Stock Repurchase Programs (Details)	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Stock Repurchase Programs (Textuals) [Abstract]
Vested shares included in treasury stock related to stock awards surrendered for withholding taxes	17,145	34,293
Remaining number of shares to be purchased under existing stock repurchase programs	50,123,550

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