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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Changes in Carrying Value of Goodwill | The following table represents the changes in the carrying value of goodwill for the years ended December 31, 2020 and 2019 (amounts in thousands):
Balance as of December 31, 2018 |  | $ | 326,735 |
Acquisition of C Technologies |  |  | 142,021 |
Cumulative translation adjustment |  |  | (343 | )
Balance as of December 31, 2019 |  | $ | 468,413 |
Measurement period adjustment - C Technologies |  |  | 293 |
Acquisition of EMT |  |  | 12,585 |
Acquisition of NMS |  |  | 6,784 |
Acquisition of ARTeSYN |  |  | 128,658 |
Cumulative translation adjustment |  |  | 1,572 |
Balance as of December 31, 2020 |  | $ | 618,305 |
Intangible assets | Intangible assets, net consisted of the following at December 31, 2020:
|  | December 31, 2020 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |  |  | Weighted Average Useful Life (in years) |
|  | (Amounts in thousands) |  |  |  |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Technology - developed |  | $ | 114,217 |  |  | $ | (14,444 | ) |  | $ | 99,773 |  |  |  | 17 |
Patents |  |  | 240 |  |  |  | (240 | ) |  |  | — |  |  |  | 8 |
Customer relationships |  |  | 217,790 |  |  |  | (37,333 | ) |  |  | 180,457 |  |  |  | 16 |
Trademarks |  |  | 5,893 |  |  |  | (541 | ) |  |  | 5,352 |  |  |  | 20 |
Other intangibles |  |  | 2,142 |  |  |  | (1,324 | ) |  |  | 818 |  |  |  | 3 |
Total finite-lived intangible assets |  |  | 340,282 |  |  |  | (53,882 | ) |  |  | 286,400 |  |  |  | 16 |
Indefinite-lived intangible asset: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 700 |  |  |  | — |  |  |  | 700 |  |  |  | — |
Total intangible assets |  | $ | 340,982 |  |  | $ | (53,882 | ) |  | $ | 287,100 |  |  |  |  |
Intangible assets consisted of the following at December 31, 2019:
|  | December 31, 2019 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |  |  | Weighted Average Useful Life (in years) |
|  | (Amounts in thousands) |  |  |  |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Technology - developed |  | $ | 82,169 |  |  | $ | (9,669 | ) |  | $ | 72,500 |  |  |  | 19 |
Patents |  |  | 240 |  |  |  | (240 | ) |  |  | — |  |  |  | 8 |
Customer relationships |  |  | 160,825 |  |  |  | (25,642 | ) |  |  | 135,183 |  |  |  | 15 |
Trademarks |  |  | 3,752 |  |  |  | (333 | ) |  |  | 3,419 |  |  |  | 20 |
Other intangibles |  |  | 1,697 |  |  |  | (947 | ) |  |  | 750 |  |  |  | 3 |
Total finite-lived intangible assets |  |  | 248,683 |  |  |  | (36,831 | ) |  |  | 211,852 |  |  |  | 16 |
Indefinite-lived intangible asset: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 700 |  |  |  | — |  |  |  | 700 |  |  |  | — |
Total intangible assets |  | $ | 249,383 |  |  | $ | (36,831 | ) |  | $ | 212,552 |  |  |  |  |
Schedule of Amortization Expense for Amortized Intangible Assets | Amortization expense for finite-lived intangible assets was $16.1 million, $13.6 million and $10.6 million for the years ended December 31, 2020, 2019 and 2018, respectively. As of December 31, 2020, the Company expects to record the following amortization expense (amounts in thousands):
For the Years Ended December 31, |  | Estimated Amortization Expense |
2021 |  | $ | 20,767 |
2022 |  |  | 20,765 |
2023 |  |  | 20,648 |
2024 |  |  | 20,080 |
2025 |  |  | 19,813 |
2026 and thereafter |  |  | 184,327 |
Total |  | $ | 286,400 |

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