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
Mar. 31, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Oil and natural gas properties and equipment - full cost method, amount excluded from amortization $ 110,704 $ 109,824
Preferred stock, par value $ 0.00001 $ 0.00001
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, issued 0 0
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 118,330,000 118,330,000
Common stock, issued 78,805,904 78,768,588
Common stock, outstanding 75,936,731 75,899,415