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Earnings Per Share (Narrative) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Diluted earnings per share, excluded shares having anti-dilutive effect 33,511 129,641 217,832
Class B Common Stock [Member]
     
Convertible Class B common stock outstanding 2,846,334 2,858,592 2,844,935