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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Nov. 30, 2011
Barnett Shale [Member]
Dec. 31, 2009
Barnett Shale [Member]
Dec. 31, 2011
Proved Oil And Gas Properties [Member]
Dec. 31, 2010
Proved Oil And Gas Properties [Member]
Dec. 31, 2009
Proved Oil And Gas Properties [Member]
Dec. 31, 2011
Unproved Oil And Gas Properties [Member]
Dec. 31, 2010
Unproved Oil And Gas Properties [Member]
Dec. 31, 2009
Unproved Oil And Gas Properties [Member]
Dec. 31, 2011
2012 [Member]
Dec. 31, 2011
2013 [Member]
Proceeds from sale of property $ 2,202,000   $ 1,507,000 $ 2,200,000 $ 1,500,000                
Gain (loss) on sale of properties (207,000)   1,455,000 (200,000) 1,400,000                
US Results of Operations, Impairment of Oil and Gas Properties 3,610,000 11,967,000 6,233,000     0 0 800,000 3,600,000 12,000,000 5,400,000    
Capitalized interest costs 3,100,000 0                      
Estimated life of assets, minimum (years) 3                        
Estimated life of assets, maximum (years) 5                        
Past-due receivables from counterparties 0                        
Contractual commodity derivative volume, percent                       96.00% 46.00%
Restricted stock awards vesting period three                        
Excess tax deduction related to stock compensation $ 800,000