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Revenues (Tables)
6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Each of the Company’s product lines represented the following approximate percentage of total sales for the three and six months ended June 30, 2019 and 2018:
Three Months Ended
June 30,
Six Months Ended
June 30,
2019201820192018
Nylon27%  27%  29%  28%  
Caprolactam20%  19%  20%  18%  
Ammonium Sulfate Fertilizers27%  21%  25%  20%  
Chemical Intermediates26%  33%  26%  34%  
100%  100%  100%  100%  

The Company's revenues by geographic area for the three and six months ended June 30, 2019 and 2018 were as follows:
Three Months Ended
June 30,
Six Months Ended
June 30,
2019201820192018
United States$289,551 $342,497 $547,193 $640,145 
International55,664 57,962 112,917 119,552 
Total$345,215 $400,459 $660,110 $759,697 
Summary of Deferred Income and Customer Advances Below is a roll-forward of Deferred income and customer advances for the six months ended June 30, 2019:
Opening balance January 1, 2019$22,556 
Additional cash advances1,083 
Less amounts recognized in revenues(20,455)
Ending balance June 30, 2019$3,184