Compensation Plans (Schedule of Stock Option Awards) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Compensation Plans [Abstract]
Options outstanding, December 31, 2013	21,571
Number of shares, granted	4,592
Number of shares, exercised	(7,035)
Number of shares, forfeited	(168)
Number of shares, cancelled	(65)
Options outstanding, December 31, 2014	18,895
Number of shares, exercisable, December 31, 2014	9,251
Weighted average exercise price outstanding, December 31, 2013	$ 41.58
Weighted average exercise price, granted	$ 61.91
Weighted average exercise price, exercised	$ 36.26
Weighted average exercise price, forfeited	$ 55.55
Weighted average exercise price, cancelled	$ 49.47
Weighted average exercise price outstanding, December 31, 2014	$ 48.34
Weighted average exercise price, exercisable, December 31, 2014	$ 41.46
Weighted average remaining contractual term, outstanding, years	4 years 2 months 24 days
Weighted average remaining contractual term, exercisable, years	2 years 11 months 17 days
Aggregate intrinsic value, outstanding	$ 484,341
Aggregate intrinsic value, exercisable	$ 300,498

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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 by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price 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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average price at which grantees could acquire or could have acquired the underlying shares with respect to any other type of change in shares reserved for issuance.

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

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