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Stockholders' Equity (Narrative) (Details) (USD $)	Dec. 17, 2010	May 16, 2005
Stockholders' Equity Note [Abstract]
Additional repurchase of stock authorized, shares (shares)	25,000,000
Repurchase of stock authorized, shares (shares)	162,400,000
Right to purchase Series A Participating Cumulative Preferred Stock (shares)		0.001
Participating cumulative preferred stock at purchase price (dollars per share)		$ 120
Rights are exercisable and not transferable to common stock (percentage)		15.00%
Percentage of acquisition for tender offer of common stock (percentage)		15.00%
Common stock of value equal to number of times the exercise price		2
Rights are redeemed and expired		May 25, 2015

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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