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Acquisition (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 01, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]        
Cash payment to acquire business   $ 0 $ 759  
Class A Convertible Preferred Stock Units | Private Placement        
Business Acquisition [Line Items]        
Temporary equity, stock issued during period (in shares) $ 750,000      
6.500% Senior Unsecured Notes Due October 2025        
Business Acquisition [Line Items]        
Debt issued   $ 550,000   $ 550,000
Senior unsecured notes, stated rate   6.50%   6.50%
Alkali Business        
Business Acquisition [Line Items]        
Cash payment to acquire business 1,325,000      
Working capital included in cash payment to acquire business 105,000      
Alkali Business | Class A Convertible Preferred Stock Units | Private Placement        
Business Acquisition [Line Items]        
Temporary equity, stock issued during period (in shares) 750,000      
Proceeds from issuance of Class A convertible preferred units, net 726,200      
Alkali Business | 6.500% Senior Unsecured Notes Due October 2025        
Business Acquisition [Line Items]        
Debt issued $ 550,000      
Senior unsecured notes, stated rate 6.50%      
Proceeds from issuance of unsecured debt $ 540,100