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Intangible Assets | 3 Months Ended
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Mar. 31, 2021
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):
|  | March 31, 2021 |  |  | December 31, 2020 |  |  | Weighted Average |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Amortization Period (in years) |
Backlog |  | $ | 147,456 |  |  | $ | (106,573 | ) |  | $ | 40,883 |  |  | $ | 145,855 |  |  | $ | (101,038 | ) |  | $ | 44,817 |  |  |  | 3 |
Customer relationships |  |  | 262,830 |  |  |  | (122,265 | ) |  |  | 140,565 |  |  |  | 264,129 |  |  |  | (110,450 | ) |  |  | 153,679 |  |  |  | 8 |
Leases |  |  | 670 |  |  |  | (604 | ) |  |  | 66 |  |  |  | 670 |  |  |  | (599 | ) |  |  | 71 |  |  |  | 5 |
Developed technology |  |  | 112,939 |  |  |  | (75,887 | ) |  |  | 37,052 |  |  |  | 112,039 |  |  |  | (68,968 | ) |  |  | 43,071 |  |  |  | 4 |
Trade name |  |  | 8,200 |  |  |  | (8,067 | ) |  |  | 133 |  |  |  | 8,200 |  |  |  | (7,967 | ) |  |  | 233 |  |  |  | 1 |
Non-compete agreements |  |  | 4,250 |  |  |  | (2,372 | ) |  |  | 1,878 |  |  |  | 4,250 |  |  |  | (2,043 | ) |  |  | 2,207 |  |  |  | 3 |
In process research and development |  |  | 1,800 |  |  |  | - |  |  |  | 1,800 |  |  |  | 1,800 |  |  |  | - |  |  |  | 1,800 |  |  | n/a |
Other intangibles |  |  | 275 |  |  |  | (201 | ) |  |  | 74 |  |  |  | 275 |  |  |  | (195 | ) |  |  | 80 |  |  |  | 10 |
Total intangible assets |  | $ | 538,420 |  |  | $ | (315,969 | ) |  | $ | 222,451 |  |  | $ | 537,218 |  |  | $ | (291,260 | ) |  | $ | 245,958 |  |  |  |  |
The aggregate amortization expense of intangible assets for the three months ended March 31, 2021 and March 31, 2020 was $24.5 million and $22.7 million, respectively. Estimated amortization expense for the remainder of the current fiscal year and in each of the next four years and beyond is as follows (in thousands):
|  | March 31, 2021 |
2021 |  | $ | 73,531 |
2022 |  |  | 51,972 |
2023 |  |  | 38,595 |
2024 |  |  | 12,273 |
2025 |  |  | 9,713 |
Thereafter |  |  | 34,567 |
Total |  | $ | 220,651 |

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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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