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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Jan. 25, 2023
May 17, 2022
Debt Instrument [Line Items]        
Principal $ 3,905,139 $ 3,823,215    
Unamortized Premium, Discount and Debt Issuance Costs 56,537 58,751    
Net Value 3,848,602 3,764,464    
5.875% Alkali senior secured notes due 2042(2)        
Debt Instrument [Line Items]        
Principal 400,000      
Credit Facility | Revolving Credit Facility | Revolving Loan        
Debt Instrument [Line Items]        
Principal 383,200 298,300    
Unamortized Premium, Discount and Debt Issuance Costs 0 0    
Net Value 383,200 298,300    
Unamortized debt issuance costs 5,000 5,700    
Senior Notes | 6.250% senior unsecured notes due 2026        
Debt Instrument [Line Items]        
Principal 339,310 339,310    
Unamortized Premium, Discount and Debt Issuance Costs 1,562 1,746    
Net Value $ 337,748 337,564    
Interest rate 6.25%      
Senior Notes | 8.000% senior unsecured notes due 2027        
Debt Instrument [Line Items]        
Principal $ 981,245 981,245    
Unamortized Premium, Discount and Debt Issuance Costs 3,215 3,549    
Net Value $ 978,030 977,696    
Interest rate 8.00%      
Senior Notes | 7.750% senior unsecured notes due 2028        
Debt Instrument [Line Items]        
Principal $ 679,360 679,360    
Unamortized Premium, Discount and Debt Issuance Costs 5,747 6,121    
Net Value $ 673,613 673,239    
Interest rate 7.75%      
Senior Notes | 5.875% Alkali senior secured notes due 2042(2)        
Debt Instrument [Line Items]        
Principal $ 422,024 425,000   $ 425,000
Unamortized Premium, Discount and Debt Issuance Costs 21,593 21,791    
Net Value $ 400,431 403,209    
Interest rate 5.875%     5.875%
Debt Instrument, Interest Rate, Limited Term Percentage       0.10
Senior Notes | 8.250% Senior Unsecured Notes Due 2029        
Debt Instrument [Line Items]        
Principal $ 600,000 600,000    
Unamortized Premium, Discount and Debt Issuance Costs 16,410 17,202    
Net Value $ 583,590 582,798    
Interest rate 8.25%      
2030 Notes | Senior Notes        
Debt Instrument [Line Items]        
Principal $ 500,000 500,000    
Unamortized Premium, Discount and Debt Issuance Costs 8,010 8,342    
Net Value $ 491,990 $ 491,658    
Interest rate 8.875%   8.875%