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Income Taxes - Reconciliation of Income Tax Expense to Federal Statutory Rate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of reconciliation of income tax expense
Income tax computed at statutory rate	$ 13,646,583	$ 28,356,636	$ 25,641,618
Expense (benefit) attributable to redeemable noncontrolling interests	222,624	(564,449)	(189,773)
State and local income taxes, net of federal benefit	2,993,730	1,153,357	1,276,777
Change in uncertain state and local tax positions, net of federal benefit	2,982,337	0	0
Revaluation adjustment of net deferred tax assets	(917,288)	3,557,039	0
Excess tax benefits on vesting of Restricted Stock	(667,697)	(2,420,250)	0
Income tax benefit from dividends paid on Restricted Stock	(340,200)	(418,583)	0
Interest and Penalties	786,711	0	15,748
Other	(37,459)	(246,460)	(76,735)
Provision for income taxes	$ 18,669,341	$ 29,417,290	$ 26,667,635

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost.

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