2.2.0.7 false Stockholders' equity 0206 - Disclosure - Stockholders' equity true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Stockholders' equity [Abstract] 0 us-gaap_StockholdersEquityNoteAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Stockholders' equity 1 us-gaap_StockholdersEquityNoteDisclosureTextBlock us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0   <div style="font-family: 'Times New Roman',Times,serif"> <div align="left" style="font-size: 10pt; margin-top: 12pt"><b>Note F. </b><b><i>Stockholders’ equity</i></b> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     <b><i>Equity issuance. </i></b>On February 1, 2010, the Company issued 5,347,500 shares of its common stock at $42.75 per share. After deducting underwriting discounts of approximately $9.1 million and transaction costs, the Company received net proceeds of approximately $219.3 million. The net proceeds from this offering were used to repay a portion of the borrowings under the Company’s credit facility. </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     <b><i>Private placement of equity. </i></b>On July 19, 2010, the Company entered into a Common Stock Purchase Agreement (the “Purchase Agreement”) with certain third-party accredited investors (the “Purchasers”) to sell 6,622,517 shares of its common stock at a price of $45.30 per share in a private placement (the “Private Placement”) for aggregate cash consideration of approximately $300 million. Also, the Company entered into a registration rights agreement with the investors. The Company paid approximately $7.3 million in transaction costs, which includes the placement agent fee. The common stock was issued and sold simultaneously with the closing of the acquisition of substantially all of the oil and natural gas properties and related assets owned by Marbob Energy Corporation and certain affiliated entities (collectively, “Marbob”) (the “Marbob Acquisition”) on October 7, 2010 (See Note Q). The Company used the net proceeds to finance a portion of the Marbob Acquisition. </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     <b><i>Treasury stock. </i></b>The restrictions on certain restricted stock awards issued to certain of the Company’s officers, directors and key employees lapsed, and upon the lapse of restrictions these individuals became liable for income taxes on the value of such shares. In accordance with the Company’s 2006 Stock Incentive Plan and the applicable restricted stock award agreements, some of such persons elected to deliver shares of the Company’s common stock to the Company in exchange for cash used to satisfy such tax liability. In total, at September 30, 2010 and December 31, 2009, the Company had acquired 27,044 and 12,380 shares, respectively, that were held as treasury stock in the approximate amounts of $1.2 million and $0.4 million, respectively. </div> </div>  <!-- Begin Block Tagged Note false false false us-types:textBlockItemType textblock Disclosures related to accounts comprising shareholders' equity, including other comprehensive income. Includes: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables; effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure. 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