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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash Flows from Operating Activities:    
Net income (loss) $ 1,323 $ (2,382)
Adjustments to reconcile net income (loss)to net cash provided by operating activities:    
Non-controlling interest in earnings of partnerships 338 473
Depreciation, depletion, amortization and accretion on discounted liabilities 6,838 6,036
Gain on sale of properties (704) (222)
Unrealized loss on derivative instruments, net 3,779 9,509
Provision (benefit) for deferred income taxes 465 (1,395)
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable 2,211 (2,436)
Decrease in other assets 328 59
Decrease in accounts payable (5,426) (4,432)
Increase (decrease) in accrued liabilities 159 (1,083)
Increase in due to related parties 966 592
Net Cash Provided by Operating Activities 10,277 4,719
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (20,701) (5,873)
Proceeds from sale of properties and equipment 734 222
Net Cash Used in Investing Activities (19,967) (5,651)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (456) (959)
Purchase of non-controlling interests (22) (124)
Proceeds in long-term bank debt and other long-term obligations 33,750 19,000
Repayment of long-term bank debt and other long-term obligations (19,307) (24,107)
Repayment of indebtedness to related party   (4,000)
Distribution to non-controlling interests (81) (70)
Net Cash Provided (Used) in Financing Activities 13,884 (10,260)
Net Increase (Decrease) in Cash and Cash Equivalents 4,194 (11,192)
Cash and Cash Equivalents at the Beginning of the Period 8,661 32,792
Cash and Cash Equivalents at the End of the Period 12,855 21,600
Supplemental Disclosures:    
Income taxes paid during the period 450 946
Income tax refunds received during the period   4
Interest paid during the period 673 1,211
Increase (decrease) in accrued expenses relating to property during the period $ (2,104) $ 1,979