Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic Earnings Per Share
Net income		$ 72,655,995	$ 76,660,548	$ 232,589,023	$ 276,617,836
Less: Dividends and undistributed earnings allocated to participating securities		1,096,274	1,240,581	3,563,605	4,240,503
Net Income available to common shareholders		$ 71,559,721	$ 75,419,967	$ 229,025,418	$ 272,377,333
Basic weighted average shares outstanding		231,316,879	234,005,573	231,072,421	236,628,999
Net income per share - Basic (in dollars per share)	[1]	$ 0.31	$ 0.32	$ 0.99	$ 1.15
Diluted Earnings Per Share
Allocation of Net Income used in basic computation		$ 71,559,721	$ 75,419,967	$ 229,025,418	$ 272,377,333
Reallocation of undistributed earnings		848	2,943	4,412	13,289
Net Income available to common shareholders - Diluted		$ 71,560,569	$ 75,422,910	$ 229,029,830	$ 272,390,622
Number of shares used in basic computation		231,316,879	234,005,573	231,072,421	236,628,999
Additional weighted average dilutive common stock equivalents (in shares)		300,138	897,636	457,032	1,108,216
Diluted weighted average shares outstanding		231,617,017	234,903,209	231,529,453	237,737,215
Net Income per share - Diluted (in dollars per share)	[1]	$ 0.31	$ 0.32	$ 0.99	$ 1.15
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive		2,456,463	987,757	1,526,986	180,669

[1] (1) Earnings Per Share has been adjusted to exclude the portion of net income allocated to participating securities as a result of share-based payment awards.