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Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash Flows from Operating Activities:    
Net (loss) $ 3,112 $ (2,056)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 11,581 11,138
Gain on sale and exchange of assets (16,323) (1,217)
Unrealized loss on derivative instruments, net   9,105
Provision (benefit) for deferred income taxes 493 (1,632)
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable 2,533 (30)
Decrease in other assets 521 43
Decrease in accounts payable (3,582) (2,343)
Increase (decrease) in accrued liabilities 6,522 (4,836)
Increase in due to related parties 36 347
Net Cash Provided by Operating Activities 4,893 8,519
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (12,205) (7,823)
Proceeds from sale of property and equipment 16,323 1,752
Net Cash Provided by (Used in) Investing Activities 4,118 (6,071)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (509) (1,317)
Purchase of non-controlling interests (176) (5)
Proceeds from long-term bank debt and other long-term obligations 9,000 15,200
Repayment of long-term bank debt and other long-term obligations (8,515) (19,466)
Distribution to non-controlling interests   (16)
Net Cash Provided by (Used) in Financing Activities (200) (5,604)
Net Increase (Decrease) in Cash and Cash Equivalents 8,811 (3,156)
Cash and Cash Equivalents at the Beginning of the Period 9,750 9,209
Cash and Cash Equivalents at the End of the Period 18,561 6,053
Supplemental Disclosures:    
Income taxes paid   583
Interest paid $ 1,796 $ 2,164