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LONG-TERM DEBT - Revolving Credit Facility (Details) - Revolving Credit Facility
$ in Millions
Oct. 05, 2018
Mar. 31, 2020
USD ($)
Line of Credit Facility [Line Items]    
Number of days before maturity date 91 days  
Current borrowing capacity   $ 800.0
Maximum debt to EBITDAX ratio under debt covenant 3.50  
Minimum current ratio under debt covenant 1.00  
Minimum percent of the fair value of reserves secured by mortgages   85.00%
Federal funds effective rate    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.50%  
LIBOR Loans    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.00%  
LIBOR Loans | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.00%  
LIBOR Loans | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 3.00%  
Base rate | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.00%  
Base rate | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.00%