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Common Stock and Class B Common Stock Preferred Share Purchase Rights (Details) (USD $)	Sep. 30, 2012
Class of Warrant or Right [Line Items]
Preferred Share Purchase Rights- Exercise Price	$ 150
Preferred Stock, Redemption Price Per Share	$ 0.001
2008 And After [Member]
Class of Warrant or Right [Line Items]
Beneficial OwnershipThreshold	25.00%
Beneficial Ownership Threshold	15.00%
Beneficial Ownership Percentage- Upper Limit	50.00%
Prior To 2008 [Member]
Class of Warrant or Right [Line Items]
Beneficial OwnershipThreshold	20.00%

The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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