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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, par value $ 0.01 $ 0.01
Unevaluated costs of oil and gas properties $ 291,147 $ 307,267
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 183,685,021 179,015,118
Treasury stock, shares 6,545,651 5,921,102