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Note 7 - Long-term Debt (Details Textual)
$ in Thousands
1 Months Ended 6 Months Ended
Nov. 01, 2023
USD ($)
Sep. 14, 2023
USD ($)
Sep. 12, 2023
USD ($)
Jul. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Nov. 30, 2022
USD ($)
Nov. 20, 2022
USD ($)
Feb. 28, 2022
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument, Unamortized Discount [1]                   $ 22,156   $ 27,062    
Payments of Debt Issuance Costs                   58 $ 1,399      
Term Loan Credit Agreement [Member]                            
Debt Instrument, Unamortized Discount     $ 30,000                   $ 2,700  
Debt Issuance Costs, Gross     $ 24,000                      
Debt Instrument Discount Percentage     0.025                      
Debt Instrument, Optional Prepayment, Percentage of Principal     0.01                      
Debt Instrument, Covenant, Minimum Current Ratio     0.00015                      
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio     0.0002                      
Debt Instrument, Covenant, Priority Facility Limit     $ 100,000                      
Debt Instrument, Periodic Payment     $ 30,000                      
Repayments of Senior Debt                   60,000 $ (0)      
Term Loan Credit Agreement [Member] | Adjusted SOFR [Member]                            
Debt Instrument, Basis Spread on Variable Rate     0.075%                      
Term Loan Credit Agreement [Member] | Adjusted Above Margin [Member]                            
Debt Instrument, Basis Spread on Variable Rate     0.02%                      
Senior Credit Facility Agreement Due 2026 [Member]                            
Debt Issuance Costs, Gross $ 1,100                          
Line of Credit Facility, Current Borrowing Capacity $ 100,000                          
Senior Credit Facility Agreement Due 2026 [Member] | Adjusted Above Margin [Member]                            
Debt Instrument, Basis Spread on Variable Rate 2.00%                          
Senior Unsecured Notes Due 2024 [Member]                            
Debt Instrument, Unamortized Discount                 $ 3,200 $ 64,800        
Debt Issuance Costs, Gross                 1,500          
Debt Instrument, Face Amount                 $ 225,000          
Debt Instrument, Interest Rate, Stated Percentage                 10.00% 10.00%        
Proceeds from Issuance of Debt                 $ 202,900          
Payments of Debt Issuance Costs                 22,100          
The 10.625% Senior Notes [Member]                            
Debt Instrument, Unamortized Discount   $ 11,700                        
Debt Issuance Costs, Gross   3,700                        
Debt Instrument, Face Amount             $ 225,000             $ 25,000
Debt Instrument, Interest Rate, Stated Percentage               10.625%   10.625%       10.625%
Proceeds from Issuance of Debt               $ 223,700            
Payments of Debt Issuance Costs             $ 26,300              
Interest Paid, Including Capitalized Interest, Operating and Investing Activities         $ 8,300                  
Redemption Premium   $ 4,500                        
Maximum [Member] | Senior Credit Facility Agreement Due 2026 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate 5.00%                          
Maximum [Member] | Senior Credit Facility Agreement Due 2026 [Member] | Base Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate 4.00%                          
Minimum [Member] | Senior Credit Facility Agreement Due 2026 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate 4.00%                          
Minimum [Member] | Senior Credit Facility Agreement Due 2026 [Member] | Base Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate 3.00%                          
Revolving Credit Facility [Member]                            
Long-Term Debt, Gross                   $ 1,140,000   1,200,000    
Revolving Credit Facility [Member] | Fifth Third Bank, National Association [Member]                            
Debt Issuance Costs, Gross                       3,300    
Line of Credit Facility, Maximum Borrowing Capacity           $ 700,000                
Line of Credit Facility, Commitment Fee Amount           $ 575,000                
Debt Instrument, Covenant, Minimum Availability Percentage for Dividend and Distributions         25.00%           25.00%      
Debt Instrument, Covenant, Dividends and Distributions Limit         $ 4,000           $ 4,000      
Debt Instrument, Restriction on Borrowings, Minimum Net Proceeds From Equity Securities       $ 95,000                    
Long-Term Debt, Gross                 $ 0          
Revolving Credit Facility [Member] | Term Loan Credit Agreement [Member]                            
Debt Instrument, Covenant, Minimum Cash Threshold for Prepayment to be Due     $ 20,000                      
Revolving Credit Facility [Member] | Maximum [Member] | Term Loan Credit Agreement [Member]                            
Debt Instrument, Face Amount     $ 1,200,000                      
Other Noncurrent Assets [Member]                            
Debt Instrument, Unamortized Discount                   30,000   30,000    
Accumulated Amortization, Debt Discount                   7,800   2,900    
Debt Issuance Costs, Gross                   25,100   25,000    
Accumulated Amortization, Debt Issuance Costs                   $ 6,500   $ 2,400    
[1] Discounts as of June 30, 2024 and December 31, 2023 consisted of $30.0 million in discounts less accumulated amortization of $7.8 million and $2.9 million, respectively.