Stock-Based Compensation Plans (Schedule Of Total Stock Option And Award Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding at January 1, 2014	1,768,174
Number of Options, Granted	422,750	410,800	392,274
Number of Options, Exercised/Vested	(611,786)
Number of Options, Canceled/Forfeited	(15,263)
Number of Options, Outstanding at December 31, 2015	1,563,875	1,768,174
Number of Options, Vested and expected to vest at December 31, 2015	1,563,875
Number of Options, Exercisable at December 31, 2015	768,261
Weighted Average Exercise Price, Outstanding at January 1, 2014	$ 73.14
Weighted Average Exercise Price, Granted	157.36
Weighted Average Exercise Price, Exercised/Vested	62.03
Weighted Average Exercise Price, Canceled/Forfeited	89.64
Weighted Average Exercise Price, Outstanding at December 31, 2015	100.09	$ 73.14
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2015	100.09
Weighted Average Exercise Price, Exercisable at December 31, 2015	$ 70.41
Weighted Average Remaining Contractual Life (Years), Outstanding at December 31, 2015	6 years 3 months 18 days
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest at December 31, 2015	6 years 3 months 18 days
Weighted Average Remaining Contractual Life (Years), Exercisable at December 31, 2015	6 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding at December 31, 2015	$ 82,056
Aggregate Intrinsic Value, Vested and dxpected to vest at December 31, 2015	82,056
Aggregate Intrinsic Value, Exercisable at December 31, 2015	$ 61,756
Weighted Average Grant-Date Price, Granted	$ 121.75	$ 88.48	$ 77.13
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards, Outstanding at January 1, 2014	140,510
Number of Awards, Granted	36,987
Number of Awards, Exercised/Vested	(80,011)
Number of Awards, Canceled/ Forfeited	(754)
Number of Awards, Outstanding at December 31, 2015	96,732	140,510
Number of Awards, Vested and expected to vest at December 31, 2015	96,732
Weighted Average Grant-Date Price, Outstanding at January 1, 2014	$ 67.71
Weighted Average Grant-Date Price, Granted	121.75
Weighted Average Grant-Date Price, Exercised/Vested	68.36
Weighted Average Grant-Date Price, Canceled/Forfeited	79.50
Weighted Average Grant-Date Price, Outstanding at December 31, 2015	87.75	$ 67.71
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2015	$ 87.75
PSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Nonvested Target Units, Outstanding at January 1, 2014	56,699
Number of Nonvested Target Units, Granted	21,522
Number of Nonvested Target Units, Canceled/Forfeited	(1,845)
Number of Nonvested Target Units, Outstanding at December 31, 2015	76,376	56,699
Number of Nonvested Target Units, Vested and expected to vest at December 31, 2015	127,061
Weighted Average Grant-Date Price, Outstanding at January 1, 2014	$ 81.91
Weighted Average Grant-Date Price, Granted	127.85
Weighted Average Grant-Date Price, Canceled/Forfeited	98.56
Weighted Average Grant-Date Price, Outstanding at December 31, 2015	94.45	$ 81.91
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2015	$ 97.68

Number of Awards, Vested and expected to vest

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Number of non-option equity instruments exercised by participants.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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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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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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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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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 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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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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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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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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Weighted average remaining contractual term for fully vested and expected to vest options that are 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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Number of share options (or share units) exercised during the current period.

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