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Stockholders' Equity (Common Stock Reserved For Issuance Upon Exercise Of Stock Options) (Details) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	45,654	45,223
Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	450	450

- Definition

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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