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Goodwill and Other Intangible Assets, Net (Tables) | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of changes in carrying amount of goodwill | The changes in the carrying amount of goodwill were as follows (in thousands):
Balance, January 1, 2020 | $ | 557,914 |
Acquisitions | 6,294 |
Measurement period adjustments | (3,876) |
Balance, December 31, 2020 | 560,332 |
Acquisitions | 33,014 |
Measurement period adjustments | (52) |
Balance, March 31, 2021 | $ | 593,294 |
Schedule of components of other intangible assets | Other intangible assets consisted of the following (in thousands, except weighted-average life):
| March 31, 2021
| Gross Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Weighted- Average Remaining Life (Years)
Indefinite life: |  |  |  |  |  |  |
Trademark and trade names | $ | 11,350 |  |  | $ | — |  |  | $ | 11,350 |  |  | N/A
License agreements (GSE) | 5,390 |  |  | — |  |  | 5,390 |  |  | N/A
Definite life: |  |  |  |  |  |  |
Trademark and trade names | 8,774 |  |  | (4,687) |  |  | 4,087 |  |  | 3.1
Non-contractual customers | 30,131 |  |  | (10,634) |  |  | 19,497 |  |  | 9.7
License agreements | 4,981 |  |  | (4,510) |  |  | 471 |  |  | 0.5
Non-compete agreements | 6,557 |  |  | (3,165) |  |  | 3,392 |  |  | 4.1
Contractual customers | 15,022 |  |  | (1,686) |  |  | 13,336 |  |  | 6.4
Other | 5,302 |  |  | (1,317) |  |  | 3,985 |  |  | 5.4
Total | $ | 87,507 |  |  | $ | (25,999) |  |  | $ | 61,508 |  |  | 7.2
| December 31, 2020
| Gross Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Weighted- Average Remaining Life (Years)
Indefinite life: |  |  |  |  |  |  |
Trademark and trade names | $ | 11,350 |  |  | $ | — |  |  | $ | 11,350 |  |  | N/A
License agreements (GSE) | 5,390 |  |  | — |  |  | 5,390 |  |  | N/A
Definite life: |  |  |  |  |  |  |
Trademark and trade names | 5,704 |  |  | (4,519) |  |  | 1,185 |  |  | 0.1
Non-contractual customers | 30,131 |  |  | (9,729) |  |  | 20,402 |  |  | 7.2
License agreements | 4,981 |  |  | (4,266) |  |  | 715 |  |  | 0.0
Non-compete agreements | 6,557 |  |  | (2,920) |  |  | 3,637 |  |  | 0.6
Contractual customers | 3,052 |  |  | (1,584) |  |  | 1,468 |  |  | 0.4
Other | 350 |  |  | (208) |  |  | 142 |  |  | 0.0
Total | $ | 67,515 |  |  | $ | (23,226) |  |  | $ | 44,289 |  |  | 5.5
Summary of estimated future amortization expense of definite life intangible assets | The estimated future amortization of definite life intangible assets as of March 31, 2021 was as follows (in thousands):
2021 | $ | 6,358 |
2022 | 6,769 |
2023 | 6,409 |
2024 | 5,855 |
2025 | 4,820 |
Thereafter | 14,557 |
Total | $ | 44,768 |

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