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CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash Flows from Operating Activities:    
Net Income $ 14,665 $ 47,434
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 37,729 36,068
Gain on sale of properties (3,662) (41,258)
Unrealized (gain) on derivative instruments (5,330) (547)
Provision (Benefit) for deferred income taxes 7,866 (12,538)
Changes in assets and liabilities:    
Accounts receivable 2,000 (9,561)
Due to related parties (60) 101
Inventories 11 (9)
Prepaid expenses and other assets (1,226) (344)
Accounts payable (15,063) 12,650
Accrued liabilities 2,136 8,111
Net Cash Provided by Operating Activities 39,066 40,107
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (47,073) (59,361)
Proceeds from sale of properties and equipment 3,233 46,231
Net Cash Used in by Investing Activities (43,840) (13,130)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (7,956) (5,650)
Purchase of non-controlling interests (65) (308)
Increase in long-term bank debt and other long-term obligations 55,800 64,853
Repayment of long-term bank debt and other long-term obligations (42,048) (82,628)
Distribution to non-controlling interest (3,080) (4,917)
Net Cash Provided by (used in) provided by Financing Activities 2,651 (28,650)
Net Decrease in Cash and Cash Equivalents (2,123) (1,673)
Cash and Cash Equivalents at the Beginning of the Year 8,438 10,111
Cash and Cash Equivalents at the End of the Year 6,315 8,438
Supplemental Disclosures:    
Income taxes paid during the year 2,130 414
Interest paid during the year $ 3,535 $ 2,339