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Goodwill and Acquired Intangible Assets, Net (Tables) | 6 Months Ended
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Jun. 30, 2019
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 six months ended June 30, 2019 is presented below:
(in thousands) |  | Acquired Intangible Assets |  | Goodwill |  | Total Intangible Assets
Balance as of December 31, 2018 |  | $ | 114,485 |  |  | $ | 704,197 |  |  | $ | 818,682 |
Increases (decreases): |  |  |  |  |  |
Acquisition |  | — |  |  | 686 |  |  | 686 |
Amortization |  | (10,303 | ) |  | — |  |  | (10,303 | )
Other (primarily changes in foreign currency exchange rates) |  | 192 |  |  | 1,484 |  |  | 1,676 |
Balance as of June 30, 2019 |  | $ | 104,374 |  |  | $ | 706,367 |  |  | $ | 810,741 |

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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=108376223&loc=d3e13816-109267 + Details
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