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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash Flows from Operating Activities:    
Net income (loss) $ (2,056) $ 7,500
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 11,138 10,959
Gain on sale and exchange of assets (1,217) (4,015)
Unrealized loss on derivative instruments, net 9,105 5,999
Provision (benefit) for deferred income taxes (1,632) 2,239
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable (30) 1,834
Decrease in other assets 43 63
Decrease in accounts payable (2,343) (874)
Increase (decrease) in accrued liabilities (4,836) 5,293
Increase in due to related parties 347 78
Net Cash Provided by Operating Activities 8,519 29,076
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (7,823) (20,742)
Proceeds from sale of property and equipment 1,752 4,668
Net Cash Used in Investing Activities (6,071) (16,074)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (1,317) (1,291)
Purchase of non-controlling interests (5) (209)
Proceeds from long-term bank debt and other long-term obligations 15,200 30,750
Repayment of long-term bank debt and other long-term obligations (19,466) (41,426)
Distribution to non-controlling interests (16) (35)
Net Cash Used in Financing Activities (5,604) (12,211)
Net Increase (Decrease) in Cash and Cash Equivalents (3,156) 791
Cash and Cash Equivalents at the Beginning of the Period 9,209 9,526
Cash and Cash Equivalents at the End of the Period 6,053 10,317
Supplemental Disclosures:    
Income taxes paid 583 356
Interest paid $ 2,164 $ 2,183