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Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Cash Flows from Operating Activities:    
Net (Loss) income $ (13,150) $ 29,149
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 31,551 25,864
Gain on sale of properties (1,386) (6,115)
Unrealized gain (loss) on derivative instruments 16,856 (17,574)
Provision for deferred income taxes (6,389) 13,237
Gain on settlement of asset retirement obligations   (1,797)
Changes in assets and liabilities:    
Decrease in accounts receivable 2,769 5,379
Decrease (increase) in due from related parties 308 (247)
Decrease in inventories 64 24
Decrease in prepaid expenses and other assets 410 286
(Decrease) increase in accounts payable (3,539) 534
(Decrease) increase in accrued liabilities (6,280) 7,425
Net Cash Provided by Operating Activities 21,214 56,165
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (14,550) (38,758)
Proceeds from sale of properties and equipment 1,926 6,834
Net Cash Used in Investing Activities (12,624) (31,924)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (1,853) (3,276)
Purchase of non-controlling interests (409) (274)
Increase in long-term bank debt and other long-term obligations 27,700 57,417
Repayment of long-term bank debt and other long-term obligations (33,453) (77,917)
Distribution to non-controlling interest (34) (508)
Net Cash Used in Financing Activities (8,049) (24,558)
Net Increase (Decrease) in Cash and Cash Equivalents 541 (317)
Cash and Cash Equivalents at the Beginning of the Year 9,209 9,526
Cash and Cash Equivalents at the End of the Year 9,750 9,209
Supplemental Disclosures:    
Income taxes paid during the year 410 320
Interest paid during the year $ 3,695 $ 4,025