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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Revenues $ 359,238 $ 376,704
United States [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 297,648 300,049
International [Member]    
Disaggregation of Revenue [Line Items]    
Revenues $ 61,590 $ 76,655
Nylon [Member]    
Disaggregation of Revenue [Line Items]    
Percentage of sales 28.00% 29.00%
Caprolactam [Member]    
Disaggregation of Revenue [Line Items]    
Percentage of sales 18.00% 21.00%
Ammonium Sulfate Fertilizers [Member]    
Disaggregation of Revenue [Line Items]    
Percentage of sales 19.00% 18.00%
Chemical Intermediates [Member]    
Disaggregation of Revenue [Line Items]    
Percentage of sales 35.00% 32.00%