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
Jun. 30, 2019
Jun. 30, 2018
Supplemental Cash Items:    
Cash Paid During the Period for Interest $ 34,403 $ 35,064
Non-cash Investing Activities:    
Oil and Natural Gas Properties Included in Accounts Payable and Accrued Liabilities 151,145 80,097
Capitalized Asset Retirement Obligations 470 593
Compensation Capitalized on Oil and Gas Properties 190 107
Issuance of Common Stock 0 279,314
Exchange transactions - non-cash securities issued:    
Issuance of Common Stock - fair value at issuance date 0 279,314
Issuance of 8.50% Second Lien Notes due 2023 - PIK Interest 1,742 0
Debt Exchange Derivative Liability Settlements 12,192 0
Contingent Consideration Settlements 21,462 0
Oil and Natural Gas Properties    
Non-cash Investing Activities:    
Issuance of Common Stock 0 15,240
Exchange transactions - non-cash securities issued:    
Issuance of Common Stock - fair value at issuance date 0 15,240
8.50% Second Lien Notes due 2023    
Exchange transactions - non-cash securities issued:    
Issuance of 8.50% Second Lien Notes due 2023 $ 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 (543,683)
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