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Goodwill and Acquired Intangible Assets, Net (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Acquired Intangible Assets, Balance $ 121,883
Decreases:  
Acquisition
Amortization 11,600
Foreign currency exchange rate changes (963)
Acquired Intangible Assets, Balance 109,320
Goodwill, Balance 665,821
Decreases:  
Acquisition
Amortization
Foreign currency exchange rate changes (8,494)
Goodwill, Balance 657,327
Total Intangible Assets, Balance 787,704
Decreases:  
Acquisition
Amortization (11,600)
Foreign currency exchange rate changes (9,457)
Total Intangible Assets, Balance $ 766,647