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, 2019
Sep. 30, 2018
Supplemental Cash Items:    
Cash Paid During the Period for Interest $ 52,916 $ 55,849
Non-cash Operating Activities:    
Contingent Consideration Settlements in excess of acquisition-date liabilities 18,480 0
Non-cash Investing Activities:    
Oil and Natural Gas Properties Included in Accounts Payable and Accrued Liabilities 178,772 108,216
Capitalized Asset Retirement Obligations 3,703 1,644
Compensation Capitalized on Oil and Gas Properties 296 250
Issuance of Common Stock 0 326,783
Exchange transactions - non-cash securities issued:    
Issuance of Common Stock - fair value at issuance date 0 326,783
Debt Exchange Derivative Liability - fair value at issuance date 0 19,354
Issuance of 8.50% Second Lien Notes due 2023 - PIK Interest 1,742 0
Debt Exchange Derivative Liability Settlements 15,735 0
Contingent Consideration Settlements 17,822 0
Oil and Natural Gas Properties    
Non-cash Investing Activities:    
Issuance of Common Stock 11,708 105,517
Exchange transactions - non-cash securities issued:    
Issuance of Common Stock - fair value at issuance date 11,708 105,517
Unsecured VEN Bakken Note    
Non-cash Investing Activities:    
Issuance of Debt 128,660 0
Exchange transactions - non-cash securities issued:    
Issuance of Debt 128,660 0
8.50% Second Lien Notes due 2023    
Non-cash Investing Activities:    
Issuance of Debt 0 344,279
Exchange transactions - non-cash securities issued:    
Issuance of Debt $ 0 344,279
Exchange Transactions - non-cash securities exchanged:    
Interest rate 8.50%  
Unsecured Senior Notes due 2020    
Exchange Transactions - non-cash securities exchanged:    
8.00% Unsecured Senior Notes due 2020 - carrying value $ 0 (590,041)
Interest rate 8.00%  
Second Lien Notes | 8.50% Second Lien Notes due 2023    
Exchange transactions - non-cash securities issued:    
Issuance of 8.50% Second Lien Notes due 2023 - PIK Interest $ 3,480 $ 0