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Other (income) expense, net (Narratives) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
event
Jun. 30, 2015
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Number of restructuring events | event     2  
Other restructuring cost $ 700,000 $ 0 $ 700,000 $ 0
Severance costs 0 0 4,500,000 0
Gain on sale of assets and businesses 0 $ 400,000 0 $ 700,000
Performance Chemicals        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Asset impairment 300,000   300,000  
Duque De Caxias, Rio de Janeiro, Brazil, Performance Chemicals        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Other restructuring cost 700,000   700,000  
Asset impairment     100,000  
Severance costs     1,800,000  
Employee related severance cost        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Severance costs $ 0   2,700,000  
Employee related severance cost | Performance Chemicals        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Severance costs     1,900,000  
Employee related severance cost | Performance Materials        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Severance costs     $ 800,000