Stock-Based Compensation (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Y	Dec. 31, 2010
Summary of information about stock options outstanding
Weighted Average Remaining Contractual Life (In years), Outstanding	6.4
Weighted Average Exercise Price Per Option, Outstanding	$ 68.94
Weighted Average Remaining Contractual Life (In years), Exercisable	5.5
Weighted Average Exercise Price Per Option, Exercisable	$ 55.56
Number of Options, Total outstanding	9,432	10,902
Number of Options, Total Exercisable	6,681
14.79 - 16.78 [Member]
Summary of information about stock options outstanding
Number of Options, Outstanding	3
Weighted Average Remaining Contractual Life (In years), Outstanding	1.8
Weighted Average Exercise Price Per Option, Outstanding	$ 15.84
Number of Options, Exercisable	3
Weighted Average Remaining Contractual Life (In years), Exercisable	1.8
Weighted Average Exercise Price Per Option, Exercisable	$ 15.84
22.88 - 33.32 [Member]
Summary of information about stock options outstanding
Number of Options, Outstanding	1,536
Weighted Average Remaining Contractual Life (In years), Outstanding	6.1
Weighted Average Exercise Price Per Option, Outstanding	$ 28.76
Number of Options, Exercisable	1,274
Weighted Average Remaining Contractual Life (In years), Exercisable	5.9
Weighted Average Exercise Price Per Option, Exercisable	$ 28.69
34.45 - 50.94 [Member]
Summary of information about stock options outstanding
Number of Options, Outstanding	2,841
Weighted Average Remaining Contractual Life (In years), Outstanding	7.1
Weighted Average Exercise Price Per Option, Outstanding	$ 43.73
Number of Options, Exercisable	1,578
Weighted Average Remaining Contractual Life (In years), Exercisable	6.3
Weighted Average Exercise Price Per Option, Exercisable	$ 42.10
51.73 - 77.41 [Member]
Summary of information about stock options outstanding
Number of Options, Outstanding	3,930
Weighted Average Remaining Contractual Life (In years), Outstanding	6.6
Weighted Average Exercise Price Per Option, Outstanding	$ 67.14
Number of Options, Exercisable	2,704
Weighted Average Remaining Contractual Life (In years), Exercisable	5.3
Weighted Average Exercise Price Per Option, Exercisable	$ 66.01
77.84 - 86.50 [Member]
Summary of information about stock options outstanding
Number of Options, Outstanding	1,122
Weighted Average Remaining Contractual Life (In years), Outstanding	4.6
Weighted Average Exercise Price Per Option, Outstanding	$ 79.91
Number of Options, Exercisable	1,122
Weighted Average Remaining Contractual Life (In years), Exercisable	4.6
Weighted Average Exercise Price Per Option, Exercisable	$ 79.91

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 weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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