Annual report pursuant to Section 13 and 15(d)

SIGNIFICANT ACCOUNTING POLICIES - Supplemental Cash Flow Information (Details)

v3.20.4
SIGNIFICANT ACCOUNTING POLICIES - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Oct. 21, 2019
Nov. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 15, 2018
Supplemental Cash Items:            
Cash Paid During the Period for Interest     $ 55,109 $ 78,596 $ 78,865  
Non-cash Operating Activities:            
Contingent Consideration Settlements in Excess of Acquisition-date Liabilities     0 21,349 0  
Non-cash Investing Activities:            
Oil and Natural Gas Properties Included in Accounts Payable and Accrued Liabilities     88,564 161,743 129,452  
Capitalized Asset Retirement Obligations     710 4,042 2,854  
Contingent Consideration     324 0 32,312  
Compensation Capitalized on Oil and Gas Properties     495 412 369  
Non-cash Financing Activities:            
Debt Exchange Derivative Liability - fair value at issuance date     0 0 19,354  
Issuance of 8.50% Second Lien Notes due 2023 - PIK Interest     0 1,742 2,599  
Issuance of Common Stock for Preferred Stock Exchange     1,113 0 0  
Debt Exchange Derivative Liability Settlements     0 15,749 0  
Contingent Consideration Settlements     0 17,822 0  
Common Stock            
Non-cash Investing Activities:            
Issuance of stock     0 0 326,783  
Non-cash Financing Activities:            
Issuance of stock     0 0 326,783  
Unsecured Ven Bakken Note            
Non-cash Investing Activities:            
Issuance of notes     0 128,660 0  
Non-cash Financing Activities:            
Issuance of notes     0 128,660 0  
8.5% Second Lien Notes due 2023            
Non-cash Investing Activities:            
Issuance of stock     37,169 0 0  
Non-cash Financing Activities:            
Issuance of stock     37,169 0 0  
8.00% Unsecured Senior Notes due 2020 - carrying value $ (70,800)          
8.5% Second Lien Notes due 2023 | Second Lien Notes            
Non-cash Investing Activities:            
Issuance of notes     0 0 344,279  
Non-cash Financing Activities:            
Issuance of notes     0 0 344,279  
Issuance of 8.50% Second Lien Notes due 2023 - PIK Interest     0 3,480 0  
8.00% Unsecured Senior Notes due 2020 - carrying value   $ (70,800)        
Interest rate percentage           8.50%
8.5% Second Lien Notes due 2023 | Second Lien Notes | Preferred Stock            
Non-cash Investing Activities:            
Issuance of stock     81,212 75,000 0  
Non-cash Financing Activities:            
Issuance of stock     81,212 75,000 0  
8% Senior Notes due 2020            
Non-cash Financing Activities:            
8.00% Unsecured Senior Notes due 2020 - carrying value     0 0 (590,041)  
8% Senior Notes due 2020 | Senior Notes            
Non-cash Financing Activities:            
Interest rate percentage           8.00%
Acquisitions of Oil and Natural Gas Properties            
Non-cash Investing Activities:            
Issuance of stock     1,537 11,708 0  
Non-cash Financing Activities:            
Issuance of stock     $ 1,537 $ 11,708 $ 0