Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

v3.5.0.2
Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Statement Of Financial Position [Abstract]    
Oil and natural gas properties and equipment - full cost method, amount excluded from amortization $ 5,267 $ 18,595
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 79,504,130 79,375,662
Common stock, outstanding 76,634,957 76,506,489
Treasury stock, shares 2,869,173 2,869,173