Compensation Plans (Schedule of Stock Option Awards) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Compensation Plans [Abstract]
Options outstanding, December 31, 2011	45,046
Number of shares, granted	4,728
Number of shares, exercised	(12,995)
Number of shares, forfeited	(135)
Number of shares, cancelled	(3,285)
Options outstanding, December 31, 2012	33,359
Number of shares, exercisable, December 31, 2012	24,254
Weighted average exercise price outstanding, December 31, 2011	$ 38.40
Weighted average exercise price, granted	$ 51.77
Weighted average exercise price, exercised	$ 38.21
Weighted average exercise price, forfeited	$ 46.92
Weighted average exercise price, cancelled	$ 44.57
Weighted average exercise price outstanding, December 31, 2012	$ 39.70
Weighted average exercise price, exercisable, December 31, 2012	$ 36.68
Weighted average remaining contractual term, outstanding, years	3 years 0 months 11 days
Weighted average remaining contractual term, exercisable, years	2 years 1 month 24 days
Aggregate intrinsic value, outstanding	$ 258,455
Aggregate intrinsic value, exercisable	$ 235,063

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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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 vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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

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The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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