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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash Flows from Operating Activities:    
Net Income $ 9,220 $ 1,762
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization and accretion on discounted liabilities 13,962 18,031
Gain on sale of properties (706) (233)
Unrealized (gain) loss on derivative instruments, net (5,098) 3,496
Provision for deferred income taxes 4,215 89
Changes in assets and liabilities:    
Increase in accounts receivable (3,533) (235)
(Increase) decrease in other assets 5,037 (176)
Increase (decrease) in accounts payable 1,834 (3,061)
Increase (decrease) in accrued liabilities 863 (187)
Increase (decrease) in due to related parties 287 (37)
Net Cash Provided by Operating Activities 26,081 19,449
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (51,714) (15,773)
Proceeds from sale of properties and equipment 845 233
Net Cash Used in Investing Activities (50,869) (15,540)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (1,935) (1,179)
Purchase of non-controlling interests (47) (169)
Proceeds in long-term bank debt and other long-term obligations 62,000 50,933
Repayment of long-term bank debt and other long-term obligations (34,307) (51,713)
Repayment of indebtedness to related parties   (20,000)
Distribution to non-controlling interest (867) (70)
Net Cash Provided (Used) in Financing Activities 24,844 (22,198)
Net Increase (Decrease) in Cash and Cash Equivalents 56 (18,289)
Cash and Cash Equivalents at the Beginning of the Period 8,661 32,792
Cash and Cash Equivalents at the End of the Period 8,717 14,503
Supplemental Disclosures:    
Income taxes paid during the period 541 1,211
Income tax refunds received during the period   41
Interest paid during the period 1,619 2,350
Increase (decrease) in accrued expenses relating to property during the period $ (1,304) $ 1,979