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
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
May 15, 2018
Supplemental Cash Items:        
Cash Paid During the Period for Interest $ 16,929 $ 7,631    
Cash Paid During the Period for Income Taxes 0 0    
Non-cash Investing Activities:        
Oil and Natural Gas Properties Included in Accounts Payable 133,872 85,068 $ 129,500  
Capitalized Asset Retirement Obligations 226 184    
Compensation Capitalized on Oil and Gas Properties 84 54    
Non-cash Financing Activities:        
Issuance of 8.50% Second Lien Notes due 2023 - PIK Interest 1,742 0    
Contingent Consideration Settlements 2,887 0    
Second Lien Notes | Senior Second Lien Notes Due 2023        
Non-cash Financing Activities:        
Issuance of 8.50% Second Lien Notes due 2023 - PIK Interest $ 1,738 $ 0    
Interest rate 8.50%     8.50%