Income Taxes - Summary of Consolidated Provision for Income Taxes (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of consolidated Federal income tax return
Current federal income tax provision	$ 15,731,258	$ 24,749,832	$ 24,234,050
Current state and local income tax provision	8,560,479	1,774,395	1,964,273
Deferred income tax expense (benefit)	(5,622,396)	2,893,063	469,312
Provision for income taxes	$ 18,669,341	$ 29,417,290	$ 26,667,635

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration