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Debt (Credit Agreement) (Details)
3 Months Ended
May 02, 2020
USD ($)
Apr. 02, 2020
USD ($)
Apr. 01, 2020
USD ($)
Mar. 31, 2020
USD ($)
qtr
Apr. 16, 2020
installment
Apr. 03, 2020
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]              
Credit facility maximum borrowing amount       $ 750,000,000      
Current borrowing capacity       325,000,000      
Credit facility, remaining borrowing capacity       180,000,000      
Credit facility       $ 145,000,000     $ 130,000,000
Subsequent event              
Line of Credit Facility [Line Items]              
Current borrowing capacity           $ 175,000,000  
Additional borrowings under Credit Agreement   $ 90,000,000 $ 15,000,000        
Credit facility   $ 250,000,000          
Borrowing base deficiency, Credit Agreement           $ 75,000,000  
Number of installment payments to eliminate borrowing base deficiency | installment         6    
Installment payment, amount $ 12,500,000            
Credit agreement              
Line of Credit Facility [Line Items]              
Number of consecutive quarters | qtr       4      
Minimum | Credit agreement              
Line of Credit Facility [Line Items]              
Current Ratio covenant       1.00      
Maximum | Credit agreement              
Line of Credit Facility [Line Items]              
Ratio of debt to EBITDAX       4.0      
Adjusted LIBO Rate | Credit agreement              
Line of Credit Facility [Line Items]              
Weighted average interest rate       3.15%