Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Net income	$ 29,149us-gaap_ProfitLoss	$ 13,440us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion on discounted liabilities	25,864	21,861
Gain on sale of properties	(6,115)	(2,816)
Unrealized (gain) loss on derivative instruments	(17,574)us-gaap_UnrealizedGainLossOnDerivatives	649us-gaap_UnrealizedGainLossOnDerivatives
Provision for deferred income taxes	13,237us-gaap_DeferredIncomeTaxExpenseBenefit	7,014us-gaap_DeferredIncomeTaxExpenseBenefit
(Gain) Loss on settlement of asset retirement obligations	(1,797)	40
Changes in assets and liabilities:
Decrease (increase) in accounts receivable	5,379	(4,481)
Increase in due from related parties	(247)	(96)
Decrease in inventories	24us-gaap_IncreaseDecreaseInInventories	91us-gaap_IncreaseDecreaseInInventories
Decrease in prepaid expenses and other assets	286	378
Increase (decrease) in accounts payable	534	(712)
Increase in accrued liabilities	7,425	332
Net Cash Provided by Operating Activities	56,165	35,700
Cash Flows from Investing Activities:
Capital expenditures, including exploration expense	(38,758)	(33,934)
Proceeds from sale of properties and equipment	6,834	3,681
Net Cash Used in Investing Activities	(31,924)	(30,253)
Cash Flows from Financing Activities:
Purchase of stock for treasury	(3,276)	(4,138)
Purchase of non-controlling interests	(274)	(48)
Increase in long-term bank debt and other long-term obligations	57,417	68,750
Repayment of long-term bank debt and other long-term obligations	(77,917)	(68,857)
Distribution to non-controlling interest	(508)	(230)
Net Cash Used in Financing Activities	(24,558)	(4,523)
Net (Decrease) Increase in Cash and Cash Equivalents	(317)	924
Cash and Cash Equivalents at the Beginning of the Year	9,526	8,602
Cash and Cash Equivalents at the End of the Year	9,209	9,526
Supplemental Disclosures:
Income taxes paid during the year	320us-gaap_IncomeTaxesPaidNet	754us-gaap_IncomeTaxesPaidNet
Interest paid during the year	$ 4,025us-gaap_InterestPaid	$ 4,183us-gaap_InterestPaid

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