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Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets |
8. | Intangible Assets
The gross amount and accumulated amortization of acquired identifiable intangible assets included in “Intangible assets, net” on the consolidated balance sheets were as follows (in thousands except for years):
|  | December 31, 2020 |  |  | December 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 |  | $ | 145,855 |  |  | $ | (101,038 | ) |  | $ | 44,817 |  |  | $ | 109,255 |  |  | $ | (87,510 | ) |  | $ | 21,745 |  |  |  | 3 |
Customer relationships |  |  | 264,129 |  |  |  | (110,450 | ) |  |  | 153,679 |  |  |  | 228,529 |  |  |  | (67,809 | ) |  |  | 160,720 |  |  |  | 8 |
Leases |  |  | 670 |  |  |  | (599 | ) |  |  | 71 |  |  |  | 670 |  |  |  | (580 | ) |  |  | 90 |  |  |  | 5 |
Developed technology |  |  | 112,039 |  |  |  | (68,968 | ) |  |  | 43,071 |  |  |  | 110,939 |  |  |  | (40,749 | ) |  |  | 70,190 |  |  |  | 4 |
Trade name |  |  | 8,200 |  |  |  | (7,967 | ) |  |  | 233 |  |  |  | 8,200 |  |  |  | (5,667 | ) |  |  | 2,533 |  |  |  | 1 |
Non-compete agreements |  |  | 4,250 |  |  |  | (2,043 | ) |  |  | 2,207 |  |  |  | 3,600 |  |  |  | (925 | ) |  |  | 2,675 |  |  |  | 3 |
In process research and development |  |  | 1,800 |  |  |  | - |  |  |  | 1,800 |  |  |  | 1,800 |  |  |  | - |  |  |  | 1,800 |  |  | n/a |
Other intangibles |  |  | 275 |  |  |  | (195 | ) |  |  | 80 |  |  |  | 275 |  |  |  | (170 | ) |  |  | 105 |  |  |  | 10 |
Total intangible assets |  | $ | 537,218 |  |  | $ | (291,260 | ) |  | $ | 245,958 |  |  | $ | 463,268 |  |  | $ | (203,410 | ) |  | $ | 259,858 |  |  |  |  |
The aggregate amortization expense of intangible assets was $87.8 million, $88.3 million, and $37.4 million for the years ended December 31, 2020, December 31, 2019 and December 31, 2018, respectively. Estimated amortization expense in each of the next five years and beyond is as follows (in thousands):
|  | December 31, 2020 |
2021 |  | $ | 97,178 |
2022 |  |  | 51,668 |
2023 |  |  | 38,081 |
2024 |  |  | 12,248 |
2025 |  |  | 9,688 |
Thereafter |  |  | 35,295 |
Total |  | $ | 244,158 |

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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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