainder of 2014 |  | $ | 16,937 |
2015 |  |  | 22,160 |
2016 |  |  | 20,729 |
2017 |  |  | 19,257 |
2018 |  |  | 18,980 |
Thereafter |  |  | 111,476 |
Total |  | $ | 209,539 |

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