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Capital Stock (Details)	6 Months Ended	12 Months Ended
Capital Stock (Details)	Jun. 30, 2011	Dec. 31, 2010
Capital Stock
Beginning balance	159,909,052	158,118,937
Stock options/SARs exercised	558,161	991,988
Restricted stock grants	326,591	405,127
Treasury shares issued	28,903	12,771
Shares issued for acreage purchases		380,229
Ending balance	160,822,707	159,909,052

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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- Definition

Number of shares of stock issued during the period pursuant to acquisitions.

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- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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- Definition

Number of share options (or share units) exercised during the current period.

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