Stockbased Compensation Expense (Policies)	12 Months Ended
Dec. 31, 2011
Stock-based Compensation Expense Disclosure [Abstract]
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	The company has stock-based compensation plans for its key employees, directors and others. These plans permit the grant of a variety of stock and stock-based awards, including restricted stock, stock options or performance-based shares, as determined by the compensation committee of the company's Board of Directors or for certain non-officer grants, by the company's employee equity committee, which consists of its chief executive officer. Options granted under these plans generally vest over 3-5 years with terms of 7-10 years, assuming continued employment with certain exceptions. The company's practice is to grant options at fair market value. The company generally issues new shares of its common stock to satisfy option exercises. Grants of stock options and restricted stock on or after November 9, 2006, provide that in the event of both a change in control of the company and a qualifying termination of an option holder's employment, all options and service-based restricted stock awards held by the recipient become immediately vested (unless an employment or other agreement with the employee provides for different treatment). Compensation cost is based on the grant-date fair value and is recognized ratably over the requisite vesting period or to the retirement date for retirement eligible employees, if earlier. The fair value of most option grants is estimated using the Black-Scholes option pricing model. For option grants that require the achievement of both service and market conditions, a lattice model is used to estimate fair value. The fair value is then amortized on a straight-line basis over the requisite service periods of the awards, which is generally the vesting period. Use of a valuation model requires management to make certain assumptions with respect to selected model inputs. Expected volatility was calculated based on the historical volatility of the company's stock. Historical data on exercise patterns is the basis for estimating the expected life of an option. The risk-free interest rate is based on U.S. Treasury zero-coupon issues with a remaining term which approximates the expected life assumed at the date of grant. The compensation expense recognized for all stock-based awards is net of estimated forfeitures. Forfeitures are estimated based on an analysis of actual option forfeitures. The company has elected to recognize any excess income tax benefits from stock option exercises in capital in excess of par value only if an incremental income tax benefit would be realized after considering all other tax attributes presently available to the company. The company measures the tax benefit associated with excess tax deductions related to stock-based compensation expense by multiplying the excess tax deductions by the statutory tax rates. The company uses the incremental tax benefit approach for utilization of tax attributes. The company awards to a number of key employees restricted company common stock or restricted units that convert into an equivalent number of shares of common stock. The awards generally vest in annual installments over three years, assuming continued employment, with some exceptions. Vesting of the awards is contingent upon meeting certain service conditions and may also be contingent upon meeting certain performance and/or market conditions. The fair market value of the award at the time of the grant is amortized to expense over the period of vesting. Recipients of restricted shares have the right to vote such shares and receive cash dividends, whereas recipients of restricted units have no voting rights but are entitled to receive dividend equivalents. The fair value of service- and performance-based restricted share/unit awards is determined based on the number of shares/units granted and the market value of the company's shares on the grant date. For awards with market-based vesting conditions, the company uses a lattice model to estimate the grant-date fair value of the award.

Stockbased Compensation Expense (Policies)

12 Months Ended

Dec. 31, 2011

Stock-based Compensation Expense Disclosure [Abstract]

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

The company has stock-based compensation plans for its key employees, directors and others. These plans permit the grant of a variety of stock and stock-based awards, including restricted stock, stock options or performance-based shares, as determined by the compensation committee of the company's Board of Directors or for certain non-officer grants, by the company's employee equity committee, which consists of its chief executive officer. Options granted under these plans generally vest over 3-5 years with terms of 7-10 years, assuming continued employment with certain exceptions. The company's practice is to grant options at fair market value. The company generally issues new shares of its common stock to satisfy option exercises. Grants of stock options and restricted stock on or after November 9, 2006, provide that in the event of both a change in control of the company and a qualifying termination of an option holder's employment, all options and service-based restricted stock awards held by the recipient become immediately vested (unless an employment or other agreement with the employee provides for different treatment).

Compensation cost is based on the grant-date fair value and is recognized ratably over the requisite vesting period or to the retirement date for retirement eligible employees, if earlier.

The fair value of most option grants is estimated using the Black-Scholes option pricing model. For option grants that require the achievement of both service and market conditions, a lattice model is used to estimate fair value. The fair value is then amortized on a straight-line basis over the requisite service periods of the awards, which is generally the vesting period. Use of a valuation model requires management to make certain assumptions with respect to selected model inputs. Expected volatility was calculated based on the historical volatility of the company's stock. Historical data on exercise patterns is the basis for estimating the expected life of an option. The risk-free interest rate is based on U.S. Treasury zero-coupon issues with a remaining term which approximates the expected life assumed at the date of grant. The compensation expense recognized for all stock-based awards is net of estimated forfeitures. Forfeitures are estimated based on an analysis of actual option forfeitures.

The company has elected to recognize any excess income tax benefits from stock option exercises in capital in excess of par value only if an incremental income tax benefit would be realized after considering all other tax attributes presently available to the company. The company measures the tax benefit associated with excess tax deductions related to stock-based compensation expense by multiplying the excess tax deductions by the statutory tax rates. The company uses the incremental tax benefit approach for utilization of tax attributes.

The company awards to a number of key employees restricted company common stock or restricted units that convert into an equivalent number of shares of common stock. The awards generally vest in annual installments over three years, assuming continued employment, with some exceptions. Vesting of the awards is contingent upon meeting certain service conditions and may also be contingent upon meeting certain performance and/or market conditions. The fair market value of the award at the time of the grant is amortized to expense over the period of vesting. Recipients of restricted shares have the right to vote such shares and receive cash dividends, whereas recipients of restricted units have no voting rights but are entitled to receive dividend equivalents. The fair value of service- and performance-based restricted share/unit awards is determined based on the number of shares/units granted and the market value of the company's shares on the grant date. For awards with market-based vesting conditions, the company uses a lattice model to estimate the grant-date fair value of the award.

- Definition

Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.

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