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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2013
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 |  |  | Natural Gas and Pipeline 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 |  |  | 1,052 |  |  |  | — |  |  |  | — |  |  |  | 1,052 |
Foreign currency translation related to goodwill |  |  | (7,490 | ) |  |  | (1,069 | ) |  |  | — |  |  |  | (8,559 | )
Goodwill balance at June 30, 2013 |  | $ | 1,058,714 |  |  | $ | 136,634 |  |  | $ | 334,790 |  |  | $ | 1,530,138 |
Other Intangible Assets | Activity in Quanta’s intangible assets consists of the following (in thousands):
|  | As of December 31, 2012 |  |  | Six Months Ended June 30, 2013 |  |  | As of June 30, 2013 |
|  | Intangible Assets |  |  | Accumulated Amortization |  |  | Amortization Expense |  |  | Additions |  |  | Foreign Currency Adjustments |  |  | Intangible Assets, Net |  |  | Remaining Weighted Average Amortization Period in Years |
Customer relationships |  | $ | 170,465 |  |  | $ | (47,777 | ) |  | $ | (5,601 | ) |  | $ | 483 |  |  | $ | (1,891 | ) |  | $ | 115,679 |  |  |  | 10.7 |
Backlog |  |  | 126,057 |  |  |  | (119,068 | ) |  |  | (1,999 | ) |  |  | 393 |  |  |  | (23 | ) |  |  | 5,360 |  |  |  | 2.1 |
Trade names |  |  | 32,559 |  |  |  | (3,014 | ) |  |  | (541 | ) |  |  | — |  |  |  | (317 | ) |  |  | 28,687 |  |  |  | 26.7 |
Non-compete agreements |  |  | 27,406 |  |  |  | (20,706 | ) |  |  | (1,173 | ) |  |  | 44 |  |  |  | (199 | ) |  |  | 5,372 |  |  |  | 2.8 |
Patented rights and developed technology |  |  | 20,931 |  |  |  | (7,517 | ) |  |  | (1,066 | ) |  |  | — |  |  |  | (75 | ) |  |  | 12,273 |  |  |  | 6.5 |
Total intangible assets subject to amortization |  |  | 377,418 |  |  |  | (198,082 | ) |  |  | (10,380 | ) |  |  | 920 |  |  |  | (2,505 | ) |  |  | 167,371 |  |  |  | 12.6 |
Other intangible assets not subject to amortization |  |  | 4,500 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,500 |  |  |  | N/A |
Total intangible assets |  | $ | 381,918 |  |  | $ | (198,082 | ) |  | $ | (10,380 | ) |  | $ | 920 |  |  | $ | (2,505 | ) |  | $ | 171,871 |  |  |  | N/A |
Estimated Future Aggregate Amortization Expense of Intangible Assets | The estimated future aggregate amortization expense of intangible assets as of June 30, 2013 is set forth below (in thousands):
For the Fiscal Year Ending December 31 — |  |  |  |
Remainder of 2013 |  | $ | 9,992 |
2014 |  |  | 18,209 |
2015 |  |  | 15,813 |
2016 |  |  | 14,970 |
2017 |  |  | 14,004 |
Thereafter |  |  | 94,383 |
Total |  | $ | 167,371 |

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