Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 72,404,403	$ 86,506,418	$ 159,933,028	$ 199,957,288
Other comprehensive (loss) income before tax:
Foreign currency translation adjustments	(3,131,326)	963,199	(4,027,746)	110,787
Unrealized (losses) gains on debt securities, net	(3,414,108)	1,705,281	(11,209,338)	(3,413,672)
Other comprehensive (loss) income, before tax	(6,545,434)	2,668,480	(15,237,084)	(3,302,885)
Income tax impact related to components of other comprehensive (loss) income	(716,963)	358,109	(2,353,961)	(716,871)
Other comprehensive (loss) income, net of tax	(5,828,471)	2,310,371	(12,883,123)	(2,586,014)
Comprehensive income	$ 66,575,932	$ 88,816,789	$ 147,049,905	$ 197,371,274