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Goodwill and Acquired Intangible Assets, Net (Tables) | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of acquired intangible assets and goodwill activity | A summary of acquired intangible assets and goodwill activity for the nine months ended September 30, 2020 is presented below:
(in thousands) |  | Acquired Intangible Assets |  | Goodwill |  | Total Intangible Assets
Balance as of December 31, 2019 |  | $ | 141,847 |  |  | $ | 743,823 |  |  | $ | 885,670 |
Increases (decreases): |  |  |  |  |  |
Acquisition |  | 926 |  |  | (474 | ) |  | 452 |
Amortization |  | (17,020 | ) |  | — |  |  | (17,020 | )
Impairment |  | (1,467 | ) |  | (104,554 | ) |  | (106,021 | )
Other (primarily changes in foreign currency exchange rates) |  | (709 | ) |  | 3,091 |  |  | 2,382 |
Balance as of September 30, 2020 |  | $ | 123,577 |  |  | $ | 641,886 |  |  | $ | 765,463 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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