Annual report pursuant to Section 13 and 15(d)

Supplemental Information On Oil And Gas Exploration And Production Activities (Results Of Operations For Producing Activities) (Details)

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Supplemental Information On Oil And Gas Exploration And Production Activities (Results Of Operations For Producing Activities) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Supplemental Information On Oil And Gas Exploration And Production Activities [Abstract]      
Revenues $ 228,953,000 $ 127,636,000 $ 85,576,000
Production costs (47,230,000) (31,580,000) (26,113,000)
Depletion (61,965,000) (38,600,000) (28,939,000)
Income before income taxes 119,758,000 57,456,000 30,524,000
Current 282,000 40,000 28,000
Deferred (372,000)      
Income tax expense (benefit) (90,000) 40,000 28,000
Results of operations from producing activities 119,848,000 57,416,000 30,496,000
Depletion per barrel of oil equivalent (BOE) $ 26.56 $ 19.54 $ 17.25