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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash Flows from Operating Activities:    
Net income $ 10,778 $ 6,505
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 19,846 40,930
Gain on sale of properties (720) (1,608)
Unrealizedgainon derivative instruments, net (2,449) (9,015)
Provision for deferred income taxes 4,738 2,114
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable (1,652) 42
(Increase) decrease in other assets 5,476 (24)
Decrease in accounts payable (3,655) (8,078)
Increase in accrued liabilities 605 229
Increase in due to related parties 426 41
Net Cash Provided by Operating Activities 33,393 31,136
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (68,620) (26,913)
Proceeds from sale of properties and equipment 881 1,855
Net Cash Used in Investing Activities (67,739) (25,058)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (2,705) (1,633)
Purchase of non-controlling interests (66) (192)
Proceeds in long-term bank debt and other long-term obligations 85,300 64,831
Repayment of long-term bank debt and other long-term obligations (45,357) (68,134)
Repayment of indebtedness to related party   (20,000)
Distribution to non-controlling interest (867) (694)
Net Cash Provided (Used) in Financing Activities 36,305 (25,822)
Net Increase (Decrease) in Cash and Cash Equivalents 1,959 (19,744)
Cash and Cash Equivalents at the Beginning of the Period 8,661 32,792
Cash and Cash Equivalents at the End of the Period 10,620 13,048
Supplemental Disclosures:    
Income taxes paid during the period 536 1,211
Income tax refunds received during the period   41
Interest paid during the period 2,534 3,400
Increase (decrease) in accrued expenses relating to property during the period $ (1,304) $ 579