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Common Stock (Schedule Of Information About All Outstanding Options And Exercisable Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Common Stock [Abstract]
Number, Options Outstanding	7,558,945	6,594,950	8,802,450	8,116,326
Weighted average exercise price, Options Outstanding	$ 31.63	$ 25.16	$ 25.03	$ 22.68
Aggregate intrinsic value, Options Outstanding	$ 67,870,455
Weighted average remaining contractual life, Options Outstanding	2.8
Number, Options Exercisable	2,979,945
Weighted Average Exercise Price, Options Exercisable	$ 23.82
Aggregate intrinsic value, Options Exercisable	$ 44,833,019
Weighted average remaining contractual life, Options Exercisable	1.8

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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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 total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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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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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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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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