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Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Cash Flows from Operating Activities:    
Net Income(loss) $ 5,422 $ (13,150)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 30,174 31,551
Gain on sale of properties (32,378) (1,386)
Unrealized loss on derivative instruments 3,582 16,856
Provision for deferred income taxes 147 (6,389)
Changes in assets and liabilities:    
Decrease in accounts receivable 2,143 2,769
Increase (Decrease) in due from related parties (25) 308
Decrease in inventories 61 64
Decrease in prepaid expenses and other assets 207 410
Decrease in accounts payable (390) (3,539)
Increase (Decrease) in accrued liabilities 2,062 (6,280)
Net Cash Provided by Operating Activities 11,005 21,214
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (20,843) (14,550)
Proceeds from sale of properties and equipment 35,226 1,926
Net Cash Provided by (Used in) Investing Activities 14,383 (12,624)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (1,093) (1,853)
Purchase of non-controlling interests (224) (409)
Increase in long-term bank debt and other long-term obligations 13,500 27,700
Repayment of long-term bank debt and other long-term obligations (39,910) (33,453)
Distribution to non-controlling interest (843) (34)
Net Cash Used in Financing Activities (28,570) (8,049)
Net Decrease (Increase) in Cash and Cash Equivalents (3,182) 541
Cash and Cash Equivalents at the Beginning of the Year 9,750 9,209
Cash and Cash Equivalents at the End of the Year 6,568 9,750
Supplemental Disclosures:    
Income taxes paid during the year 120 410
Interest paid during the year $ 3,476 $ 3,695