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Consolidated Statement Of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities:    
Net Income $ 821,000 $ 9,675,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Non-controlling interest in earnings of partnerships 941,000 710,000
Depreciation, depletion, amortization and accretion on discounted liabilities 18,031,000 16,929,000
Gain on sale of properties (233,000) (350,000)
Unrealized (gain) loss on derivative instruments 3,496,000 (9,243,000)
Provision for deferred income taxes 89,000 4,557,000
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable (235,000) (488,000)
(Increase) decrease in due from related parties 119,000 (19,000)
(Increase) decrease in inventories 70,000 895,000
(Increase) decrease in prepaid expenses and other assets (246,000) 1,747,000
Increase (decrease) in accounts payable (3,061,000) (1,380,000)
Increase (decrease) in accrued liabilities (187,000) (202,000)
Increase (decrease) in due to related parties (156,000) (37,000)
Net cash provided by operating activities 19,449,000 22,794,000
Cash flows from investing activities:    
Capital expenditures, including exploration expense (15,773,000) (7,861,000)
Proceeds from sale of properties and equipment 233,000 350,000
Net cash used in investing activities (15,540,000) (7,511,000)
Cash flows from financing activities:    
Purchase of stock for treasury (1,179,000) (1,947,000)
Purchase of non-controlling interests (169,000) (1,000)
Increase in long-term bank debt and other long-term obligations 50,933,000 29,517,000
Repayment of long-term bank debt and other long-term obligations (51,713,000) (42,359,000)
Repayment of indebtedness to related parties (20,000,000) 0
Distribution to non-controlling interest (70,000) (818,000)
Net cash used in financing activities (22,198,000) (15,608,000)
Net decrease in cash and cash equivalents (18,289,000) (325,000)
Cash and cash equivalents at the beginning of the period 32,792,000 11,779,000
Cash and cash equivalents at the end of the period 14,503,000 11,454,000
Supplemental disclosures:    
Income taxes paid 1,211,000 77,215
Net income tax refunds received during the year 41,000 0
Interest paid 2,350,000 3,633,000
Change in accrued expenses relating to property $ 1,979,000 $ 1,315,000