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Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Currently payable:      
Federal $ 95,285,094 $ 76,507,760 $ 63,307,583
State 3,259,000 2,450,000 1,663,000
Foreign 1,353,000 1,238,000 850,000
Total 99,897,094 80,195,760 65,820,583
Net deferred:      
Primarily federal 5,237,000 843,000 13,943,000
Provision for income taxes $ 105,134,094 $ 81,038,760 $ 79,763,583