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Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash Flows from Operating Activities:    
Net (loss) $ (1,178) $ (218)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 5,275 5,452
Gain on sale of properties (4,916) (489)
Unrealized loss on derivative instruments, net   2,466
Provision (benefit) for deferred income taxes (290) (63)
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable (67) 700
Decrease in due from related parties 171 255
Decrease in other assets 712 302
(Decrease) in accounts payable (2,814) (1,162)
Increase (decrease) in accrued liabilities 4,268 (5,914)
Net Cash Provided by Operating Activities 1,161 1,329
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (7,920) (4,533)
Proceeds from sale of properties and equipment 4,916 525
Net Cash Used in Investing Activities (3,004) (4,008)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (485) (1,280)
Purchase of non-controlling interests (179) (1)
Proceeds from long-term bank debt and other long-term obligations 9,000 11,200
Repayment of long-term bank debt and other long-term obligations (2,754) (10,755)
Distribution to non-controlling interests   (16)
Net Cash Provided by (Used) in Financing Activities 5,582 (852)
Net Increase (Decrease) in Cash and Cash Equivalents 3,739 (3,531)
Cash and Cash Equivalents at the Beginning of the Period 9,750 9,209
Cash and Cash Equivalents at the End of the Period 13,489 5,678
Supplemental Disclosures:    
Income taxes paid 91 498
Interest paid $ 806 $ 1,237