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Intangible Assets | 3 Months Ended
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Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets |
9. | 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 were as follows (in thousands except for years):
|  | December 31, 2018 |  |  | March 31, 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 |  |  | $ | 108,454 |  |  | $ | (65,636 | ) |  | $ | 42,818 |  |  |  | 3 |
Customer relationships |  |  | 121,629 |  |  |  | (38,974 | ) |  |  | 82,655 |  |  |  | 178,729 |  |  |  | (45,839 | ) |  |  | 132,890 |  |  |  | 7 |
Leases |  |  | 670 |  |  |  | (561 | ) |  |  | 109 |  |  |  | 670 |  |  |  | (566 | ) |  |  | 104 |  |  |  | 5 |
Developed technology |  |  | 87,839 |  |  |  | (15,174 | ) |  |  | 72,665 |  |  |  | 89,139 |  |  |  | (20,736 | ) |  |  | 68,403 |  |  |  | 4 |
Trade name |  |  | 3,600 |  |  |  | (2,100 | ) |  |  | 1,500 |  |  |  | 7,400 |  |  |  | (2,992 | ) |  |  | 4,408 |  |  |  | 1 |
Non compete agreements |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 2,400 |  |  |  | (200 | ) |  |  | 2,200 |  |  |  | 2 |
Other intangibles |  |  | 275 |  |  |  | (145 | ) |  |  | 130 |  |  |  | 275 |  |  |  | (150 | ) |  |  | 125 |  |  |  | 10 |
Total intangible assets |  | $ | 294,767 |  |  | $ | (115,249 | ) |  | $ | 179,518 |  |  | $ | 387,067 |  |  | $ | (136,119 | ) |  | $ | 250,948 |  |  |  |  |
The aggregate amortization expense of intangible assets was $1.8 million and $20.9 million for the three months ended March 30, 2018 and March 31, 2019, respectively. Estimated amortization expense in each of the next five years and beyond is as follows (in thousands):
|  | March 31, 2019 |
2019 (remaining) |  | $ | 61,883 |
2020 |  |  | 72,542 |
2021 |  |  | 68,401 |
2022 |  |  | 25,808 |
2023 |  |  | 15,999 |
Thereafter |  |  | 6,315 |
Total |  | $ | 250,948 |

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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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