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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash Flows from Operating Activities:    
Net (loss) $ (3,869) $ (6,990)
Adjustments to reconcile net (loss) to net cash (provided by) operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 13,107 15,093
Gain on sale and exchange of assets (106) (194)
Unrealized (gain) loss on derivative instruments, net 5,968 (941)
Deferred income taxes (1,514) (2,315)
Changes in assets and liabilities:    
Accounts receivable (3,022) 5,343
Due to related parties (38)  
Prepaid and other assets (939) (423)
Accounts payable 3,327 2,126
Accrued liabilities (1,490) (2,896)
Net Cash Provided by Operating Activities 11,424 8,803
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (3,729) (6,046)
Proceeds from sale of properties and equipment 106 194
Net Cash (Used in) Investing Activities (3,623) (5,852)
Cash Flows from Financing Activities:    
Purchase of stock for treasury   (709)
Proceeds from long-term bank debt and other long-term obligations 3,000 6,243
Repayment of long-term bank debt and other long-term obligations (8,000) (5,000)
Net Cash (Used in) Provided by Financing Activities (5,000) 534
Net Increase in Cash and Cash Equivalents 2,801 3,485
Cash and Cash Equivalents at the Beginning of the Period 996 1,015
Cash and Cash Equivalents at the End of the Period 3,797 4,500
Supplemental Disclosures:    
Income taxes paid
Interest paid $ 1,009 $ 1,182