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Revolving Credit Facilities (Details) - USD ($)
9 Months Ended
Oct. 06, 2021
Sep. 30, 2021
Apr. 30, 2021
Dec. 31, 2020
Nov. 30, 2020
Apr. 30, 2020
Jun. 30, 2019
Apr. 30, 2019
Short-term Debt [Line Items]                
Debt instrument, face amount       $ 400,000,000        
Federal Funds Open Rate                
Short-term Debt [Line Items]                
Basis spread on variable rate   0.50%            
Federal Funds Open Rate | Midstream                
Short-term Debt [Line Items]                
Basis spread on variable rate   0.50%            
Federal Funds Open Rate | Midstream | Subsequent Event                
Short-term Debt [Line Items]                
Basis spread on variable rate 0.50%              
One-Month LIBOR                
Short-term Debt [Line Items]                
Basis spread on variable rate   1.00%            
One-Month LIBOR | Midstream                
Short-term Debt [Line Items]                
Basis spread on variable rate   1.00%            
One-Month LIBOR | Midstream | Subsequent Event                
Short-term Debt [Line Items]                
Basis spread on variable rate 1.00%              
One-Month LIBOR | Minimum                
Short-term Debt [Line Items]                
Basis spread on variable rate   0.75%            
One-Month LIBOR | Minimum | Midstream                
Short-term Debt [Line Items]                
Basis spread on variable rate   0.50%            
One-Month LIBOR | Minimum | Midstream | Subsequent Event                
Short-term Debt [Line Items]                
Basis spread on variable rate 1.00%              
One-Month LIBOR | Maximum                
Short-term Debt [Line Items]                
Basis spread on variable rate   1.75%            
One-Month LIBOR | Maximum | Midstream                
Short-term Debt [Line Items]                
Basis spread on variable rate   1.50%            
One-Month LIBOR | Maximum | Midstream | Subsequent Event                
Short-term Debt [Line Items]                
Basis spread on variable rate 2.00%              
LIBOR | Minimum                
Short-term Debt [Line Items]                
Basis spread on variable rate   1.75%            
LIBOR | Minimum | Midstream                
Short-term Debt [Line Items]                
Basis spread on variable rate   1.50%            
LIBOR | Minimum | Midstream | Subsequent Event                
Short-term Debt [Line Items]                
Basis spread on variable rate 2.00%              
LIBOR | Maximum                
Short-term Debt [Line Items]                
Basis spread on variable rate   2.75%            
LIBOR | Maximum | Midstream                
Short-term Debt [Line Items]                
Basis spread on variable rate   2.50%            
LIBOR | Maximum | Midstream | Subsequent Event                
Short-term Debt [Line Items]                
Basis spread on variable rate 3.00%              
Revolving Credit Facility                
Short-term Debt [Line Items]                
Debt instrument, face amount             $ 160,000,000  
Initial borrowing base     $ 1,775,000,000   $ 1,775,000,000 $ 1,900,000,000    
Minimum current ratio   1.00            
Borrowings outstanding   $ 225,350,000   160,800,000        
Letters of credit outstanding   188,566,000   185,272,000        
Borrowings and issuance of letters of credit remaining capacity   1,361,084,000   1,428,928,000        
Letters of credit aggregate sub-limit         1,775,000,000      
Revolving Credit Facility | Subsequent Event                
Short-term Debt [Line Items]                
Letters of credit aggregate sub-limit $ 2,000,000,000              
Elected commitments 1,300,000              
Revolving Credit Facility | Midstream                
Short-term Debt [Line Items]                
Borrowings outstanding   146,000,000   291,000,000        
Letters of credit outstanding   30,000   30,000        
Borrowings and issuance of letters of credit remaining capacity   $ 453,970,000            
Letters of credit aggregate sub-limit               $ 600,000,000
Increase in available borrowings               250,000,000
Maximum borrowing capacity, letters of credit               $ 100,000,000
Interest coverage ratio   2.50            
Revolving credit available for borrowing       308,970,000        
Revolving Credit Facility | Midstream | Subsequent Event                
Short-term Debt [Line Items]                
Letters of credit aggregate sub-limit $ 600,000,000              
Interest coverage ratio 2.50              
Revolving Credit Facility | Minimum | Midstream                
Short-term Debt [Line Items]                
Maximum net leverage ratio   5.25            
Total leverage ratio   4.75            
Revolving Credit Facility | Minimum | Midstream | Subsequent Event                
Short-term Debt [Line Items]                
Maximum net leverage ratio 5.00              
Revolving Credit Facility | Maximum                
Short-term Debt [Line Items]                
Net leverage ratio   4.00            
Revolving Credit Facility | Maximum | Midstream                
Short-term Debt [Line Items]                
Maximum net leverage ratio   5.50            
Total leverage ratio   5.25            
Secured leverage ratio   3.50            
Revolving Credit Facility | Maximum | Midstream | Subsequent Event                
Short-term Debt [Line Items]                
Maximum net leverage ratio 5.25              
Secured leverage ratio 3.25              
Revolving Credit Facility | Federal Funds Open Rate | Subsequent Event                
Short-term Debt [Line Items]                
Basis spread on variable rate 0.50%              
Revolving Credit Facility | One-Month LIBOR | Subsequent Event                
Short-term Debt [Line Items]                
Basis spread on variable rate 1.00%              
Revolving Credit Facility | One-Month LIBOR | Minimum | Subsequent Event                
Short-term Debt [Line Items]                
Basis spread on variable rate 0.75%              
Revolving Credit Facility | One-Month LIBOR | Maximum | Subsequent Event                
Short-term Debt [Line Items]                
Basis spread on variable rate 1.75%              
Senior Notes due in January 2029 | Debt Instrument, Issuance, Period Two                
Short-term Debt [Line Items]                
Debt instrument, face amount         $ 500,000,000      
Stated rate, debt instrument         6.00%      
Convertible Senior Notes Due 2026                
Short-term Debt [Line Items]                
Debt instrument, face amount   $ 345,000,000   $ 345,000,000        
Stated rate, debt instrument   2.25%   2.25%        
6.50% Senior Notes due March 2026                
Short-term Debt [Line Items]                
Debt instrument, face amount   $ 234,169,000            
Stated rate, debt instrument   6.50%   6.50%        
6.50% Senior Notes due March 2026 | Midstream                
Short-term Debt [Line Items]                
Stated rate, debt instrument   6.50%            
6.50% Senior Notes due March 2026 | Minimum | Midstream                
Short-term Debt [Line Items]                
Debt instrument, face amount   $ 150,000,000            
6.50% Senior Notes due March 2026 | Maximum | Midstream                
Short-term Debt [Line Items]                
Debt instrument, face amount   $ 150,000,000