Accounting for Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) (Employee Stock Option [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, shares	7,104,113
Exercised, Shares	(2,248,891)
Forfeited and Cancelled, Shares	(20,010)
Ending Balance, shares	4,835,212
Beginning of Period, Weighted Average Exercise Price	$ 34.25
Exercised, Weighted Average Exercise Price	$ 32.53
Forfeited and Cancelled, Weighted Average Exercise Price	$ 35.93
End of Period, Weighted Average Exercise Price	$ 34.98
Weighted Average Remaining Contractual Term	4 years 7 months 6 days
Aggregate Intrinsic Value	$ 60,000
Exercisable, Shares	4,166,134
Exercisable, Weighted Average Exercise Price	$ 35.67
Exercisable, Weighted Average Remaining Contractual Term	4 years
Exercisable, Aggregate Intrinsic Value	$ 48,825

Accounting for Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) (Employee Stock Option [Member], USD $)
In Thousands, except Share data, unless otherwise specified

3 Months Ended

Mar. 31, 2013

Employee Stock Option [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Beginning Balance, shares

7,104,113

Exercised, Shares

(2,248,891)

Forfeited and Cancelled, Shares

(20,010)

Ending Balance, shares

4,835,212

Beginning of Period, Weighted Average Exercise Price

$ 34.25

Exercised, Weighted Average Exercise Price

$ 32.53

Forfeited and Cancelled, Weighted Average Exercise Price

$ 35.93

End of Period, Weighted Average Exercise Price

$ 34.98

Weighted Average Remaining Contractual Term

4 years 7 months 6 days

Aggregate Intrinsic Value

$ 60,000

Exercisable, Shares

4,166,134

Exercisable, Weighted Average Exercise Price

$ 35.67

Exercisable, Weighted Average Remaining Contractual Term

4 years

Exercisable, Aggregate Intrinsic Value

$ 48,825

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