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Segment information (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information, Profit (Loss)        
Restructuring and other (income) charges, net     $ 5,600,000 $ 0
Operating Segments | Performance Chemicals        
Segment Reporting Information, Profit (Loss)        
Restructuring and other (income) charges, net $ 1,000,000   4,800,000  
Operating Segments | Performance Materials        
Segment Reporting Information, Profit (Loss)        
Restructuring and other (income) charges, net $ 0 $ (400,000) $ 800,000 $ (700,000)