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Revenues (Tables)
9 Months Ended
Sep. 30, 2018
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 nine months ended September 30, 2018 and 2017:
Three Months Ended
September 30, 
Nine Months Ended
September 30, 
2018201720182017
Nylon 28%  28%  28%  29%  
Caprolactam 18%  19%  18%  19%  
Ammonium Sulfate Fertilizers 19%  20%  20%  20%  
Chemical Intermediates 35%  33%  34%  32%  
100%  100%  100%  100%  
The Company's revenues by geographic area for the three and nine months ended September 30, 2018 and 2017 were as follows:
Three Months Ended
September 30, 
Nine Months Ended
September 30, 
2018201720182017
United States $306,050 $289,480 $946,195 $889,515 
International 62,603 77,180 182,155 215,290 
Total $368,653 $366,660 $1,128,350 $1,104,805 
Summary of Deferred Income and Customer Advances Below is a roll-forward of Deferred Income and Customer Advances for the nine months ended September 30, 2018:
Opening balance January 1, 2018 $17,194 
Additional cash advances 2,883 
Less amounts recognized in revenues (17,782)
Ending balance September 30, 2018 $2,295