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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Liability, revenue recognized $ 5,800    
Contract receivables 259,015   $ 197,739
Contract liabilities 13,343   $ 13,906
Polymer      
Disaggregation of Revenue [Line Items]      
Revenue 261,055 $ 289,071  
Polymer | Performance Products      
Disaggregation of Revenue [Line Items]      
Revenue 138,092 145,730  
Polymer | Specialty Polymers      
Disaggregation of Revenue [Line Items]      
Revenue 82,010 104,018  
Liability, revenue recognized 300    
Effect of exchange rate differences on cash 200    
Polymer | Cariflex      
Disaggregation of Revenue [Line Items]      
Revenue 40,867 39,525  
Polymer | Other      
Disaggregation of Revenue [Line Items]      
Revenue 86 (202)  
Chemical      
Disaggregation of Revenue [Line Items]      
Revenue 195,356 213,321  
Chemical | Adhesives      
Disaggregation of Revenue [Line Items]      
Revenue 65,576 73,148  
Chemical | Performance Chemicals      
Disaggregation of Revenue [Line Items]      
Revenue 116,753 122,941  
Chemical | Tires      
Disaggregation of Revenue [Line Items]      
Revenue $ 13,027 $ 17,232