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Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Currently payable:
Federal	$ 108,689,911us-gaap_CurrentFederalTaxExpenseBenefit	$ 95,285,094us-gaap_CurrentFederalTaxExpenseBenefit	$ 76,507,760us-gaap_CurrentFederalTaxExpenseBenefit
State	2,236,000	3,259,000	2,450,000
Foreign	978,000us-gaap_CurrentForeignTaxExpenseBenefit	1,353,000us-gaap_CurrentForeignTaxExpenseBenefit	1,238,000us-gaap_CurrentForeignTaxExpenseBenefit
Total	111,903,911us-gaap_CurrentIncomeTaxExpenseBenefit	99,897,094us-gaap_CurrentIncomeTaxExpenseBenefit	80,195,760us-gaap_CurrentIncomeTaxExpenseBenefit
Net deferred:
Primarily federal	14,818,000	5,237,000	843,000
Provision for income taxes	$ 126,721,911us-gaap_IncomeTaxExpenseBenefit	$ 105,134,094us-gaap_IncomeTaxExpenseBenefit	$ 81,038,760us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.