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Revenues Revenues (Tables)
3 Months Ended
Mar. 31, 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 months ended March 31, 2018 and 2017:
 
Three Months Ended
March 31,
 
2018
 
2017
Nylon
28%
 
29%
Caprolactam
18%
 
21%
Ammonium Sulfate Fertilizers
19%
 
18%
Chemical Intermediates
35%
 
32%

The Company's revenues by geographic area for the three months ended March 31, 2018 and 2017 were as follows:
 
Three Months Ended
March 31,
 
2018
2017
United States
$
297,648

$
300,049

International
61,590
 
76,655
 
Total
$
359,238

$
376,704

Summary of Deferred Income and Customer Advances
Below is a roll-forward of Deferred Income and Customer Advances for the three months ended March 31, 2018:
Opening balance January 1, 2018
$
17,194

Additional cash advances                
2,107

Less amounts recognized in revenues
(2,175
)
Ending balance March 31, 2018
$
17,126