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Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash Flows from Operating Activities:    
Net income $ 14,774 $ 6,675
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 23,269 48,400
Gain on sale of properties (730) (1,602)
Unrealized (gain) loss on derivative instruments (3,483) 914
Provision for deferred income taxes 6,970 718
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable 3,294 (3,758)
(Increase) decrease in due from related parties (25) 123
(Increase) decrease in inventories (2) 338
(Increase) decrease in prepaid expenses and other assets 5,761 (5,899)
Decrease in accounts payable (9,500) (3,849)
Decrease in accrued liabilities (616) (438)
Decrease in due to related parties   (283)
Net Cash Provided by Operating Activities 39,712 41,339
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (86,305) (39,951)
Proceeds from sale of properties and equipment 881 1,878
Net Cash Used in Investing Activities (85,424) (38,073)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (4,993) (2,224)
Purchase of non-controlling interests (149) (221)
Increase in long-term bank debt and other long-term obligations 111,800 81,631
Repayment of long-term bank debt and other long-term obligations (59,857) (85,019)
Repayment of indebtedness to related party   (20,000)
Distribution to non-controlling interest (1,148) (1,564)
Net Cash Provided (Used) in Financing Activities 45,653 (27,397)
Net Decrease in Cash and Cash Equivalents (59) (24,131)
Cash and Cash Equivalents at the Beginning of the Year 8,661 32,792
Cash and Cash Equivalents at the End of the Year 8,602 8,661
Supplemental Disclosures:    
Income taxes paid during the year 536 1,122
Net income tax refunds received during the year   41
Interest paid during the year $ 2,534 $ 4,033