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Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock only stock appreciation rights (SOSARs) granted	322us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Weighted-average grant date fair value	$ 158.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Granted, Weighted-Average Exercise Price	$ 667.93us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
SOSARs exercised	119us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
SOSARs forfeited	9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Stock-based compensation expense	$ 16,561us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	$ 27,657us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
Stock-based compensation expense, net of tax	10,213us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	17,012us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Stock Options And SOSARs [Member] | First Half Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for SOSARs	2 years
Stock Options And SOSARs [Member] | Second Half Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for SOSARs	3 years
Leasehold Improvements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation recognized as capitalized development	$ 425us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_LeaseholdImprovementsMember	$ 298us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_LeaseholdImprovementsMember

X

- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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X

- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

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- Definition

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

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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-Number 210

-Section 02

-Paragraph 29, 30

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