Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash Flows from Operating Activities:
Net Income	$ 7,500	$ 8,922
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion on discounted liabilities	10,959	11,152
Gain on sale of properties	(4,015)	(1,759)
Unrealized (gain) loss on derivative instruments, net	5,999	(2,397)
Provision for deferred income taxes	2,239	4,374
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	1,834	(4,707)
Decrease in other assets	63	93
Decrease in accounts payable	(874)	(1,091)
Increase in accrued liabilities	5,293	2,239
Increase in due to related parties	78	49
Net Cash Provided by Operating Activities	29,076	16,875
Cash Flows from Investing Activities:
Capital expenditures, including exploration expense	(20,742)	(14,815)
Proceeds from sale of property and equipment	4,668	2,147
Net Cash Used in Investing Activities	(16,074)	(12,668)
Cash Flows from Financing Activities:
Purchase of stock for treasury	(1,291)	(2,734)
Purchase of non-controlling interests	(209)	(7)
Proceeds from long-term bank debt and other long-term obligations	30,750	27,250
Repayment of long-term bank debt and other long-term obligations	(41,426)	(28,000)
Distribution to non-controlling interests	(35)	(39)
Net Cash Used in Financing Activities	(12,211)	(3,530)
Net Increase in Cash and Cash Equivalents	791	677
Cash and Cash Equivalents at the Beginning of the Period	9,526	8,602
Cash and Cash Equivalents at the End of the Period	10,317	9,279
Supplemental Disclosures:
Income taxes paid (refunded)	356	(94)
Interest paid	$ 2,183	$ 2,147