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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Percentage of sales 100.00% 100.00% 100.00% 100.00%
Sales $ 368,653 $ 366,660 $ 1,128,350 $ 1,104,805
United States [Member]        
Disaggregation of Revenue [Line Items]        
Sales 306,050 289,480 946,195 889,515
International [Member]        
Disaggregation of Revenue [Line Items]        
Sales $ 62,603 $ 77,180 $ 182,155 $ 215,290
Nylon [Member]        
Disaggregation of Revenue [Line Items]        
Percentage of sales 28.00% 28.00% 28.00% 29.00%
Caprolactam [Member]        
Disaggregation of Revenue [Line Items]        
Percentage of sales 18.00% 19.00% 18.00% 19.00%
Ammonium Sulfate Fertilizers [Member]        
Disaggregation of Revenue [Line Items]        
Percentage of sales 19.00% 20.00% 20.00% 20.00%
Chemical Intermediates [Member]        
Disaggregation of Revenue [Line Items]        
Percentage of sales 35.00% 33.00% 34.00% 32.00%