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Debt - Facility (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2020
USD ($)
Sep. 30, 2020
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 30, 2018
USD ($)
Feb. 28, 2018
USD ($)
Debt Instrument [Line Items]                        
Restricted cash   $ 195,000 $ 195,000         $ 4,302,000   $ 4,527,000    
Facility                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity $ 1,600,000,000         $ 1,500,000,000 $ 1,600,000,000   $ 1,700,000,000   $ 1,600,000,000 $ 1,500,000,000
Additional commitments                   $ 100,000,000 $ 100,000,000 $ 500,000,000
Commitment reduction $ 100,000,000.0                      
Available borrowing base       $ 1,320,000,000                
Repayments of Debt   $ 250,000,000                    
Net leverage ratio   2.50 2.50                  
Field life cover ratio         1.30              
Loan life cover ratio         1.10              
Interest cover ratio         2.25              
Facility Interest Or Senior Notes Plus The Corporate Revolver                        
Debt Instrument [Line Items]                        
Interval period for payment of interest     6 months                  
Revolving Credit Facility | Facility                        
Debt Instrument [Line Items]                        
Interval period for payment of interest     6 months                  
Amount outstanding   $ 1,200,000,000 $ 1,200,000,000                  
Undrawn availability   120,000,000.0 $ 120,000,000.0                  
Commitment fee percentage of the then-applicable margin when commitment is available for utilization     30.00%                  
Commitment fee percentage of the then-applicable margin when commitment is not available for utilization     20.00%                  
Availability period of revolving-credit     1 month                  
Amount outstanding under letters of credit   $ 0 $ 0                  
Revolving Credit Facility | Facility | Stated Period                        
Debt Instrument [Line Items]                        
Debt cover ratio     4.75                  
Revolving Credit Facility | Facility | Normal Period                        
Debt Instrument [Line Items]                        
Debt cover ratio     3.5                  
Revolving Credit Facility | Facility | LIBOR | Minimum                        
Debt Instrument [Line Items]                        
Applicable margin     3.25%                  
Revolving Credit Facility | Facility | LIBOR | Maximum                        
Debt Instrument [Line Items]                        
Applicable margin     4.50%