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Shareholders' Equity (Common Stock Dividends, Non-Vested Stock And Stock Options) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Disclosure Equity Components [Line Items]    
Cash dividends paid per share of Common and Class B common stock $ 0.62 $ 0.52
Shares of non-vested restricted stock granted 58,301 391,852
Common Stock [Member]
    
Disclosure Equity Components [Line Items]    
Stock options exercised, shares 21,500 65,800
Stock options exercised, value $ 987 $ 2,407