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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Statement of Financial Position [Abstract] |  |
Capitalized costs of oil and natural gas properties excluded from amortization | $ 199,598 | $ 138,623
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 | 55,687,845 | 55,621,371
Common stock, shares outstanding | 55,687,845 | 55,621,371

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- Definition The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=6949603&loc=d3e511914-122862 + Details
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