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Organization (Details)
$ in Thousands
12 Months Ended
Sep. 01, 2017
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Aug. 14, 2017
USD ($)
Business Acquisition [Line Items]          
Limited liabily company, ownership interest owned   100.00%      
Payments to Acquire Businesses, Gross   $ 1,325,759 $ 25,394 $ 1,520,299  
Number of divisions that constitute reportable segments | segment   4      
Convertible Preferred Stock [Member]          
Business Acquisition [Line Items]          
Temporary Equity, Stock Issued During Period, Value, New Issues $ 750,000        
Convertible Preferred Stock [Member] | Private Placement [Member]          
Business Acquisition [Line Items]          
Temporary Equity, Stock Issued During Period, Value, New Issues 750,000        
6.500% senior unsecured notes          
Business Acquisition [Line Items]          
Debt issued, aggregate principal amount   $ 550,000 $ 0    
Alkali Business [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Gross 1,325,000        
Alkali Business [Member] | Convertible Preferred Stock [Member] | Private Placement [Member]          
Business Acquisition [Line Items]          
Temporary Equity, Stock Issued During Period, Value, New Issues 750,000        
Alkali Business [Member] | 6.500% senior unsecured notes          
Business Acquisition [Line Items]          
Debt issued, aggregate principal amount $ 550,000       $ 550,000