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Shareholders' Equity (Common Stock Dividends, Non-Vested Stock And Stock Options) (Details) (USD $)
In Thousands, except Share data
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2011
Jul. 29, 2011
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Cash dividends paid per share of Common and Class B stock   $ 0.57 $ 0.57 $ 0.52 $ 1.09 $ 1.00
Cash dividend, declaration date Jul. 01, 2011       Jul. 01, 2011  
Date cash dividend paid         Jul. 29, 2011  
Date of record for cash dividend         Jul. 15, 2011  
Shares of non-vested restricted stock granted     22,750   414,602 132,500
Stock delivered as payment to satisfy tax withholdings, shares     2,527 258 2,527 5,111
Stock delivered as payment to satisfy tax withholdings, market value     $ 180 $ 16 $ 180 $ 293
Stock options exercised for Common and Class B common stock, value     228 366 2,635 2,808
Class B Common Stock [Member]
            
Stock delivered as payment to satisfy tax withholdings, shares           48,938
Stock delivered as payment to satisfy tax withholdings, market value           $ 2,814
Stock options exercised for Common and Class B common stock, shares     6,500 13,000 72,300 174,850