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Goodwill and Acquired Intangible Assets, Net (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Acquired Intangible Assets, Balance $ 121,883
Decreases:  
Acquisition
Amortization (5,789)
Other (primarily changes in foreign currency exchange rates) (1,326)
Acquired Intangible Assets, Balance 114,768
Goodwill, Balance 665,821
Decreases:  
Acquisition
Amortization
Other (primarily changes in foreign currency exchange rates) (12,693)
Goodwill, Balance 653,128
Total Intangible Assets, Balance 787,704
Decreases:  
Acquisition
Amortization (5,789)
Other (primarily changes in foreign currency exchange rates) (14,019)
Total Intangible Assets, Balance $ 767,896