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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash Flows from Operating Activities:    
Net income $ 2,364 $ 1,661
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 4,883 6,838
Gain on sale of properties (1,060) (704)
Unrealized loss on derivative instruments, net 2,083 3,779
Provision for deferred income taxes 1,063 465
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable (354) 2,211
Decrease in other assets 115 328
Increase (decrease) in accounts payable 2,225 (5,426)
Increase in accrued liabilities 86 159
Increase in due to related parties 2 966
Net Cash Provided by Operating Activities 11,407 10,277
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (11,520) (20,701)
Proceeds from sale of properties and equipment 1,182 734
Net Cash Used in Investing Activities (10,338) (19,967)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (1,625) (456)
Purchase of non-controlling interests (1) (22)
Proceeds in long-term bank debt and other long-term obligations 15,500 33,750
Repayment of long-term bank debt and other long-term obligations (15,500) (19,307)
Distribution to non-controlling interests (39) (81)
Net Cash Provided by (Used in) in Financing Activities (1,665) 13,884
Net Increase (Decrease) in Cash and Cash Equivalents (596) 4,194
Cash and Cash Equivalents at the Beginning of the Period 8,602 8,661
Cash and Cash Equivalents at the End of the Period 8,006 12,855
Supplemental Disclosures:    
Income taxes paid 48 450
Interest paid $ 1,068 $ 673