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Supplemental Information (Details 5) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Revenue:    
Oil and gas sales $ 88,336 $ 96,030
Costs and Expenses:    
Lease operating expenses 39,868 36,897
Exploration costs 10 38
Depreciation and depletion 19,883 42,282
Income tax expense 8,941 3,200
Total Costs and Expenses 68,702 82,417
Results of Operations From Producing Activities (excluding corporate overhead and interest costs) $ 19,634 $ 13,613