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Goodwill and Acquired Intangible Assets, Net (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Acquired Intangible Assets, Balance as of December 31, 2019 $ 141,847
Increases (decreases):  
Acquisition 926
Amortization (17,020)
Impairment (1,467)
Other (primarily changes in foreign currency exchange rates) (709)
Acquired Intangible Assets, Balance as of September 30, 2020 123,577
Goodwill, Balance as of December 31, 2019 743,823
Increases (decreases):  
Acquisition (474)
Impairment (104,554)
Amortization
Other (primarily changes in foreign currency exchange rates) 3,091
Goodwill, Balance as of September 30, 2020 641,886
Total Intangible Assets, Balance as of December 31, 2019 885,670
Increases (decreases):  
Acquisition 452
Amortization 17,020
Goodwill and acquired intangible assets impairment (106,021)
Other (primarily changes in foreign currency exchange rates) 2,382
Total Intangible Assets, Balance as of September 30, 2020 $ 765,463