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Intangible Assets | 9 Months Ended
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Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets |
8. | Intangible Assets
The gross amount and accumulated amortization of intangible assets with finite useful lives included in “Intangible assets, net” on the consolidated balance sheets are as follows (in thousands except for years):
|  | December 31, 2018 |  |  | September 30, 2019 |  |  | Weighted Average |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Amortization Period (in years) |
Backlog |  | $ | 80,754 |  |  | $ | (58,295 | ) |  | $ | 22,459 |  |  | $ | 109,155 |  |  | $ | (80,321 | ) |  | $ | 28,834 |  |  |  | 3 |
Customer relationships |  |  | 121,629 |  |  |  | (38,974 | ) |  |  | 82,655 |  |  |  | 226,329 |  |  |  | (60,266 | ) |  |  | 166,063 |  |  |  | 7 |
Leases |  |  | 670 |  |  |  | (561 | ) |  |  | 109 |  |  |  | 670 |  |  |  | (576 | ) |  |  | 94 |  |  |  | 5 |
Developed technology |  |  | 87,839 |  |  |  | (15,174 | ) |  |  | 72,665 |  |  |  | 111,739 |  |  |  | (32,545 | ) |  |  | 79,194 |  |  |  | 4 |
Trade name |  |  | 3,600 |  |  |  | (2,100 | ) |  |  | 1,500 |  |  |  | 8,200 |  |  |  | (5,092 | ) |  |  | 3,108 |  |  |  | 1 |
Non-compete agreements |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 3,600 |  |  |  | (650 | ) |  |  | 2,950 |  |  |  | 3 |
Other intangibles |  |  | 275 |  |  |  | (145 | ) |  |  | 130 |  |  |  | 1,076 |  |  |  | (162 | ) |  |  | 914 |  |  |  | 10 |
Total intangible assets |  | $ | 294,767 |  |  | $ | (115,249 | ) |  | $ | 179,518 |  |  | $ | 460,769 |  |  | $ | (179,612 | ) |  | $ | 281,157 |  |  |  |  |
The aggregate amortization expense of intangible assets for the three months ended September 28, 2018 and September 30, 2019 was $14.8 million and $22.1 million, respectively, and for the nine months ended September 30, 2018 and September 30, 2019 was $22.7 million and $64.5 million, respectively. Estimated amortization expense in each of the next five years and beyond is as follows (in thousands):
|  | September 30, 2019 |
2019 (remaining) |  | $ | 23,049 |
2020 |  |  | 83,511 |
2021 |  |  | 78,778 |
2022 |  |  | 34,517 |
2023 |  |  | 22,599 |
Thereafter |  |  | 38,703 |
Total |  | $ | 281,157 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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