Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]    
Oil and natural gas properties and equipment-full cost method, amount excluded from amortization $ 152,077 $ 154,516
Preferred stock, par value $ 0.00001 $ 0.00001
Preferred stock, shares authorized 2,000,000 2,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 118,330,000 118,330,000
Common stock, shares issued 77,220,706 77,220,706
Common stock, shares outstanding 74,351,533 74,351,533