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 6 Months Ended
Nov. 22, 2019
Oct. 21, 2019
Jan. 31, 2019
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]              
Long-term debt       $ 989,171 $ 989,171   $ 1,118,161
Shares issued upon conversion of debt (in shares)         794,702    
Number of shares issued in transaction (in shares)         28,500,000    
Stock repurchased (in shares)       0 0 5,600,000  
Stock repurchased, value           $ 16,300  
W Energy Partners LLC | Common Stock              
Related Party Transaction [Line Items]              
Stock repurchased (in shares)     3,700,000        
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%          
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