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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets The changes in the carrying amount of goodwill for the years ended December 31, 2020 and 2019 are as follows:
Balance, December 31, 2018 | $ | 446,318 |
Acquisitions | 34,041 |
Foreign currency translation adjustments | (321) |
Other adjustments | 27 |
Balance, December 31, 2019 | 480,065 |
Acquisitions | 81,990 |
Foreign currency translation adjustments | 19,195 |
Other adjustments | (76) |
Balance, December 31, 2020 | $ | 581,174 |
Details of intangible assets other than goodwill as of December 31, 2020 and 2019 are as follows:
|  |  | December 31, 2020 |  | December 31, 2019
| Estimated Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Software and technology | 3 years |  | $ | 67,691 |  |  | $ | (63,046) |  |  | $ | 4,645 |  |  | $ | 66,063 |  |  | $ | (58,866) |  |  | $ | 7,197 |
Customer relationships | 3-10 years |  | 97,008 |  |  | (66,030) |  |  | 30,978 |  |  | 88,904 |  |  | (59,744) |  |  | 29,160 |
Trademarks | 3-10 years |  | 26,610 |  |  | (16,888) |  |  | 9,722 |  |  | 22,278 |  |  | (12,461) |  |  | 9,817 |
Non-compete agreements | 5 years |  | 350 |  |  | (68) |  |  | 282 |  |  | 150 |  |  | (11) |  |  | 139 |
Total intangible assets |  |  | $ | 191,659 |  |  | $ | (146,032) |  |  | $ | 45,627 |  |  | $ | 177,395 |  |  | $ | (131,082) |  |  | $ | 46,313 |
The aggregate amortization expense for purchased intangible assets with finite lives recorded for the years ended December 31, 2020, 2019, and 2018 was reflected in our consolidated statements of operations as follows:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Cost of subscriptions and licenses | $ | 4,981 |  |  | $ | 3,795 |  |  | $ | 2,840 |
Amortization of purchased intangibles | 15,352 |  |  | 14,213 |  |  | 14,000 |
Total amortization expense | $ | 20,333 |  |  | $ | 18,008 |  |  | $ | 16,840 |
Amortization expense for the years following December 31, 2020 are estimated as follows:
2021 | $ | 16,088 |
2022 | 12,975 |
2023 | 6,609 |
2024 | 3,316 |
2025 | 2,559 |
Thereafter | 4,080 |
| $ | 45,627 |

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- Definition The entire disclosure for goodwill and 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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