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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Summary of Activity of Deferred Revenue and Customer Advances
The following is a summary of the activity of the Company’s deferred revenue and customer advances for the year ended December 31, 2019, 2018 and 2017 (in thousands):
 
December 31,
 
  
2019
 
  
2018
 
  
2017
 
Balance at the beginning of the period
  $
204,257
    $
192,589
    $
173,780
 
Recognition of revenue included in balance at beginning of the period
   
(176,981
 )    
(159,258
 )    
(143,589
 )
Revenue deferred during the period, net of revenue recognized
   
186,419
     
170,926
     
162,398
 
                         
Balance at the end of the period
  $
213,695
    $
204,257
    $
192,589
 
                         
Schedule of Amount of Deferred Revenue and Customer Advances
The amount of deferred revenue and customer advances equals the transaction price allocated to unfulfilled performance obligations for the period presented. Such amounts are expected to be recognized in the future as follows (in thousands):
 
December 31, 2019
 
Deferred revenue and customer advances expected to be recognized in:
   
 
One year or less
  $
176,360
 
13-24
months
    
21,029
 
25 months and beyond
   
16,306
 
         
Total
  $
213,695