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Segments and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Summary Of Revenue And Operating Income The Company and its chief operating decision maker evaluate performance based on revenues and operating income.
 
(in thousands)
  
Sales
   
Marketing
   
Total
 
Year Ended December 31, 2020
               
Revenues
  $2,060,593   $1,095,078   $3,155,671 
Depreciation and amortization
  $171,569   $67,029   $238,598 
Operating income
  $63,305   $3,701   $67,006 
Year Ended December 31, 2019
               
Revenues
  $1,954,705   $1,830,358   $3,785,063 
Depreciation and amortization
  $161,563   $71,010   $232,573 
Operating income
  $127,961   $85,713   $213,674 
Year Ended December 31, 2018
               
Revenues
  $1,857,004   $1,850,624   $3,707,628 
Depreciation and amortization
  $157,098   $68,135   $225,233 
Operating loss
  $(1,072,702  $(17,212  $(1,089,914
Summary of Revenues and Long-lived Assets by Services Provided in Geographic Region
Revenues and long-lived assets by services provided in geographic region are as follows:
 
   
Year Ended December 31,
 
(in thousands)
  
2020
   
2019
   
2018
 
Revenues
               
North America
  $2,791,282   $3,324,019   $3,257,937 
International
   363,433    461,044    449,691 
   
 
 
   
 
 
   
 
 
 
Total revenues
  $3,154,715   $3,785,063   $3,707,628 
   
 
 
   
 
 
   
 
 
 
 
   
December 31,
 
(in thousands)
  
2020
   
2019
 
Long-Lived Assets
          
North America
  $72,722   $107,940 
International
   7,294    6,750 
   
 
 
   
 
 
 
Total long-lived assets
  $80,016   $114,690