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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Oil and Gas Exploration and Production Industries Disclosures [Abstract]      
Revenues $ 248,601,000 $ 228,953,000 $ 127,636,000
Production costs (53,708,000) (47,230,000) (31,580,000)
Depletion (90,230,000) (61,965,000) (38,600,000)
Income before income taxes (benefit) 104,663,000 119,758,000 57,456,000
Current 730,000 282,000 40,000
Deferred 25,633,000 (372,000) 0
Income tax expense (benefit) 26,363,000 (90,000) 40,000
Results of operations from producing activities 78,300,000 119,848,000 57,416,000
Depletion per barrel of oil equivalent (BOE) $ 35.07 $ 26.56 $ 19.54