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Goodwill and Acquired Intangible Assets, Net (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Acquired Intangible Assets, Balance $ 121,883
Decreases:  
Acquisition
Amortization (17,388)
Foreign currency exchange rate changes (2,257)
Acquired Intangible Assets, Balance 102,238
Goodwill, Balance 665,821
Decreases:  
Acquisition
Amortization
Foreign currency exchange rate changes (19,643)
Goodwill, Balance 646,178
Total Intangible Assets, Balance 787,704
Decreases:  
Acquisition
Amortization 17,388
Foreign currency exchange rate changes (21,900)
Total Intangible Assets, Balance $ 748,416