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Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Currently payable: |  |  |
Federal | $ 136,124,497 | $ 129,379,597 | $ 108,689,911
State | 3,805,000 | 2,908,000 | 2,236,000
Foreign | 540,000 | 276,000 | 978,000
Total | 140,469,497 | 132,563,597 | 111,903,911
Net deferred: |  |  |
Primarily federal | 22,500,000 | 12,558,000 | 14,818,000
Provision for income taxes | $ 162,969,497 | $ 145,121,597 | $ 126,721,911

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