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DEBT - Senior Facility (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2020
USD ($)
Oct. 18, 2019
Jul. 31, 2020
Apr. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
item
Mar. 31, 2020
Jun. 30, 2020
USD ($)
Nov. 01, 2020
USD ($)
Nov. 21, 2019
USD ($)
Oct. 08, 2019
USD ($)
Oct. 02, 2019
USD ($)
Oct. 01, 2019
USD ($)
Current and long-term debt                        
Debt         $ 144,000   $ 181,209          
Covenant compliance             As of June 30, 2020 (Successor), after giving effect to the Waiver, the Company was in compliance with the financial covenants under the Senior Credit Agreement.          
Cash and cash equivalents         5,701   $ 401       $ 15,546 $ 15,546
Senior revolving credit facility                        
Current and long-term debt                        
Amount available for issuance of letters of credit                   $ 50,000    
Threshold of Total Tet Indebtedness Leverage Ratio           3.50            
Senior revolving credit facility | Minimum                        
Current and long-term debt                        
Prepayment deficiency percentage exception   10.00%                    
Senior revolving credit facility | ABR-based | Minimum                        
Current and long-term debt                        
Applicable margin (as a percent)       1.50%                
Senior revolving credit facility | LIBOR | Maximum                        
Current and long-term debt                        
Variable rate percentage   50.00%                    
Successor Senior revolving credit facility                        
Current and long-term debt                        
Debt         $ 144,000   179,000          
Maximum borrowing capacity                   $ 750,000,000    
Current borrowing capacity $ 200,000     $ 200,000                
Number of interim unscheduled redeterminations of borrowing base to which the company and lender each have the right | item         1              
Number of consecutive semi-annual redeterminations between which the company and the lenders each have the right to one interim unscheduled redetermination of borrowing base | item         2              
Amount outstanding             179,000          
Letters of credit outstanding             5,000          
Borrowing capacity available             $ 16,000          
Successor Senior revolving credit facility | Minimum                        
Current and long-term debt                        
Current ratio             1.00          
Successor Senior revolving credit facility | ABR-based | Maximum                        
Current and long-term debt                        
Applicable margin (as a percent)       2.50%                
Successor Senior revolving credit facility | LIBOR | Minimum                        
Current and long-term debt                        
Applicable margin (as a percent)       2.50%                
Successor Senior revolving credit facility | LIBOR | Maximum                        
Current and long-term debt                        
Applicable margin (as a percent)       3.50%                
First Amendment To Senior Revolving Credit Facility                        
Current and long-term debt                        
Current borrowing capacity                 $ 240,000      
Threshold of Total Tet Indebtedness Leverage Ratio           3.50            
Second Amendment to the Senior Credit Agreement [Member]                        
Current and long-term debt                        
Current borrowing capacity 200,000     $ 200,000                
Scheduled borrowing base reductions per month 5,000     $ 5,000                
Second Amendment to the Senior Credit Agreement [Member] | Minimum                        
Current and long-term debt                        
Maximum cash balance to be carried before needing to repay borrowings $ 10,000                      
Credit facility, waiver, settlement 100.00%                      
Second Amendment to the Senior Credit Agreement [Member] | ABR-based | Minimum                        
Current and long-term debt                        
Applicable margin (as a percent) 1.50%                      
Second Amendment to the Senior Credit Agreement [Member] | ABR-based | Maximum                        
Current and long-term debt                        
Applicable margin (as a percent) 2.50%                      
Second Amendment to the Senior Credit Agreement [Member] | Euro-dollar based | Minimum                        
Current and long-term debt                        
Applicable margin (as a percent) 2.50%                      
Second Amendment to the Senior Credit Agreement [Member] | Euro-dollar based | Maximum                        
Current and long-term debt                        
Applicable margin (as a percent) 3.50%                      
Subsequent event | Successor Senior revolving credit facility | Minimum                        
Current and long-term debt                        
Current Ratio waived     1.00                  
Forecast | Second Amendment to the Senior Credit Agreement [Member]                        
Current and long-term debt                        
Current borrowing capacity               $ 185,000