Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Revolving Credit Facility (Details)

v3.19.1
LONG-TERM DEBT - Revolving Credit Facility (Details) - Revolving Credit Facility
Oct. 05, 2018
USD ($)
Mar. 31, 2019
Line of Credit Facility [Line Items]    
Revolving credit facility, maximum borrowing $ 750,000,000.0  
Debt term 5 years  
Number of days before maturity date 91 days  
Current borrowing capacity $ 425,000,000.0  
Maximum debt to EBITDAX ratio under debt covenant 4.00  
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 1.75%  
LIBOR Loans | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.75%  
Base rate | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.75%  
Base rate | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.75%