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Shareholders' Equity (Common Stock Dividends, Non-Vested Stock And Stock Options) (Details) (USD $)
In Thousands, except Share data
0 Months Ended3 Months Ended9 Months Ended
Oct. 31, 2011
Oct. 19, 2011
Oct. 14, 2011
Oct. 03, 2011
Oct. 03, 2011
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Disclosure Equity Components [Line Items]         
Cash dividends paid per share of Common and Class B stock $ 0.62  $ 0.57$ 0.57$ 0.52$ 1.66$ 1.52
Cash dividend, declaration date   Oct. 03, 2011     
Date cash dividend paidOct. 31, 2011        
Date of record for cash dividend  Oct. 14, 2011      
Shares of non-vested restricted stock granted     15,000 429,602135,000
Stock delivered as payment to satisfy tax withholdings, shares      14,5672,52719,678
Stock delivered as payment to satisfy tax withholdings, market value      $ 862$ 180$ 1,155
Class B Common Stock [Member]
         
Disclosure Equity Components [Line Items]         
Stock delivered as payment to satisfy tax withholdings, shares        48,938
Stock delivered as payment to satisfy tax withholdings, market value        2,814
Common Stock [Member]
         
Disclosure Equity Components [Line Items]         
Stock options exercised, shares     3,4507,250  
Common And Class B Common Stock [Member]
         
Disclosure Equity Components [Line Items]         
Stock options exercised, shares       75,750182,100
Stock options exercised, value     $ 80$ 355$ 2,715$ 3,163