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Acquisitions and Divestitures (Details) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Class A
Dec. 31, 2010
Class A
Mar. 31, 2011
Permian Basin Acquisitions
Dec. 31, 2010
Permian Basin Acquisitions
property
Jan. 31, 2010
Permian Basin Acquisitions
Class A
May 31, 2011
Wolfberry Acquisition
acre
Dec. 31, 2011
Wolfberry Acquisition
Dec. 31, 2009
Denver Julesburg
Dec. 31, 2011
Senior Notes 6.75 Percent Due 2020
Dec. 31, 2010
Senior Notes 6.75 Percent Due 2020
Nov. 01, 2010
Senior Notes 6.75 Percent Due 2020
Unsecured Debt
Nov. 01, 2010
Senior Notes 6.75 Percent Due 2020
Unsecured Debt
Permian Basin Acquisitions
Acquisitions                              
Interests acquired in producing properties (in net acres)                 6,000            
Purchase price paid, net of customary post-closing adjustments $ 158,090,000 $ 334,409,000 $ 13,497,000       $ 327,032,000   $ 128,398,000            
Percentage of operation of acquired properties (as a percent)                   98.00%          
Percentage of average working interest (as a percent)                   93.00%          
Percentage of net revenue interest (as a percent)                   70.00%          
Revenues generated by acquired properties 870,773,000 619,608,000 500,532,000       28,700,000     7,800,000          
Recognized amounts of identifiable assets acquired and liabilities assumed:                              
Proved developed and undeveloped properties             332,214,000   128,697,000            
Other assets acquired             342,000                
Asset retirement obligation             (3,498,000)   (119,000)            
Deferred income tax liability             (647,000)                
Other liabilities assumed             (333,000)   (180,000)            
Total identifiable net assets             328,078,000   128,398,000            
Number of separate acquisitions (in properties)             3                
Common stock shares issued for financing acquisitions (in shares)       52,067,994 51,426,232     8,000,000              
Aggregate principal amount of senior notes due in November 2020 issued for financing acquisitions 300,000,000 300,000,000                         300,000,000
Interest rate of senior notes due in November 2020 (as a percent)                       6.75% 6.75% 6.75%  
Gain on purchase of oil and natural gas properties           1,000,000                  
Deferred income taxes (149,279,000) 51,735,000 16,734,000     700,000                  
Transaction Costs on Acquisitions 0 2,635,000 0       2,600,000                
Net earnings from discontinued operations $ 0 $ 0 $ 6,806,000               $ 6,806,000