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Divestitures Divestitures - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 14, 2016
Feb. 01, 2016
Jan. 04, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash proceeds from divestitures, net           $ 6,857 $ 310,599
Gain (loss) on sales of businesses, net       $ 0 $ 974 $ 0 122,298
Chemetall Surface Treatment              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash proceeds from divestitures, net $ 3,100,000            
Working capital settlement       $ 6,900      
Metal Sulfides Business              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash proceeds from divestitures, net     $ 137,000        
Gain (loss) on sales of businesses, net             11,500
Mineral Flame Retardants and Specialty Chemicals Businesses              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash proceeds from divestitures, net   $ 187,000          
Gain (loss) on sales of businesses, net             112,300
Magnifin Magnesiaprodukte GmbH & Co. KG              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Ownership percentage   50.00%          
Corporate | Wafer Reclaim              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain (loss) on sales of businesses, net             (1,500)
United States | Chemetall Surface Treatment              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Discrete non-cash charge         381,500   381,500
Foreign | Chemetall Surface Treatment              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Discrete non-cash charge         $ 35,200   $ 35,200