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Goodwill and Acquired Intangible Assets, Net (Tables) | 3 Months Ended
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Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | A summary of acquired intangible assets and goodwill activity for the three months ended March 31, 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 |
Decreases: |  |  |  |  |  |
Acquisition |  | — |  |  | (474 | ) |  | (474 | )
Amortization |  | (5,726 | ) |  | — |  |  | (5,726 | )
Other (primarily changes in foreign currency exchange rates) |  | (5,944 | ) |  | (28,850 | ) |  | (34,794 | )
Balance as of March 31, 2020 |  | $ | 130,177 |  |  | $ | 714,499 |  |  | $ | 844,676 |

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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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