Significant Accounting Policy Common Stock Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Stock Issued During Period, Shares, New Issues	0	44,275	0
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	894	801	536
Common Stock, Shares, Outstanding	227,056	226,162	181,086	180,550
Stock Issued During Period, Value, New Issues		$ 1,828,862

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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Number of new stock issued during the period.

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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- Definition

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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