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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Development and project costs excluded from amortization | $ 34,600 | $ 53,600
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Preferred stock, shares authorized (in shares) | 50,000,000 | 50,000,000
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 1,800,000,000 | 800,000,000
Common stock, issued (in shares) | 635,584,000 | 485,932,000
Common stock, outstanding (in shares) | 633,471,000 | 484,819,000
8.5% Convertible perpetual preferred stock; 2,650 shares issued and outstanding at December 31, 2015 and 2014; aggregate liquidation preference of $265,000 |  |
Preferred stock, dividend rate, percentage | 8.50% | 8.50%
Preferred stock, shares issued (in shares) | 2,650,000 | 2,650,000
Preferred stock, shares outstanding (in shares) | 2,650,000 | 2,650,000
Preferred stock, aggregate liquidation preference | $ 265,000 | $ 265,000
7.0% Convertible perpetual preferred stock; 2,770 shares issued and outstanding at December 31, 2015, aggregate liquidation preference of $277,000; 3,000 shares issued and outstanding at December 31, 2014, aggregate liquidation preference of $300,000 |  |
Preferred stock, dividend rate, percentage | 7.00% | 7.00%
Preferred stock, shares issued (in shares) | 2,770,000 | 3,000,000
Preferred stock, shares outstanding (in shares) | 2,770,000 | 3,000,000
Preferred stock, aggregate liquidation preference | $ 277,000 | $ 300,000

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- Definition The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to operate and maintain wells and related equipment and facilities, including depreciation and applicable operating costs of support equipment and facilities and other costs of operating and maintaining those wells and related equipment and facilities. They become part of the cost of oil and gas produced. Examples of production costs (sometimes called lifting costs) are: costs of labor to operate the wells and related equipment and facilities; repairs and maintenance; materials, supplies, and fuel consumed and supplies utilized in operating the wells and related equipment and facilities; property taxes and insurance applicable to proved properties and wells and related equipment and facilities; severance taxes; some support equipment or facilities may serve two or more oil and gas producing activities and may also serve transportation, refining, and marketing activities. To the extent that the support equipment and facilities are used in oil and gas producing activities, their depreciation and applicable operating costs become exploration, development or production costs, as appropriate. Depreciation, depletion, and amortization of capitalized acquisition, exploration, and development costs are not production costs but also become part of the cost of oil and gas produced along with production (lifting) costs identified above. + 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=50486907&loc=d3e511914-122862 + Details
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