Stock-Based Compensation (Stock Option Award Activity) (Details) (USD $)	12 Months Ended
Dec. 31, 2011 years
Stock-Based Compensation [Abstract]
Outstanding at December 31, 2010, shares	5,858,924
Granted - at fair market value, shares	265,000
Exercised, shares	(489,324)
Cancelled, shares	(471,344)
Outstanding At December 31, 2011, shares	5,163,256
Outstanding at December 31,2010, Weighted Average Exercise Price	$ 40.72
Granted - at fair market value, Weighted Average Exercise Price	$ 25.07
Exercised, Weighted Average Exercise Price	$ 18.47
Cancelled, Weighted Average Exercise Price	$ 33.42
Outstanding at December 31, 2011, Weighted Average Exercise Price	$ 42.69
Outstanding at December 31, 2011, Weighted Average Remaining Contractual Life (in years)	5.15
Outstanding at December 31, 2011, Aggregate Intrinsic Value

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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

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