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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure | Goodwill and Intangible Assets The following table presents the Company’s goodwill as reported on the Consolidated Balance Sheets as of December 31,:
| Integrated Agencies Network |  | Brand Performance Network |  | Communications Network |  | All Other |  | Total
Balance at December 31, 2021 | $ | 1,153,073 |  |  | $ | 358,613 |  |  | $ | 115,777 |  |  | $ | 25,260 |  |  | $ | 1,652,723 |
Acquired goodwill | 3,330 |  |  | 26,176 |  |  | 6,569 |  |  | 29,387 |  |  | 65,462 |
Impairment | (49,840) |  |  | (49,314) |  |  | — |  |  | (17,560) |  |  | (116,714) |
Transfer of goodwill between segments (1) | (111,065) |  |  | 111,065 |  |  | — |  |  | — |  |  | — |
Foreign currency translation | (11,422) |  |  | (13,467) |  |  | (753) |  |  | — |  |  | (25,642) |
Other (2) | (15,682) |  |  | 685 |  |  | 6,124 |  |  | — |  |  | (8,873) |
Balance at December 31, 2022 | $ | 968,394 |  |  | $ | 433,758 |  |  | $ | 127,717 |  |  | $ | 37,087 |  |  | $ | 1,566,956 |
Acquired goodwill | 18,451 |  |  | 2,626 |  |  | — |  |  | — |  |  | 21,077 |
Disposition | (98,779) |  |  | — |  |  | — |  |  | — |  |  | (98,779) |
Transfer of goodwill between segments (1) | (8,517) |  |  | — |  |  | 8,517 |  |  | — |  |  | — |
Foreign currency translation | 1,846 |  |  | 5,056 |  |  | 353 |  |  | 271 |  |  | 7,526 |
Other (2) | — |  |  | 220 |  |  | — |  |  | 1,815 |  |  | 2,035 |
Balance at December 31, 2023 | $ | 881,395 |  |  | $ | 441,660 |  |  | $ | 136,587 |  |  | $ | 39,173 |  |  | $ | 1,498,815 |
Acquired goodwill | 13,845 |  |  | 368 |  |  | 23,520 |  |  | 38,175 |  |  | 75,908 |
Disposition | — |  |  | — |  |  | — |  |  | (7,699) |  |  | (7,699) |
Transfer of goodwill between segments (1) | 4,122 |  |  | (4,122) |  |  | — |  |  | — |  |  | — |
Foreign currency translation | (6,485) |  |  | (4,149) |  |  | (784) |  |  | (738) |  |  | (12,156) |
Other (2) | (731) |  |  | 9 |  |  | — |  |  | — |  |  | (722) |
Balance at December 31, 2024 | $ | 892,146 |  |  | $ | 433,766 |  |  | $ | 159,323 |  |  | $ | 68,911 |  |  | $ | 1,554,146 |
(1) Transfer of goodwill resulting from changes to the Company’s reportable segments (Networks) due to changes in the Company’s internal management and reporting structure. See Note 20 of the Notes included herein for additional information related to these changes. (2) Represents adjustments associated with the finalization of purchase price accounting for acquisitions. There was $116.7 million of accumulated goodwill impairment charges as of December 31, 2023, and December 31, 2024. The Company recognized an impairment and other losses charge of $122.2 million for the year ended December 31, 2022, primarily related to the impairment of goodwill totaling $116.7 million. The goodwill impairment was to write down the carrying value in excess of the fair value at eight reporting units, three in the Integrated Agencies Network, four in the Brand Performance Network and one within the All Other category. The charge was recorded within Impairment and other losses on the Consolidated Statements of Operations. The following presents the Company’s gross and net amounts of intangible assets other than goodwill as reported on the Consolidated Balance Sheets as of December 31,:
Intangible Assets |  | 2024 |  | 2023
Customer relationships, gross |  | $ | 939,227 |  |  | $ | 870,987 |
Accumulated amortization |  | (293,581) |  |  | (218,808) |
Customer relationships, net |  | $ | 645,646 |  |  | $ | 652,179 |
Trade names, gross |  | $ | 208,549 |  |  | $ | 188,820 |
Accumulated amortization |  | (94,687) |  |  | (74,141) |
Trade names, net |  | $ | 113,862 |  |  | $ | 114,679 |
Capitalized software, gross |  | $ | 104,017 |  |  | $ | 70,622 |
Accumulated amortization |  | (49,597) |  |  | (30,928) |
Capitalized software, net |  | $ | 54,420 |  |  | $ | 39,694 |
Developed technology and other, gross |  | $ | 37,890 |  |  | $ | 21,583 |
Accumulated amortization |  | (15,035) |  |  | (9,915) |
Developed technology and other, net |  | $ | 22,855 |  |  | $ | 11,668 |
Total intangible assets, gross |  | $ | 1,289,683 |  |  | $ | 1,152,012 |
Accumulated amortization |  | (452,900) |  |  | (333,792) |
Total intangible assets, net |  | $ | 836,783 |  |  | $ | 818,220 |
The weighted average amortization period for customer relationships is thirteen years, trade names is twelve years, capitalized software is four years, and developed technology and other intangible assets is two years. In total, the weighted average amortization period is thirteen years. Amortization expense related to amortizable intangible assets for the years ended December 31, 2024, 2023, and 2022 was $121.6 million, $112.2 million, and $103.1 million, respectively. The estimated amortization expense for the five succeeding years is as follows:
Year |  | Amortization
2025 |  | $ | 119,386 |
2026 |  | 117,048 |
2027 |  | 102,092 |
2028 |  | 87,055 |
2029 |  | 75,999 |
Thereafter |  | 335,203 |
Total |  | $ | 836,783 |

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