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Stock-based Compensation (Details)	12 Months Ended
Stock-based Compensation (Details)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(42,400)
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(42,400)	(46,230)	(55,300)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	(177,271)	(186,198)	(156,300)

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.

+ References+ Details

- Definition

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

+ References+ Details