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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income (loss)		$ 108,958,625	$ 104,280,411	$ 109,023,982	$ 111,248,743	$ 213,239,036	$ 220,272,725
Less: Allocated to participating securities		1,256,243				2,348,020
Net Income available to common shareholders		$ 107,702,382				$ 210,891,016
Basic weighted average shares outstanding (in shares)		255,219,868				256,350,600
Net Income per share - Basic (in dollars per share)	[1]	$ 0.42		$ 0.40		$ 0.82	$ 0.81
Reallocation of undistributed earnings		$ 4,848				$ 8,842
Net Income available to common shareholders - Diluted		$ 107,707,230				$ 210,899,858
Additional weighted average dilutive common stock equivalents (in shares)		1,359,753				1,344,285
Diluted weighted average shares outstanding (in shares)		256,579,621				257,694,885
Diluted (in dollars per share)	[1]	$ 0.42		$ 0.40		$ 0.82	$ 0.80
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive (in shares)		1,013,332				1,011,948
[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.

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