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Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Weighted-Average Exercise Price		$ 544.98
Weighted-average grant date fair value		$ 135.98
Stock-based compensation expense	$ 34,340		$ 19,243	$ 61,997	$ 34,898
Stock-based compensation expense, net of tax	21,147		11,704	38,178	21,225
Stock only stock appreciation rights (SOSARs) granted		757
Basic earnings per share	$ 3.55		$ 2.84	$ 6.23	$ 5.31
Diluted earnings per share	$ 3.50		$ 2.82	$ 6.14	$ 5.27
SOSARs exercised				200
SOSARs forfeited				26
Non-vested stock awards vested				2
Performance SOSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock only stock appreciation rights (SOSARs) granted		220
Leasehold Improvements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation recognized as capitalized development	298		297	596	565
Cumulative Adjustment [Member] | Performance Shares [Member] | Non-Vested Stock Awards Subject to Performance Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,616
Stock-based compensation expense, net of tax	$ 995
Basic earnings per share	$ (0.03)
Diluted earnings per share	$ (0.03)
First Half Vested [Member] | Stock Options And SOSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for SOSARs				2 years
Second Half Vested [Member] | Stock Options And SOSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for SOSARs				3 years

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Represents the expense 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.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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