Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Consolidated Balance Sheets [Abstract]    
Capitalized costs of oil and natural gas properties excluded from amortization $ 175,587,000 $ 138,623,000
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, dividend rate, percentage 12.00% 12.00%
12% cumulative preferred stock, shares authorized 30,000 30,000
Preferred stock Series A, issued 0 0
Preferred stock Series A, outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 55,649,717 55,621,371
Common stock, shares outstanding 55,649,717 55,621,371