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Industry Segments and Foreign Operations - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Segment Reporting Information [Line Items]      
Number of operating segments | segment 2    
Capital expenditures $ 22,327   $ 23,373
Gain on insurance proceeds 11,100   0
Hurricane      
Segment Reporting Information [Line Items]      
Estimated associated margin with lost sales 5,900    
Production downtime, costs incurred 5,900    
Proceeds from insurance reimbursement 10,000    
Insurance receivable 10,000    
Proceeds from insurance   $ 1,100  
Gain on insurance proceeds 11,100    
Hurricane | Minimum      
Segment Reporting Information [Line Items]      
Replacement cost associated with damaged equipment 9,000    
Hurricane | Maximum      
Segment Reporting Information [Line Items]      
Replacement cost associated with damaged equipment 11,000    
Polymer      
Segment Reporting Information [Line Items]      
Capital expenditures 11,500   9,700
Gain on insurance proceeds 0   0
Chemical      
Segment Reporting Information [Line Items]      
Capital expenditures 10,900   13,600
Gain on insurance proceeds $ 11,100   $ 0