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Investments Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Investments [Line Items]      
Equity in net income of unconsolidated investments (net of tax) $ 59,637 $ 27,978 $ 35,742
Dividends received from unconsolidated investments 43,759 59,912 40,688
Investments in unconsolidated joint ventures exceeded the amount of underlying equity in net assets (6,800) 11,500  
Excess amount paid for joint ventures remaining to be amortized 600 800  
Return of capital from unconsolidated investment 0 98,000 0
Marketable equity securities 27,570 24,257  
Long-term advances to joint ventures [1] 31,776 31,780  
Joint ventures 429,794 411,119 [2]  
Significant Unconsolidated Joint Venture      
Schedule of Investments [Line Items]      
Investment in significant unconsolidated joint ventures 404,600 402,600  
Equity in net income of unconsolidated investments (net of tax) 56,800 25,400 34,700
Undistributed earnings from equity method investees 99,400 105,900  
Dividends received from unconsolidated investments $ 42,100 $ 58,100 $ 39,600
Windfield Holdings      
Schedule of Investments [Line Items]      
Ownership percentage 49.00% 49.00% 0.00%
Return of capital from unconsolidated investment   $ 98,000  
Saudi Organometallic Chemicals Company      
Schedule of Investments [Line Items]      
Ownership percentage 50.00%    
Interest rate margin over LIBOR 1.275%    
Joint ventures $ 7,500    
Benefit Protection Trust      
Schedule of Investments [Line Items]      
Marketable equity securities 22,000 21,600  
Other Assets | Saudi Organometallic Chemicals Company      
Schedule of Investments [Line Items]      
Long-term advances to joint ventures $ 30,000 30,000  
Windfield Holdings      
Schedule of Investments [Line Items]      
Ownership percentage 49.00%    
Carrying value of unconsolidated investment $ 288,600    
Other Variable Interest Entities Excluding Windfield Holdings      
Schedule of Investments [Line Items]      
Carrying value of unconsolidated investment $ 8,800 7,800  
Jordan Bromine Company Limited      
Schedule of Investments [Line Items]      
Ownership percentage 50.00%    
Rockwood Holdings, Inc.      
Schedule of Investments [Line Items]      
Utilization of inventory markup   103,400  
Equity in net income of unconsolidated investments | Rockwood Holdings, Inc.      
Schedule of Investments [Line Items]      
Utilization of inventory markup   $ 27,100  
[1] See Note 10, “Investments.”
[2] Balance at December 31, 2015 excludes our investment in Magnifin Magnesiaprodukte GmbH & Co. KG (“Magnifin”) and two investments included in the sale of the Chemetall Surface Treatment business, which are included in Assets held for sale. Refer to Note 3, “Divestitures,” for additional information.