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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash Flows from Operating Activities:    
Net Income $ 3,769 $ 2,364
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 5,353 4,883
Gain on sale of properties (3,173) (1,060)
Unrealized loss on derivative instruments, net 1,982 2,083
Provision for deferred income taxes 1,251 1,063
Changes in assets and liabilities:    
Increase in accounts receivable (171) (354)
Decrease in other assets 191 115
Increase in accounts payable 1,141 2,225
Increase in accrued liabilities 653 86
Increase in due to related parties 134 2
Net Cash Provided by Operating Activities 11,130 11,407
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (7,864) (11,520)
Proceeds from sale of properties and equipment 3,283 1,182
Net Cash Used in Investing Activities (4,581) (10,338)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (1,046) (1,625)
Purchase of non-controlling interests (48) (1)
Proceeds from long-term bank debt and other long-term obligations 14,750 15,500
Repayment of long-term bank debt and other long-term obligations (19,211) (15,500)
Distribution to non-controlling interests (34) (39)
Net Cash Used in Financing Activities (5,589) (1,665)
Net Increase (Decrease) in Cash and Cash Equivalents 960 (596)
Cash and Cash Equivalents at the Beginning of the Period 9,526 8,602
Cash and Cash Equivalents at the End of the Period 10,486 8,006
Supplemental Disclosures:    
Income taxes paid 293 48
Interest paid $ 1,117 $ 1,068