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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash Flows from Operating Activities:    
Net income $ 11,540 $ 10,778
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 16,329 19,846
Gain on sale of properties (2,519) (720)
Unrealized (gain) loss on derivative instruments, net 1,472 (2,449)
Provision for deferred income taxes 5,407 4,738
Changes in assets and liabilities:    
Increase in accounts receivable (4,510) (1,652)
Decrease in other assets 253 5,476
Decrease in accounts payable (362) (3,655)
Increase in accrued liabilities 2,988 605
Increase in due to related parties 108 426
Net Cash Provided by Operating Activities 30,706 33,393
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (22,459) (68,620)
Proceeds from sale of property and equipment 2,997 881
Net Cash Used in Investing Activities (19,462) (67,739)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (2,977) (2,705)
Purchase of non-controlling interests (14) (66)
Proceeds from long-term bank debt and other long-term obligations 37,250 85,300
Repayment of long-term bank debt and other long-term obligations (42,401) (45,357)
Distribution to non-controlling interests (182) (867)
Net Cash Provided by (Used in) in Financing Activities (8,324) 36,305
Net Increase in Cash and Cash Equivalents 2,920 1,959
Cash and Cash Equivalents at the Beginning of the Period 8,602 8,661
Cash and Cash Equivalents at the End of the Period 11,522 10,620
Supplemental Disclosures:    
Income taxes paid (refunded) (63) 536
Interest paid $ 3,187 $ 2,534