Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 360,797,232	$ 347,563,621	$ 424,683,939
Other comprehensive (loss) income before tax:
Foreign currency translation adjustments	151,544	3,153,634	(709,702)
Unrealized (losses) gains on available-for-sale securities, net	(6,424,496)	6,312,051	1,292,325
Other comprehensive (loss) income, before tax	(6,272,952)	9,465,685	582,623
(Benefit) Expense for income taxes related to components of other comprehensive (loss) income	(1,349,144)	1,325,530	271,388
Other comprehensive (loss) income, net of tax	(4,923,808)	8,140,155	311,235
Comprehensive income	$ 355,873,424	$ 355,703,776	$ 424,995,174