Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Parenthetical) (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	[1]	$ 40,533,279	$ 42,700,978	$ 177,564,538	$ 143,742,500

[1] Net income for the three months ended September 30, 2018 and 2017 was $40,533,279 and $42,700,978, respectively, and for the nine months ended September 30, 2018 and 2017 was $177,564,538 and $143,742,500, respectively.