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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenue $ 541,077 $ 503,376
Marketing Solutions    
Disaggregation of Revenue [Line Items]    
Revenue 483,190 469,773
Retail Media    
Disaggregation of Revenue [Line Items]    
Revenue $ 57,887 $ 33,603