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LONG-TERM DEBT - Narrative (Details)
$ in Thousands
3 Months Ended
Jun. 24, 2020
USD ($)
Mar. 31, 2020
USD ($)
installment
Jan. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 23, 2018
USD ($)
Debt Instrument [Line Items]          
Current borrowing capacity         $ 87,500
Maximum borrowing capacity         250,000
Number of installments | installment   5      
Write-off of deferred financing fees   $ 1,056      
Deferred financing fees   10,790   $ 11,510  
Legal and financing fees   $ 1,000      
Face amount         $ 250,000
Interest rate   2.50%      
Total Proved Reserves, PV percentage   9.00%      
Available borrowing capacity   $ 58,600      
Subsequent event          
Debt Instrument [Line Items]          
Interest rate 3.50%        
Percentage of excess cash flow used to pay down Revolving Facility 50.00%        
Capital expenditure limitation for the period from May 1, 2020 to September 30, 2020 $ 5,000        
General and administrative expense limitation per quarter for the second and third quarters of 2020 3,000        
Revolving Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 190,000 $ 500,000 $ 250,000  
Interest rate   4.42%      
Letters of credit outstanding   $ 16,400      
Borrowing base     210,000    
Elected borrowing commitments     $ 190,000    
Revolving Facility | Subsequent event          
Debt Instrument [Line Items]          
Current borrowing capacity 38,600        
Maximum borrowing capacity $ 170,000        
Revolving Facility | Maximum          
Debt Instrument [Line Items]          
Leverage Ratio   3.5      
Revolving Facility | Minimum          
Debt Instrument [Line Items]          
Current Ratio   1.0      
Interest Coverage Ratio   1.5      
Revolving Facility | LIBOR | Maximum          
Debt Instrument [Line Items]          
Debt instrument, variable rate   3.25%      
Revolving Facility | LIBOR | Minimum          
Debt Instrument [Line Items]          
Debt instrument, variable rate   2.25%      
Term Loan          
Debt Instrument [Line Items]          
Debt instrument, variable rate   8.00%      
Interest rate   9.45%      
Term Loan | Subsequent event          
Debt Instrument [Line Items]          
Debt instrument, variable rate 10.00%        
Interest payable-in-kind 2.00%        
Term Loan | Minimum          
Debt Instrument [Line Items]          
Interest Coverage Ratio   1.5      
Asset Coverage Ratio   1.50      
Term Loan | LIBOR          
Debt Instrument [Line Items]          
Debt instrument, variable rate   8.00%      
Term Loan | Base Rate | Minimum          
Debt Instrument [Line Items]          
Interest rate   9.00%