Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Currently payable:
Federal	$ 83,010,387	$ 133,166,194	$ 136,124,497
State	3,743,781	3,984,000	3,805,000
Foreign	1,776,837	2,440,000	540,000
Total	88,531,005	139,590,194	140,469,497
Deferred income tax (benefit) expense:
Primarily federal	(4,367,155)	(14,585,412)	22,500,000
Provision for income taxes	$ 84,163,850	$ 125,004,782	$ 162,969,497