Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Basic Earnings Per Share
Net income		$ 113,450,870	$ 89,505,801
Less: Dividends and undistributed earnings allocated to participating securities		1,671,188	1,221,016
Net Income available to common shareholders		$ 111,779,682	$ 88,284,785
Basic weighted average shares outstanding		239,559,370	246,309,869
Net (Loss) Income per share - Basic (in dollars per share)	[1]	$ 0.47	$ 0.36
Earnings Per Share, Diluted [Abstract]
Allocation of Net Income used in basic computation		$ 111,779,682	$ 88,284,785
Reallocation of undistributed earnings		10,883	4,184
Net Income available to common shareholders - Diluted		$ 111,790,565	$ 88,288,969
Number of shares used in basic computation		239,559,370	246,309,869
Additional weighted average dilutive common stock equivalents (in shares)		2,133,781	1,306,574
Diluted weighted average shares outstanding		241,693,151	247,616,443
Net Income per share - Diluted (in dollars per share)	[1]	$ 0.46	$ 0.36
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive		271,383	177,966

[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.