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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash Flows from Operating Activities:    
Net income $ 8,922 $ 9,220
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 11,152 13,962
Gain on sale of properties (1,759) (706)
Unrealized gain on derivative instruments, net (2,397) (5,098)
Provision for deferred income taxes 4,374 4,215
Changes in assets and liabilities:    
Increase in accounts receivable (4,707) (3,533)
Decrease in other assets 93 5,037
Increase (decrease) in accounts payable (1,091) 1,834
Increase in accrued liabilities 2,239 863
Increase in due to related parties 49 287
Net Cash Provided by Operating Activities 16,875 26,081
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (14,815) (51,714)
Proceeds from sale of property and equipment 2,147 845
Net Cash Used in Investing Activities (12,668) (50,869)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (2,734) (1,935)
Purchase of non-controlling interests (7) (47)
Proceeds in long-term bank debt and other long-term obligations 27,250 62,000
Repayment of long-term bank debt and other long-term obligations (28,000) (34,307)
Distribution to non-controlling interests (39) (867)
Net Cash Provided by (Used in) in Financing Activities (3,530) 24,844
Net Increase in Cash and Cash Equivalents 677 56
Cash and Cash Equivalents at the Beginning of the Period 8,602 8,661
Cash and Cash Equivalents at the End of the Period 9,279 8,717
Supplemental Disclosures:    
Income taxes paid (refunded) (94) 541
Interest paid $ 2,147 $ 1,619