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Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Currently payable, Federal $ 63,307,583 $ 54,032,045 $ 31,377,218
Currently payable, State 1,663,000 789,000 896,000
Currently payable, Foreign 850,000 494,000 131,000
Currently payable, Total 65,820,583 55,315,045 32,404,218
Net deferred, Primarily federal 13,943,000 10,391,000 (689,000)
Provision for income taxes $ 79,763,583 $ 65,706,045 $ 31,715,218