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
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Supplemental Cash Items:    
Cash Paid During the Period for Interest, Net of Amount Capitalized $ 42,736 $ 52,916
Cash Paid During the Period for Income Taxes 0 0
Non-cash Operating Activities:    
Contingent Consideration Settlements in Excess of Acquisition-Date Liabilities 0 18,480
Non-cash Investing Activities:    
Oil and Natural Gas Properties Included in Accounts Payable and Accrued Liabilities 76,498 178,772
Capitalized Asset Retirement Obligations 457 3,703
Compensation Capitalized on Oil and Gas Properties 385 296
Non-cash Financing Activities:    
Issuance of 8.50% Second Lien Notes due 2023 - PIK Interest 0 1,742
Issuance of Common Stock for Preferred Stock Exchange 1,113 0
Debt Exchange Derivative Liability Settlements 0 15,735
Contingent Consideration Settlements 0 17,822
Common Stock    
Non-cash Investing Activities:    
Issuance of Stock 37,169 0
Non-cash Financing Activities:    
Issuance of Stock 37,169 0
Preferred Stock    
Non-cash Investing Activities:    
Issuance of Stock 81,212 0
Non-cash Financing Activities:    
Issuance of Stock 81,212 0
Unsecured VEN Bakken Note    
Non-cash Investing Activities:    
Issuance of Notes $ 0 128,660
8.50% Second Lien Notes due 2023    
Non-cash Financing Activities:    
Interest rate 8.50%  
Acquisitions of Oil and Natural Gas Properties    
Non-cash Investing Activities:    
Issuance of Stock $ 0 11,708
Non-cash Financing Activities:    
Issuance of Stock 0 11,708
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