Annual report pursuant to Section 13 and 15(d)

Supplemental Information On Oil And Gas Exploration And Production Activities (Narrative) (Details)

v2.4.0.6
Supplemental Information On Oil And Gas Exploration And Production Activities (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Supplemental Information On Oil And Gas Exploration And Production Activities [Abstract]            
Price per barrel       $ 96.19 $ 76.16 $ 57.90
Price per MMbtu       4.12 4.38 3.87
Future development costs estimated to be spent in 2012     52,855,000      
Future development costs estimated to be spent in 2013   49,897,000        
Future development costs estimated to be spent in 2014 $ 55,364,000