Stock Based Compensation (Summary Of Option And SOSAR Activity Under Incentive Plan) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-Based Compensation [Abstract]
Outstanding, beginning of year, Shares	1,690	1,449	1,486
Outstanding, beginning of year, Weighted-Average Exercise Price	$ 312.44	$ 274.92	$ 157.07
Stock only stock appreciation rights (SOSARs) granted	764	672	617
Granted, Weighted-Average Exercise Price	$ 545.66	$ 320.21	$ 371.70
Stock option and SOSAR exercises (shares)	(315)	(369)	(592)
Exercised, Weighted-Average Exercise Price	$ 310.32	$ 176.23	$ 80.31
Forfeited, Shares	(52)	(62)	(62)
Forfeited, Weighted-Average Exercise Price	$ 419.74	$ 329.76	$ 274.25
Outstanding, end of year, Shares	2,087	1,690	1,449
Outstanding, end of year, Weighted-Average Exercise Price	$ 395.46	$ 312.44	$ 274.92
Outstanding, Weighted-Average Remaining Years of Contractual Life	4 years 10 months 24 days
Outstanding, Aggregate Intrinsic Value	$ 603,356
Vested and expected to vest, Shares	2,039
Vested and expected to vest, Weighted-Average Exercise Price	$ 393.06
Vested and expected to vest, Weighted-Average Remaining Years of Contractual Life	4 years 10 months 24 days
Vested and expected to vest, Aggregate Intrinsic Value	594,198
Exercisable, Shares	482
Exercisable, Weighted-Average Exercise Price	$ 271.38
Exercisable, Weighted-Average Remaining Years of Contractual Life	3 years 2 months 12 days
Exercisable, Aggregate Intrinsic Value	$ 199,045

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

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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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Gross number of share options (or share units) granted during the 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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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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