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Segment Information (Tables)
12 Months Ended
Dec. 31, 2020
Segment Information  
Disaggregation of revenue

December 31,

    

2020

    

2019

    

2018

Revenue:

United States

$

292,107

$

287,723

$

274,391

International

 

29,217

 

30,200

 

32,860

Total

$

321,324

$

317,923

$

307,251