Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTY TRANSACTIONS (Details)

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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 22, 2019
Oct. 21, 2019
Jan. 31, 2019
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Nov. 30, 2019
Related Party Transaction [Line Items]                  
Long-term debt       $ 983,327   $ 983,327   $ 1,118,161  
Shares issued upon conversion of debt (in shares)           794,702      
Number of shares issued in transaction (in shares)       4,200,000          
Stock repurchased (in shares)       0   0 600,000    
Stock repurchased, value             $ 16,300    
W Energy Partners LLC | Common Stock                  
Related Party Transaction [Line Items]                  
Stock repurchased (in shares)     400,000            
Stock repurchased, value     $ 11,100            
Series A Preferred Stock                  
Related Party Transaction [Line Items]                  
Liquidation preference   $ 75,000              
Number of shares issued in transaction (in shares) 10,947                
Purchase price $ 1,100                
Conversion cap   9.99%              
Second Lien Notes due 2023                  
Related Party Transaction [Line Items]                  
Number of shares issued in transaction (in shares)       1,300,000 2,800,000        
8.50% Second Lien Notes due 2023                  
Related Party Transaction [Line Items]                  
Notes exchanged   $ 70,800              
Revolving Credit Facility | Second Lien Notes due 2023                  
Related Party Transaction [Line Items]                  
Long-term debt                 $ 200,000
Amount of debt converted $ 1,000                
Shares issued upon conversion of debt (in shares) 10,947