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Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 108,958,625	$ 109,023,982	$ 213,239,036	$ 220,272,725
Other comprehensive income (loss) before tax:
Foreign currency translation adjustments	(475,686)	(2,465,603)	(176,687)	(839,425)
Unrealized gains on derivatives	0	15,556	0	82,604
Unrealized gains (losses) on debt securities, net	1,583,089	(302,252)	2,881,325	(323,532)
Other comprehensive income (loss), before tax	1,107,403	(2,752,299)	2,704,638	(1,080,353)
Income tax impact related to components of other comprehensive income	332,448	(60,206)	605,079	(50,594)
Other comprehensive income (loss), net of tax	774,955	(2,692,093)	2,099,559	(1,029,759)
Comprehensive Income	$ 109,733,580	$ 106,331,889	$ 215,338,595	$ 219,242,966

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