Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Supplemental Cash Flow Information (Details)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Oct. 21, 2019
Jun. 30, 2020
Jun. 30, 2019
Supplemental Cash Items:      
Cash Paid During the Period for Interest, Net of Amount Capitalized   $ 29,117 $ 34,403
Non-cash Investing Activities:      
Oil and Natural Gas Properties Included in Accounts Payable and Accrued Liabilities   92,537 151,145
Capitalized Asset Retirement Obligations   294 470
Compensation Capitalized on Oil and Gas Properties   284 190
Non-cash Financing Activities:      
Issuance of 8.50% Second Lien Notes due 2023 - PIK Interest   0 1,742
Debt Exchange Derivative Liability Settlements   0 12,192
Contingent Consideration Settlements   0 21,462
Common Stock      
Non-cash Financing Activities:      
Issuance of Preferred Stock for 2L Notes Repurchase   29,615 0
Preferred Stock      
Non-cash Financing Activities:      
Issuance of Preferred Stock for 2L Notes Repurchase   $ 81,212 0
8.50% Second Lien Notes due 2023      
Non-cash Financing Activities:      
Non-cash securities exchanged $ 70,800    
Interest rate   8.50%  
Second Lien Notes | 8.50% Second Lien Notes due 2023      
Non-cash Financing Activities:      
Issuance of 8.50% Second Lien Notes due 2023 - PIK Interest   $ 0 $ 3,480