Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 89,505,801	$ 104,280,411
Other comprehensive income before tax:
Foreign currency translation adjustments	(692,090)	298,999
Unrealized gains on debt securities, net	2,779,730	1,298,236
Other comprehensive income, before tax	2,087,640	1,597,235
Income tax impact related to components of other comprehensive income	583,743	272,631
Other comprehensive income, net of tax	1,503,897	1,324,604
Net current-period change	$ 91,009,698	$ 105,605,015